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New MPPT Board Prototype
Posted by: sjh7132

Video duration: 375 seconds

This is a demonstration of a wind turbine max peak power tracking board that I designed. It has many features that should make it useful as a turbine characterization tool. The firmware in the board is very basic and I will be making improvements in the future.

Related: wind, turbine, mppt, electonics, energy, power, vawt, hawt

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Latest comments made on this video:

Great work, I'm ...
By: Pbeas52. on 09 Feb 12, 03:40:23
Great work, I'm anxious to see the final? product!

I'm impressed with ...
By: middleagebloke. on 27 Jan 12, 08:50:55
I'm impressed with this work. The kids at our local Jaycar.com.au electronics store in Australia seem to think there's no distinction between controllers for solar and windgens. I don't understand your theories fully, but what I'm guessing is that cogging and load would? seriously prevent a turbine from running even if there was enough wind. Is this the same problem with all turbines? Or is it just an issue with the type of generator you're running'? Any suggested links are welcome. Graham

top? notch
By: LOPEZdJUNGLIST. on 25 Jan 12, 22:58:12
top? notch

@sjh7132 WONDERFUL! ...
By: muddymuddymuddmann. on 16 Jan 12, 13:23:07
@sjh7132 WONDERFUL! KEEP UP THE GOOD WORK. I'M LOOKING FORWARDS TO THE DAY I CAN MAKE ONE OF THESE INEFFICIENT CEILING FAN WIND TURBINES PUT OUT WHAT THEY REALLY SHOULD. THEY PUT OUT VOLTAGE WELL, BUT LITTLE AMPS. IN THE MEANTIME, THE BEST OUTPUT I GET IS RUNNING 12? STRANDS OF LED CHRISTMAS LIGHTS. OR 50 TO 100 WATTS TO THE BATTERY BANK. KEEP SMILING AND HAVE A BALL. MUDDy

@sjh7132 thanks for ...
By: roystervi. on 16 Jan 12, 04:42:09
@sjh7132 thanks for the quick response if you want someone to try out ur demo board on a bedini motor let me know. if this board does as describe in the vid the bedini motor would be a great test. thanks? again

@roystervi No, the ...
By: sjh7132. on 16 Jan 12, 04:28:13
@roystervi No, the demo was with the second board made. I'm making a few more to try on wind turbines. I never considered using it with something like a bedini motor, but if there is a? high voltage source, the board should be able to use it.

nice vid... Have ...
By: roystervi. on 16 Jan 12, 03:46:15
nice vid... Have you ever tested ur board on a bedini motor.... I have a bedini motor that I gets 161V and? I can't do nothing with. I try to reduse to 12v dc and try with a an inverter but my motor speed up with load and burn up my invertor. I love to test your board on my motor if this is an option.... email me thanks

@muddymuddymuddmann ...
By: sjh7132. on 15 Jan 12, 16:08:09
@muddymuddymuddmann When I get the 'good' firmware done it should be smart enough to realize that if the turbine just started up, it should slowly ask for? torque to allow the turbine to start.

LOOKS GREAT! CAN ...
By: muddymuddymuddmann. on 15 Jan 12, 12:38:39
LOOKS GREAT! CAN IT? BE ADJUSTED TO ALLOW A NO LOAD THRESHOLD FOR EASY LOW WIND START UP? MUDDy

Hello mr Mr Madguy ...
By: CNGBOB. on 12 Jan 12, 13:04:40
Hello mr Mr Madguy I am the builder of the Mann Smart Drive if you go to my CNGBOB you will see me redoing the controlled test. Steves? controller let me make over 121 Watts in to the grid by one hand. and I show the same test using the top of the line GinLong Grid Tie and only can make 60 Watts. Bob Mann

@MadScientist267 ...
By: sjh7132. on 12 Jan 12, 05:36:18
@MadScientist267 BTW? you can see the rectified alt voltage (before the buck converter) on the meter in the video. It's clearly near 100v.

@MadScientist267 ...
By: sjh7132. on 12 Jan 12, 05:31:06
@MadScientist267 The? alt puts out 1v per RPM, it's easy to crank out 80V because it's only 80 RPM. You must be making a bad assumption in your calculations. If you give me more detail I'll tell you where you went wrong. There is no fakery here. If you watch my other videos, you'll see I show things that don't work as well as those that do.

Nice to see you ...
By: MadScientist267. on 12 Jan 12, 04:28:15
Nice to see you have all these people snowballed. Care to explain how 10, maybe 11V OTV mysteriously is able to get the filament hot enough to emit light, by running it through a BUCK converter? At the same speed (and? what even seems slower)? What you're proposing (and your followers don't understand) is that to overcome the resistance in the coils (and light the halogen), is that you'd need to be crank at an RPM that produces upwards of 80V. Not happening with your arm, pal. Try again.

@sjh7132 Thanks so? ...
By: HHOcowboy. on 08 Jan 12, 21:28:19
@sjh7132 Thanks so? much for the quick response .. Would like to stay in touch with you via email .. What's the best way of giving you my email address without the publicity? Thanks Again..

@HHOcowboy I'm ...
By: sjh7132. on 08 Jan 12, 21:16:02
@HHOcowboy I'm trying to? get a few prototypes done to send them to some friends with turbines to see how they do in the real world. I'll post more videos when I can show some progress.

Excellent ... I ...
By: HHOcowboy. on 08 Jan 12, 21:14:19
Excellent ... I have the same Smart Drive motor planning on building into a VAWT. I would like to know more about this board ... Need to start doing something very soon .. our electricity bill is going up once again and really plan on using some homebuilt power to help offset the cost of my current power consumption. What's? sad, I don't use that much ...

@wtam69 Exactly,? ...
By: sjh7132. on 02 Jan 12, 15:37:36
@wtam69 Exactly,? except in most DC DC converters in power supplies they regulate the output voltage or current. On this board the microcontroller is more worried about the operation of the wind turbine and pays attention to the load and power of the input. It also does work to protect the battery or other device on the output. I also used a technique called Synchronous rectification to make it more efficient

Is this like a dc ...
By: wtam69. on 02 Jan 12, 15:00:25
Is this like a dc to dc voltage step down converter instead of the usual dc to dc step up converter? With the decrease in voltage through the board, the current is increased. Of course I see you have a lot of? electronics to store the energy and to determine when the energy is released. Sorry for the non layman language as I'm not an engineer.

@fuba44 The first ...
By: sjh7132. on 02 Jan 12, 05:24:32
@fuba44 The first step is to get a few prototypes to people for testing, then some will be sold by Tree Top Windmills with their turbines. (They funded much of the prototype costs).? Finally maybe there will be a kit or something in the future.

@TheJimmax My ...
By: sjh7132. on 31 Dec 11, 18:13:28
@TheJimmax My board comes alive at 12v input and a transistor change will change that to 8v. With this alt that's about 8 rpm. Even with other alts it's usually not very high RPMs before the controller? is alive. There is also an option to get powre from the load (battery) or some other source like a wall wart power supply.

Perfect Steve! when ...
By: itsandbits1. on 31 Dec 11, 16:52:54
Perfect Steve! when this is finished the orders will start to pour in. The? applications are endless and the time and effort you put into this should be rewarded. You know I've been in line since the beginning.

Very cool! Good to ...
By: Aceman307. on 31 Dec 11, 14:52:22
Very cool! Good to see a new video? from you.

Steve good job ...
By: CNGBOB. on 31 Dec 11, 14:12:03
Steve good job Thank you for working? on this. This is a game changer for small wind turbines. Bob Mann Tree Top Wind Mill

Have you tried the ...
By: Fearlessthinker. on 31 Dec 11, 10:41:59
Have you tried the Wind rated SunG GTIs? - they seem to work well with 24V class PMAs. The MPPT firmware I believe was just modified for a wind turbine profile. Larry Leamy even developed a way to stack a 10.8-30V (light wind) and a 22-60V (high wind) rated ones so that power can be delivered over the whole small wind voltage range, with the dump? triggered at 60V to prevent runaway. He has 2 Windmax and one Windy Nation turbine, each running 2 GTIs w/stacking circuit. Good work man.

Train_Shots
Posted by: sjh7132

Video duration: 143 seconds

This is a short break from the wind turbine videos to show off some of my (our) Lionel trains. The track is a little over 100ft long and is a simple loop.

Related: lionel, model, trains, o27, railroad, electric

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Java based Physics Simulation of Adaptive VAWT Blades
Posted by: sjh7132

Video duration: 512 seconds

This video shows some java classes that I wrote to construct models of physical systems, including masses, springs, dash-pots, ropes / rubber bands, and wings. I wrote this software in an attempt to simulate VAWTs with blades that can pivot and are balanced with a counter weight.

Related: sharp, vawt, simulation, java, classes, physics, science, cfd

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Latest comments made on this video:

Source code??
By: peter007kitty. on 29 Oct 10, 18:20:49
Source code??

@JamesThomas See ...
By: sjh7132. on 16 Oct 10, 22:33:19
@JamesThomas See the vawts dot net discussion forum. I started a thread about? analysis of this VAWT and ran it against a fixed wind model using the same blade.

@JamesThomas ...
By: sjh7132. on 11 Oct 10, 01:05:47
@JamesThomas Hopefully there will be. I'm finding that? how you tune the balance of the blade has a major effect on these blades efficiency and speed so I'm working on that first.

Very? nice work. ...
By: JamesThomas. on 11 Oct 10, 00:55:15
Very? nice work. Any way of currently determining or modifying your program to reveal how much more efficient a self-correcting wing is over a fixed design?

@sjh7132 The one ...
By: sjh7132. on 09 Oct 10, 16:27:25
@sjh7132 The one in real life had some design problems. (Weight in the wrong places, blades too large, blades flat with bad leading edge.) If it wasn't self adjusting it wouldn't have spun at all, so? I considered it a successful proof of concept. Now I need to work on a serious attempt.

@MrNightLifeLover ...
By: sjh7132. on 09 Oct 10, 16:25:44
@MrNightLifeLover I just plotted lines and circles. Then to make the movie, java has this nice class called a BufferedImage, and you can draw? to the image like you'd draw to the screen. Then in another single statement you can have the imaged saved off as a jpg, or gif or whatever. So I just created 1000's of images and then chained them together with Photolapse, a free program on the net.

@Aceman307 It's ...
By: sjh7132. on 09 Oct 10, 16:22:53
@Aceman307 It's actually not my idea. Several people? have had similar ideas, one of them is Peter Sharp. He is the one who introduced me to the idea. You can read about the SHARP VAWT on the vawts (dot) net discussion board, along with many other good ideas.

Interesting design. ...
By: Aceman307. on 09 Oct 10, 14:01:30
Interesting design. How is the one you are working on in real life doing. I am? getting ready to change my blades on mine, I could experiment with some of your ideas.

cool stuff?
By: HeavyDemir. on 09 Oct 10, 08:59:12
cool stuff?

Nice how did you ...
By: MrNightLifeLover. on 09 Oct 10, 08:55:51
Nice how did you do? the visualization?

Simulating VAWT Startup
Posted by: sjh7132

Video duration: 297 seconds

This video shows a new software tool I wrote that lets me simulate and check for VAWT startup problems.

Related: sience, free, energy, vawt, turbine, wind, startup, power, naca0020, s1223

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I've been looking ...
By: hmortensen2907. on 01 Jun 11, 21:20:08
I've been looking for a CFD application to be able to use my GA to do some wing design. So I was glad to find OpenFoam, but talking about a steep learning curve! And now I find that, you have already done lot of the work.. and even created Spinner to do? the dynamic testing.. Would it be possible to acquire the Spinner software? Would love to be able to concentrate on the wind design (GA) and not having to start from scratch on the simulation. Thanks.

@nrodge1 ? You ...
By: sjh7132. on 09 Mar 11, 14:42:05
@nrodge1 ? You should also check out vawts DOT net, I've posted lost of blade tests there under 'spinoff-results'

I like this, please ...
By: nrodge1. on 09 Mar 11, 07:44:09
I like this, please design a kick ass simple? to build DIY VAWT for all of us! Green energy forums techluck DOT com

@overunitydotcom ...
By: sjh7132. on 03 Nov 10, 04:05:31
@overunitydotcom There are two types of VAWTs, lift type and drag type. I think you are thinking of a drag type which moves slower, but has more torque. The lift type spins faster with less torque which is? usually better for getting power out of alternators.

Well done ...
By: overunitydotcom. on 03 Nov 10, 03:23:52
Well done simulation, but why are you using such poor blades and not quarter circle blades or something? simular ?

@Guru1ofatl No it ...
By: sjh7132. on 25 Sep 10, 21:24:12
@Guru1ofatl No it turns out that 3 is a nice? number from a mechanical support and resonance point of view.

Great vid, ...
By: Guru1ofatl. on 25 Sep 10, 16:36:02
Great vid, informative and interesting. Have you thought of adding a fourth blade to? your current design?

Great vids, very ...
By: Guru1ofatl. on 25 Sep 10, 16:34:57
Great vids, very interesting and informative. Just curious, have you thought of? adding a fourth blade to your current design?

@lordvon64 I'm ...
By: sjh7132. on 08 Sep 10, 01:38:40
@lordvon64 I'm running a laminar flow simulation and I should really be modeling turbulent flow. So my upwind drag isn't as high as it should be, making? the power numbers kind of high. The general behavior of the turbine and relative powers to other turbines seems to be pretty good. I'm using OF1.5-dev with GGI.

I am an aspiring ...
By: lordvon64. on 08 Sep 10, 00:20:41
I am an aspiring OpenFOAMer, and this video is inspiring. What version are you using? Are you using either ggi or sliding interface? Do you have any validation? data?

@itsandbits1 No ...
By: sjh7132. on 23 Aug 10, 16:13:38
@itsandbits1 No this video was about trying to figure out why VAWTs don't start. I do plan to do a bunch of standardized test, and those will have "Spinoff" in the title,? and will be run at standard wind speeds

ok sorry, I thought ...
By: itsandbits1. on 23 Aug 10, 16:11:33
ok sorry, I thought you were doing standardized tests with the only variable being the blade. ?

at 3:28 it shows 37 ...
By: itsandbits1. on 23 Aug 10, 16:07:09
at 3:28 it shows 37 rpm for a tsr of 1.25 and then at 4:36 it shows a rpm of 38 for a tsr of .45 If the wind speed and the diameter is not changed; as you say this is a standardized test, then this is what I? question

@itsandbits1 Wind ...
By: sjh7132. on 23 Aug 10, 16:06:24
@itsandbits1 Wind speed was not the same. Listen to? what I say and read the text at 2:09, which is about the second run (5mph). Then read the text at 3:41 which is about the last run (15 mph). Same rpm, 3x the wind speed = 1/3rd the TSR.

at 3:27 it shows 37 ...
By: itsandbits1. on 23 Aug 10, 16:02:36
at 3:27 it shows 37 rpm for a tsr of 1.25 then at 4:35? it shows 38 rpm for a tsr of .45???? If the wind speed is the same for all of them and the dia is the same for LL OF THEM ???? THIS IS WHAT i QUESTION

The last two had ...
By: sjh7132. on 23 Aug 10, 01:18:17
The last two had very close? RPMs, but run #2 was 5 MPH wind and the last one was 15 MPH wind.

why, if the dia. ...
By: itsandbits1. on 23 Aug 10, 01:10:09
why, if the dia. wind spd , and rpm is the same, is? there a high tsr for one profile compared to another. I thought the variables: wind speed, rpm diameter were the factors to get tsr. The last two examples are 60"at 15 mph and the rpm is as close as you can get , yet one is over 1.25 and the other is less than .5?????

Nice? video.
By: Aceman307. on 19 Aug 10, 22:43:40
Nice? video.

Great vid you ...
By: TK42138. on 19 Aug 10, 09:26:25
Great vid you obviously have a talent.?

Testing on the pole
Posted by: sjh7132

Video duration: 215 seconds

This is the 3rd part of testing my VAWT, this time on the pole. Power was not impressive, but I think that may be the fault of my alternator which has a huge air gap and high resistance coils.

Related: wind, turbine, vawt, free, power, science, engineering, alternator, naca0020, naca, lift, danarious

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Latest comments made on this video:

@rikkiesix Hey ...
By: sjh7132. on 15 Jan 11, 03:46:04
@rikkiesix Hey Eric, since you were asking? about the alt, I thought I'd let you know I teamed up with a guy named LymxSteam on youtube and we created the ultimate alternator. You can see if in the USVAWT channel. (The new name we call ourselves)

Very nice. Bravo :) ...
By: Zypkin. on 21 Jul 10, 22:08:53
Very nice. Bravo :) since U are? just testing and U dont generate much power, you could try reducing the diameter of the turbine and get some more speed (and voltage). ...and maybe get a serious pole??? :)))

@rikkiesix Yes, ...
By: sjh7132. on 19 Jul 10, 02:40:17
@rikkiesix Yes, axial flux, but I didn't do a good job on it. My stator is very warpped because I? didn't clamp it down when I poured it. I will do better next time. I got the magnets from the windstuffnow site. When I build an alt that works well, I'll post the specs. This one is not worth duplicating.

@emagnets Sam are ...
By: sjh7132. on 19 Jul 10, 02:37:52
@emagnets Sam are you still working on your left type VAWT? I have to say, when something? with a 5 ft diameter is spinning above your head at 200 RPM, it's SCARY! I'm just glade mine is Styrofoam and light aluminum. If it was wood I think I would have ran for cover.

@Caleb6543 Yes, ...
By: sjh7132. on 19 Jul 10, 02:36:27
@Caleb6543 Yes, I'm a Trekie. ? I was thinking that a lenz inner VAWT with some outboard lift blades that were match properly could be a killer combination.

from what I? can ...
By: itsandbits1. on 19 Jul 10, 01:35:29
from what I? can see of your airfoil I think it is a high performance blade and needs a lot more wind but opening up the angle of attack might give it a little more at the lower wind speed. try maybe 3-5 degrees out and if that doesn't work try in. I think you need to get up in the air with alot more structure on the blade mounts and pole. keep it up though cause the never stops. It just goes somewhere else when u need it

Hi, is your ...
By: rikkiesix. on 19 Jul 10, 01:01:38
Hi, is your generator a axial flux one? What wire and how many rounds did you use if so. And how stong are your magnets? By the way,? great progress. Keep it up Greetings Erik

i like it. true. ...
By: emagnets. on 19 Jul 10, 00:40:50
i like it. true. The mass (weight) does help the rotation. light blades need the rpm. not bad dude. i wish i had the? open land/space. I live in a valley full of trees. great works. sam

Congratulation! ...
By: Caleb6543. on 19 Jul 10, 00:07:38
Congratulation! That's a big turbine for such a small pole. That may be an advantage of lift type blades ... not much area for side loading. Did I hear right that? the blades drop out of warp; could be a good new technical term. :-) Based on your results, I think I want to try augmenting my Savonius turbine with some lifting blades at say 3x the diameter.

@itsandbits1 The ...
By: sjh7132. on 18 Jul 10, 23:42:54
@itsandbits1 The AOA is 0 degrees. (mounted at the 40% point of the wing.). I'd guess the wind was about 15 mph. TSR? was about 2.3.

whats the angle of ...
By: itsandbits1. on 18 Jul 10, 22:27:22
whats the angle of attack on your blades??? Is the tip towards the center or away? definately should be getting more power. at 200 rpm it should at least do 50-80 watts for a medium speed range unit higher for a low speed.. By the? way how fast was the wind blowing?

More VAWT Experiments
Posted by: sjh7132

Video duration: 580 seconds

This video show experiments I did with various VAWT configurations.

Related: vawt, wind, turbine, free, energy, engineering, science, air, foil, s1223, naca, 0020, power

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Testing the 3/4 Elliptical blade VAWT
Posted by: sjh7132

Video duration: 135 seconds

Test of my elliptical blade VAWT. The blades have a chord of 8 long and 3.2 inches thick. The outside back quarter of the ellipse is removed.

Related: vawt, turbine, wind, energy, science, power

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Analysis of the LynxSteam Turbine
Posted by: sjh7132

Video duration: 310 seconds

Analysis of the LynxSteam Turbine done with OpenFoam-1.5-dev. The mesh was made with gmsh. The results look good, and so does the turbine.

Related: science, engineering, free, energy, turbine, wind, vawt, cfd, openfoam, mesh, renewable

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Latest comments made on this video:

ok thanks for your ...
By: camomantube. on 24 May 11, 02:49:51
ok thanks for your help all the? best andrew.

@camomantube I'd ...
By: sjh7132. on 24 May 11, 02:47:55
@camomantube I'd have to dig this one out of the archives to find out because I did this sim a long time ago. But Lynx Steam (Marcus) has since moved on to lift vawts because he wasn't happy with the power from this mode. See vawts dot net for his latest work. (His latest one is called? the Challenger.)

i see in test 6 ...
By: camomantube. on 24 May 11, 02:39:09
i see in test 6 your wings were around 45 degrees was this the most efficient angle and if so please can you tell me the exact degrees of your? wing thanks andrew.

Excellent ...
By: DrFox2000. on 09 Feb 11, 17:43:46
Excellent presentation.? We appreciate your efforts.

@sjh7132 The new ...
By: MrNightLifeLover. on 09 Oct 10, 13:33:34
@sjh7132 The new fermi tesla cards support 64? bit float. (Google for Fermi Whitepaper) However they are quite expensive and I think 64bit is disabled if you use a consumer card (such as the GTX 480) I'm also not sure about the OF support for GPUs, but I think there are people working on ways to solve the linear system on GPUs..

What hardware did ...
By: MrNightLifeLover. on 09 Oct 10, 13:27:57
What hardware did you? use?

@HeavyDemir? Yes
By: sjh7132. on 11 Sep 10, 19:41:35
@HeavyDemir? Yes

this is on a linux ...
By: HeavyDemir. on 11 Sep 10, 17:15:07
this is on a linux machine? ?

@lordvon64 ...
By: sjh7132. on 08 Sep 10, 01:41:28
@lordvon64 icoDyMFoam, which is laminar flow. It's not 100% accurate (simulated power is a little high), but I'm still learning about turbulence models and how? to mesh them.

What solver and? ...
By: lordvon64. on 08 Sep 10, 00:26:15
What solver and? turbulence model did you use for this simulation?

Great work. Wow. I ...
By: jashalen. on 29 Jun 10, 11:06:13
Great work. Wow. I hope in a few years I can make stuff like? this.

@itsandbits1 I ...
By: sjh7132. on 07 Jun 10, 06:09:57
@itsandbits1 I can't really tell what the blade shape is. ? Maybe someone could post a drawing on vawts DOT net.

youtube remkick and ...
By: itsandbits1. on 07 Jun 10, 05:56:20
youtube remkick and give me some data on what this blade in a 3 blade set should do. take a close look at the back kick on? the tail end of the blade. the blades are 60" and the diam. is 6"

Another? great work.
By: Shalek. on 12 May 10, 11:31:34
Another? great work.

Very useful ...
By: WSBToulouse. on 08 May 10, 20:25:20
Very useful sumulation. Confirms the experiment with similar? VAWTs. Thanks for sharing this.

@565Customz ...
By: sjh7132. on 08 May 10, 03:55:33
@565Customz Problem is video cards are 32 bit and I use? 64 bit math so the errors don't add up to be significant.

get some? video ...
By: 565Customz. on 08 May 10, 03:20:14
get some? video cards...knock that 3 days down to minutes

I will build one, ...
By: fernandesilyt. on 05 May 10, 21:07:36
I will build one, and put in my? roof. :)

Lenz2 Blade Simulation
Posted by: sjh7132

Video duration: 274 seconds

This is an OpenFOAM simulation of a Lenz2 blade. The solver is IcoDyMFoam. The blade is 18" from the center and is rotating at 60 RPM. The wind is 15 MPH (6.7 m/s). The torques shown are for a 1.0 cm long blade. So multiply by 100 for a meter long blade.

Related: cfd, openfoam, lenz2, wind, turbine, science, simulation

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Latest comments made on this video:

Can you do a 3D ...
By: MySchizoBuddy. on 30 Apr 11, 16:13:03
Can you do a 3D simulation. Or how do you translate a? 2D simulation into 3D result.

@HeavyDemir? This ...
By: sjh7132. on 21 Aug 10, 22:07:06
@HeavyDemir? This was when I was just learning now to simulate. I'm much better at it now. :-)

Dam? cool stuff, ...
By: HeavyDemir. on 21 Aug 10, 22:03:38
Dam? cool stuff, keep it coming

Awesome job! I ...
By: Keveeee2000. on 06 Mar 10, 17:16:01
Awesome job! I have been working on a modified version of the Lenz 2. It would be interesting to see how it would? work in this sim.

This is really ...
By: FreeMagneticEnergy. on 23 Oct 09, 15:53:59
This is really awesome. The vertex data starting at 1:38 reminds? me of the formation of hurricanes.

The normal lenz2? ...
By: sjh7132. on 18 Sep 09, 18:08:46
The normal lenz2? turbine uses 3 blades and that helps balance the torque all the way around.

You have to use the ...
By: sjh7132. on 03 Sep 09, 02:25:58
You have to use the Openfoam-1.5-dev version (maybe 1.6 now). The interface to the moving grid is called GGI (general grid interface, I think). A search on those terms might get you? something.

This is great! The ...
By: LinuxRex2. on 03 Sep 09, 01:17:56
This is great! The vertex based data looks much better now. BTW, how do you move your? mesh in OpenFoam? How do you define the interface region between the static portion of your mesh with the moving circular mesh? Do you have any kind link you could post that shows us how to move the mesh? Cheers!

I can see in the ...
By: trailkeeper. on 02 Sep 09, 12:27:09
I can see in the graph, and taking the top of the vid area as 0 degrees, that torque is low or negative in fact (I guess this would be drag then) at 0 degrees, and then it's a bit low at 180? degrees.A very high peak at 90 degrees, and a fairly high peak at 270 degrees.Having two peaks is a good, hence that blade design is good. I guessing that things for the turbine system will change if another blade is introduced at 180 degrees - perhaps to add some torque into the system for when it was low?

That is? fantastic!
By: Caleb6543. on 02 Sep 09, 12:16:06
That is? fantastic!

Flat plate in the Wind
Posted by: sjh7132

Video duration: 421 seconds

An OpenFOAM simulation of a 25cm x 1m plate being rotated at 6.7m/s (15 mph) in a 6.7 m/s wind. The radius of rotation (to the center of the plate) is 24 inches.

Related: cfd openfoam

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@sjh7132 Did you ...
By: DKSune. on 21 Jul 11, 11:58:47
@sjh7132 Did you ever put that web page together? I would be? very interested to see how you managed your simulations. Great work!

@sjh7132 Thanks. ...
By: anariaq. on 24 Apr 10, 00:22:00
@sjh7132 Thanks. will look into it. Don't mind if I can ask later about things??

@anariaq I have ...
By: sjh7132. on 24 Apr 10, 00:15:07
@anariaq I have not used 1.6 yet because it won't handle the rotating meshes. Openfoam comes with a bunch of examples, one of them is a 2d simulation of a wing shape. To answer your question on speed.? The rotating turbines simulate at about 20ms per hour (varies according to mesh complexity.) The 3d ones take much longer. However since you are really simulating a stationary wing, you can probably get good results in a few hours.

@sjh7132 Hmm I can ...
By: anariaq. on 24 Apr 10, 00:11:31
@sjh7132 Hmm I can get 1.6 My interest is airplane ;) but think a 3D calculation take time?? Will get to work on installing it

@anariaq If you ...
By: sjh7132. on 23 Apr 10, 23:56:29
@anariaq If you can download Openfoam-1.5-dev and get it installed, I can send you an example tarfile of a case that does the lenz2. I'm? putting together a web page of some example cases.

Hey how hard is it ...
By: anariaq. on 23 Apr 10, 23:53:23
Hey how hard is it to get into how to use this program? and how long dos? it take to compute?

Ahh you are there, ...
By: johnjejo. on 06 Apr 10, 22:26:54
Ahh you are there, great. Ok, the first low torque position is where the wind is flowing (most) smoothly past the plate. Just like in sailing. In sailing the most optimum position for a sail is at 45 degrees to the wind ie. sailing across the wind. The second place you note is the same but the wind is not flowing past the plate smoothly. I'd like to see a yacht sail shape e.g. Rounded nose, long trailing flat but with some belly. The shape is designed to? embrace the eddies that spin off.

@johnjejo Yes, the ...
By: sjh7132. on 06 Apr 10, 22:23:02
@johnjejo Yes, the plate moves at? a fixed rate, and the force of the air on the plate is measured.

??? How does the ...
By: johnjejo. on 06 Apr 10, 22:17:48
??? How does the plate move against the wind?? Are you powering the plate around? Do you sail (yachts) by the way?

I use Pinnacle ...
By: sjh7132. on 01 Jan 10, 16:53:40
I use Pinnacle studio 8+ and apparently it can't render in HD.? :-(

Upload in Full HD! ...
By: MrNightLifeLover. on 26 Nov 09, 10:22:12
Upload in Full HD! ;)?

Yet another HAWT
Posted by: sjh7132

Video duration: 295 seconds

Information about yet another one of my wind experiments. This is a 7ft dia HAWT. Goals were to make it very discrete and make it tougher than my last one. Efficiency is fairly low and hasn't been measured carefully. I estimate its output to be 40-50W (mechanical energy) which makes it about 15-20% efficient.

Related: hawt, wind, turbine, science, free, energy, pvc, blades, mill, neighborhood

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@Shalek That can ...
By: sjh7132. on 20 May 10, 05:20:24
@Shalek That can be done, but it's not as good as just having longer blades. Plus that funnel would have to change it's position? according to the wind direction.

Hello it's me again ...
By: Shalek. on 20 May 10, 00:56:52
Hello it's me again, I've grown rather curious about? something lately. Could one use a funnel of sorts to be able to reduce the size of the blades required and/or to obtain a greater yield from the turbine?

@Shalek A house ...
By: sjh7132. on 14 May 10, 15:11:34
@Shalek A house uses about 1000 watts. This turbine made maybe 50 watts in a? good wind. So about 20 turbines. I think I can do better.

Silly question, ...
By: Shalek. on 12 May 10, 11:33:20
Silly question, about how many of those would you need to power your house? Is it fiseable and practical??

Hello, nice work ...
By: MatthewAT385. on 16 Aug 09, 14:22:47
Hello, nice work youve done. Its really nice to see someone so amused? with building something, in this case wind harvester =) Oh precious feel, when you see it works Good luck, Matthew

I think so, but the ...
By: sjh7132. on 16 May 09, 22:57:30
I think so, but the widest? your blade could be is 1" at the middle and it's going to get narrower from there. At some point the PVC is thicker than the blade is wide and that part of the blade doesn't do much good. Try it and see. I'm sure it will spin. Then make a video and show me how it works. :-)

great wind turbine? ...
By: DeanC993. on 16 May 09, 22:52:32
great wind turbine? you are super at this

i have a 2" dia PVC ...
By: BeefyCrackers12. on 16 May 09, 18:01:04
i have a 2" dia PVC.. would that be okay for a? smaller 4 - 4.5' dia turbine?

For a 12" hub the ...
By: sjh7132. on 16 May 09, 06:23:48
For a 12" hub the measurements around the outside of the 3.5" dia PVC were: at the hub edge 3.0" 1ft from the hub 1.8" 2ft from the hub 1.3" 3ft from the hub 1" At the hub you need to widen it out so you can put screw holes through what would be 0 inches. I think to be more efficient, the blades have to be cut? to be a little faster (thinner).

damn that is a very ...
By: BeefyCrackers12. on 16 May 09, 05:28:16
damn that is a very nice turbine u got there.. i just baught a long 10 foot peice of? pvc and im going to cut some blades.. what were the measurments and all on ur blades? thanks 5*s

awesome video very ...
By: michael970. on 15 May 09, 23:00:50
awesome video very nice job? on turbine great blades pretty soon your neighbors will have you building them some turbines I hope.keep us updated

Testing My Wind Turbine (HAWT)
Posted by: sjh7132

Video duration: 218 seconds

Testing of a small wind turbine with PVC blades and a home made alternator. The blades are cut from 3" PVC and are 1ft long plus 4 inches to mount it to the hub. The alternator uses 12 magnets and 9 coils, 3 coils on each phase.

Related: wind, hawt, science, power, free, energy, mill, turbine, failure, stress

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@Zypkin TRUE THREU ...
By: muddymuddymuddmann. on 07 Jul 10, 09:38:47
@Zypkin TRUE THREU AND TRUE. AND SOLAR FILLS THE GAPS IN THE WIND VERY WELL. WIND OR SOLAR ARE ONLY? PART TIME GIGS. MUDDy

@muddymuddymuddmann ...
By: Zypkin. on 05 Jul 10, 04:56:36
@muddymuddymuddmann ...I think U just got to the point :) 5 days of wind at 35mph with a 1.5kW generator make up for a 365days of production with Ur small scale 9mph generator... plus you have much less working hours this longer lifetime. And that's all... you have to use the wind when and where there is wind... otherwise you go? solar :) Or course one has to find a compromise, but I believe it's worth to keep in mind that higher power comes with higher winds.

@Zypkin ACTUALLY I ...
By: muddymuddymuddmann. on 05 Jul 10, 01:15:12
@Zypkin ACTUALLY I THINK INDUSTRY DOESNT CARE ABOUT THE INEFFICIENCIES AS COMPARED TO THE COST OF THE EXTRA MAGNETS. AND THE LOW WIND STARTUP AND LOW RPMs OF THE AXIAL FLUX'S ABILITY. IF THEY DID, THEY WOULDNT MAKE A SMALL 4 FOOT PROP AND RATE IT AT 1.5 KW. IT TAKES ABOUT 35 MPH WINDS TO GET THERE. WE DONT HAVE MANY DAYS? OF THAT PER YEAR. WHEN THE WIND SPEED IS CUT IN HALF THE POWER OUT IS CUT BY 8 TIMES. 9 MPH IS 1/64th THE POWER. 23 WATTS. AND IT COST THE CONSUMER HOW MUCH? MUDDy

@muddymuddymuddmann ...
By: Zypkin. on 04 Jul 10, 17:43:11
@muddymuddymuddmann ...I invite you to do a few tests and see the difference between an iron core and a dual rotor air core :) ...dont U think that if? axial flux air core is so effective we'd be producing energy that way instead bothering with tons of iron in our MW generators?

@Zypkin Hey friend, ...
By: muddymuddymuddmann. on 02 Jul 10, 13:51:03
@Zypkin Hey friend, It? is a common statement. The difference of the dual magnet rotor axial flux PMA is. There are 2 magnet rotors that are of opposite poles. So the magnetic flux travels from the back of one magnet to the one next to it. This makes each magnet 2 x stronger in flux current. The other rotor does the same thing but in opposite polarity. thus the flux is directed through the coils instead of to the magnet beside it. That is why they need no ferrous metal in the coils. full circle.

@muddymuddymuddmann ...
By: Zypkin. on 02 Jul 10, 08:19:54
@muddymuddymuddmann ...this is a? common statement but it's totally wrong! No iron in the machine means a lot less field in the coils (100-1000 times less!!!) which means that to get the same voltage you have to use a lot of copper (turns in coils), therefore the impedance (resistance) of Ur machine will be much higher and the internal losses will be huge compared to those of the same machine with iron cores....... ...think abt it :)

@Zypkin ...actually ...
By: Zypkin. on 02 Jul 10, 08:16:15
@Zypkin ...actually like this I'm really surprised that? it works at all! By using a counterplate you'd be able to increase the magnetic fiels inside the coils by a big deal... probably more than 50%... which means you could reduce by the same amount the number of turns in each coil and consequantly the overal resistance of the generator (read cut the losses by a lot)... ...more on this on reuqest :)

hey... you should ...
By: Zypkin. on 01 Jul 10, 20:39:11
hey... you should use an iron counterplate on Ur generator... if? U really use one disk as U show in the video U have an open magnetic circuit... not much efficiency :(

Are you asking ...
By: sjh7132. on 13 Jan 10, 15:18:15
Are you asking about the music or song? I use Pinnacle Studio 8 for editing my videos and the song was something that came with? the software.

which sound was ...
By: Yaaroslav. on 13 Jan 10, 10:52:16
which sound was placed on your video??

Its still a great ...
By: muddymuddymuddmann. on 24 Dec 09, 05:47:58
Its still a great machine. Axial flux alternators are the best. because they have no ferrous stator material in the coils. that means there are no eddy currents, and no lens? effect except in the coils them selves. Free spin until they meet the charging voltage. no waste. MUDDy

Thanks Mud. The ...
By: sjh7132. on 23 Dec 09, 15:35:18
Thanks Mud. The blade did get improved in a later video. The magnets are? backed by steel, but there isn't a second layer of magnets behind the coils and that hurts the power.

One solid piece ...
By: muddymuddymuddmann. on 23 Dec 09, 06:42:52
One solid piece blade would be good. I noticed the narrow spots are where the blades broke. I love the stator. the rotor would deliver 4 times the power with a steel backing to channel the magnetic flux. Sorry if i missed anything the speakers are out on this puter. This is definitely 5 stars. The tail was the best use of an old advertisement political sign ever. Who complained about the wind turbine the most?, the DEMs or the REPs MUDDy?

e menomale che? sci ...
By: chissD. on 16 Oct 09, 22:40:40
e menomale che? sci ingegnere'? della muino bianco ?

You? should win an ...
By: embeddedprogrammer. on 04 May 09, 14:44:51
You? should win an award for "best use for a campaign sign"

I came to the same ...
By: sjh7132. on 21 Apr 09, 20:12:16
I came to the same conclusion. My? next one will be at least twice as big. I will also make sure I keep it under load.

You can get some ...
By: Caleb6543. on 21 Apr 09, 20:03:31
You can get some high stresses with a small diameter turbine because the rpms have to be very high to get a good tip speed compared to the wind speed. And centrifugal acceleration goes up with the square of? the rpm.

Seems reasonable to ...
By: trailkeeper. on 16 Apr 09, 18:15:20
Seems reasonable to take that part out of the equation since theres no power there to include into the efficiency. I guess your calculation is for the available power to the windblades as being the collectors of the wind available to them only. I seen some people use (pi r^2), but I guess? that's the theoretical wind power to everything including the hub, but I guess now its not fair to include that into the specific efficiency of the windblades, hence it's a better value to use.

I used PI r^2 ? - ...
By: sjh7132. on 16 Apr 09, 14:23:07
I used PI r^2 ? - PI R^2 Where r is the total radius ,and R is the radius of the hub. (I figured the hub didn't really make any power.)

Did you calculate ...
By: trailkeeper. on 16 Apr 09, 09:07:33
Did you calculate the swept area using the formula for the area of a circle (pi r^2)??

I don't think so. ...
By: sjh7132. on 15 Apr 09, 15:15:49
I don't think so. I think fiberglass resin is a one? way chemical reaction. I can always make a new stator though.

you should ue a ...
By: DeanC993. on 15 Apr 09, 11:57:16
you should ue a furling systym good? luck

Is it possible to ...
By: trailkeeper. on 15 Apr 09, 05:44:22
Is it possible to soften the alternator a bit in? an oven and press it level again?

LOL, yes, that's ...
By: sjh7132. on 15 Apr 09, 04:52:48
LOL, yes, that's the plan but first I need to? make some electronics to control it.

well you can? ...
By: DeanC993. on 15 Apr 09, 00:49:57
well you can? always make a better one(:

Testing My Experimental Wind Turbine (VAWT)
Posted by: sjh7132

Video duration: 319 seconds

A video about my experimental wind turbine and the techniques I used to measure it's output. Video shows how to calculate expected output, and some of the basic equations used for doing this type of testing.
The VAWT is 2ft tall with a 16 inch diameter.

Related: vawt, wind, turbine, power, measurement, green, energy, free, science, electronics, current, voltage, calculations, physics

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@Windroseism dims? ...
By: sjh7132. on 02 Feb 12, 15:31:14
@Windroseism dims? are on one of the first comments above. It did self start by rocking back and forth until it took off. The airfoil is a simple ellipse.

I think chord ...
By: Windroseism. on 02 Feb 12, 08:10:44
I think chord length is little bit higher than necessary. What is? your dimensions? Also was it able to start automatically? i mean self starting. Finally what type airfoil did you use?

WORLD RECORD: ...
By: TheServiceWeb. on 12 Jan 12, 05:13:57
WORLD RECORD: BIGGEST WIND TURBINE Visit: windturbinecarriedbywheels.weebly.com ZERO-NOISE from gears and generators since they're sealed underground. SAVES THE BIRDS AND BATS since the turbines are slow-moving. DOES NOT NEED TO OCCUPY A WIDER LANDSCAPE since the turbine can be very tall. MAY BE LOWER-COST since it can use parts of junked trucks and others. ELUDES HURRICANE FORCE since the blades automatically close. HELPS THE WIND? ENERGY COMPANIES since it is FREE FOR ALL.

@ed4ed Thank? God ...
By: 2tostado. on 27 Dec 11, 05:14:28
@ed4ed Thank? God someone noticed the rails in the back, that aint no natural phenomena . Keep ur head up

you know? what?i ...
By: denisetakahashi. on 12 Oct 11, 12:02:55
you know? what?i dont comment most videos but this one you made explains very well to even retards.i know calculation electronic and stuff but the way you show it is a sample for anyone who wants to put video on youtube!!very well mr.!!vey well

@Mrinfoone The ...
By: sjh7132. on 26 Sep 11, 16:30:31
@Mrinfoone The wings are simple ellipses 9" x 1/2" x 24" and they are mounted 8" from? the center at an angle of 0 degrees measured at the center of the wing.

can you send me the ...
By: Mrinfoone. on 26 Sep 11, 05:47:40
can you send me the dimensions diagram? off the wings and or diagrams? so i could build one thanks

Thank you. One of ...
By: elwood173. on 13 Aug 11, 05:45:24
Thank you. One of the best turbine videos I? have been able to find. Good info.

@215alessio That's ...
By: sjh7132. on 28 Jul 11, 23:32:59
@215alessio That's true if the the turbine has the power to push the alt to that point. In my case the turbine was too weak so the peak power point would? be more determined by the characteristics of the turbine and not the alt.

the best output ...
By: 215alessio. on 28 Jul 11, 23:15:57
the best output power is when the amps equal the voltage forming a perfect square in the voltafe amps graphic respecting the max output amperage of your coils ofcourse?

@walkertongdee In ...
By: sjh7132. on 04 Mar 11, 15:00:22
@walkertongdee In this video the wing is just an ellipse (squashed circle) and it's mounted with a mount angle of 0 degrees. (aoa generally is relative to the wind, which changes depending on where the wing is in it's rotation.) In other videos I use air foils. Many people build their? turbines so they can adjust the angle, I never have.

I waw wondering if ...
By: walkertongdee. on 04 Mar 11, 14:49:10
I waw wondering if the wings are an airfoil shape? like an airplane wing, I cant really see them and if so how did you choose the angle of attack? Would it be a good idea to be able to rotate the wings to set the attack angle? Please respond..

@craftmatic2 Solar ...
By: purplemutantas. on 27 Feb 11, 08:09:36
@craftmatic2 Solar is good. But solar only works during the day. It's also not ideal in places where you get less sun. A combination of wind and solar would be better. Where I live it's? frequently cloudy. So I am looking into wind generators to go along with solar.

@craftmatic2 Or ...
By: sjh7132. on 05 Feb 11, 16:36:53
@craftmatic2 Or just? a plain old solar panel. I have 1000 watts of those running already. I'm just exploring other options.

I think you'd get ...
By: craftmatic2. on 05 Feb 11, 16:35:31
I think you'd get far more power using Solar to drive a small? steam engine and run the alternator that way...and for a similar price.... See the Green Power Science guy, Dan Rojas....

@ed4ed Those? are ...
By: sjh7132. on 02 Feb 11, 20:34:58
@ed4ed Those? are high tension electric wires with the sun glinting off of them. Sheesh, I don't live on a rocket test range or anything like that.

AT 00:41? LOOK at ...
By: ed4ed. on 02 Feb 11, 20:06:37
AT 00:41? LOOK at the Damn CHEMTRAILS in the Background! AHHHHHHHHHHHHHH!!!!!!!!!!!!!!!

@sjh7132 I think ...
By: wordpresswidget. on 25 Dec 10, 06:16:23
@sjh7132 I think you missed a piece of the example. If you use 2/3 of diameter you are correct. The example shows using 2/3 of the radius (4/3)/2? = 2/3. there is no way using 2/3 of the radius would result in a P larger than that found using the HAWT formula. Did some quick calcs and found an efficiency of 34% relative to Betz (.593 * 25.06 = 14.86) yields an output of P = 5.05 using the 2/3 factor and your provided numbers. This is in line with the experiment in the video.

@wordpresswidget ...
By: sjh7132. on 25 Dec 10, 04:47:28
@wordpresswidget Yes I rounded. I think at the time i was estimating in my head and approximated 6.7 as 7. Yes, breaking Betz is impossible, that's what I'm saying. If I take the measured power of some lenz2 turbines and use the formula for area that you pointed me to, it would sometimes break Betz. If i use the? full area (d * h) Its about 40% efficient.

@sjh7132 first, I ...
By: wordpresswidget. on 25 Dec 10, 01:08:12
@sjh7132 first, I really like the work you're doing and even liked your video. I'm just a stickler for accuracy. So, your math in the video is wrong (ronded?). applying the standard HAWT to your VAWT would yield P = 37.6W .5 * .25 * 1 * 300.763 and >> In fact we've seen VAWTs that would be breaking Betz if you applied that 2/3rds factor? to the area

@wordpresswidget ...
By: sjh7132. on 24 Dec 10, 23:43:03
@wordpresswidget The poster claiming the 2/3rds factor has made many? assumptions. The fact that he made one or two VAWTs and used a little calc doesn't make him an expert. There are many other experts that disagree. In fact we've seen VAWTs that would be breaking Betz if you applied that 2/3rds factor to the area.

You might want to ...
By: wordpresswidget. on 24 Dec 10, 23:19:38
You might want to check out the discussion here fieldlines(dot)com-board-index.php topic 138783.0 it has the calculations (for the most part) needed to figure theoretical power output on a VAWT, which is very different than the calculation for? HAWT; the swept area is figured differently.

@sjh7132 ya know... ...
By: TheTwistedGypsy. on 09 Dec 10, 15:21:41
@sjh7132 ya know....I think your right...hahahaha I have to slow down on my Alex Jones intake ... lol? :-)

@TheTwistedGypsy i ...
By: sjh7132. on 09 Dec 10, 04:59:57
@TheTwistedGypsy i think you are mistaking the sun's reflection off? of some high tension electric wires for chem trails.

damn ! nice wind ...
By: TheTwistedGypsy. on 09 Dec 10, 04:57:53
damn ! nice wind mill, but the hell is up with all the *Chem Trails* were you live.? Thats scary.

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