Author Topic: H-Darreius wind turbines ( VAWT ) ! (Read 76131 times)

topspeed · « **Reply #198 on:** March 14, 2022, 07:43:17 AM »

I counted that this blade/wing has same aspect ratio than the Bald Eagle.

https://avianreport.com/bald-eagle-wingspan-versus-birds-prey/

I reckon it is even steven 8.

MattM · « **Reply #199 on:** March 14, 2022, 08:12:56 AM »

Even if your project fails to hit your metrics, you definitely win my vote for Best in Show.

Once again you prove your unmatched craftsmanship.

DamonHD · « **Reply #200 on:** March 14, 2022, 12:27:58 PM »

Agreed. Fab fab skills! Wish I had some!

Rgds

Damon

topspeed · « **Reply #201 on:** March 14, 2022, 01:05:47 PM »

Wow !

I thank you Astro, Matt and Damon !

I try my best now since I know these take a lot of time to tune everything...the summer here is short...and the world needs clean energy.

topspeed · « **Reply #202 on:** March 29, 2022, 03:41:59 PM »

Some advancement.

SLAVA UKRAINI !

topspeed · « **Reply #203 on:** April 23, 2022, 04:52:55 AM »

I found this very informative: https://link.springer.com/article/10.1007/s40095-014-0129-x

MattM · « **Reply #204 on:** April 24, 2022, 04:43:45 PM »

So its basicallt saying shorter and wider is better due to a combination of less drag and better leverage. I'd be worried about breaking the sound barrier if you get too wide. Some of those barrel-based VAWT drag units already approach 500 rpm in 40 mph winds. I'd hate to see those aerofoils hitting four times that.

topspeed · « **Reply #205 on:** April 27, 2022, 02:06:13 PM »

This Agile Wind VAWt was interesting.

It broke at 20 m/s.

https://www.agilewindpower.com/en

https://www.verve.vc/portfolio/agile-wind-power/

topspeed · « **Reply #206 on:** May 05, 2022, 07:02:54 AM »

Winter still here...snowed yesterday.

I have to use ( a lot of ) filler to make this aerodynamic shape work.

topspeed · « **Reply #207 on:** May 13, 2022, 05:18:18 AM »

All these mishaps are due to scaled up size and sweeping the wings.

I ought to have used more wing foils, but I have to patch up all disruptions in aerodynamic flow. Otherwise this whole enterprise is completely useless.

I used here saw cutter and D3 glue to patch the two wing tips were the alignment of the plies was wrong.

All these will end up in more weight and worse efficiency, but ...I have to try this now.

topspeed · « **Reply #208 on:** June 09, 2022, 07:21:34 AM »

I am ready now...looking for a funding.

SparWeb · « **Reply #209 on:** June 09, 2022, 11:02:15 PM »

I can't wait!

JW · « **Reply #210 on:** June 30, 2022, 06:21:47 PM »

Wow this feature is working. super happy.

topspeed · « **Reply #211 on:** July 11, 2022, 03:36:36 AM »

Short update:

I have made so far 2 attempts to run the 4th prototype.

First attempt was made in early June...and 16 items were missing.

Second yesterday..very close one..only the tool used to tighten the wings was not able to move the needed 1/6 rotation inside the wing.

I have to do some readjusting to it to make it work.

Mary B · « **Reply #212 on:** July 11, 2022, 01:11:31 PM »

They make ratchets that are short stroke... just for that type of need. I make sure to have one in 3/8 drive just in case.

topspeed · « **Reply #213 on:** July 11, 2022, 03:45:33 PM »

Quote from: Mary B on July 11, 2022, 01:11:31 PM

They make ratchets that are short stroke... just for that type of need. I make sure to have one in 3/8 drive just in case.

I gotta get me one tomorrow...thanks Mary B.

topspeed · « **Reply #214 on:** July 12, 2022, 06:18:05 AM »

Okay...here we go..this one left is 47% thinner where it counts most....and gets the job done.

SparWeb · « **Reply #215 on:** July 13, 2022, 01:41:29 AM »

Careful not to let this happen to you:

topspeed · « **Reply #216 on:** July 14, 2022, 09:49:05 AM »

That was a good one.

I was in the Shark Island and the owner of the beach where I was came by to say that looks like a hard sort of sport.

It sorta is...I have tinkered now 8 years on my device...and I haven't actually received anything from this.....but lost time and money.

Crockel · « **Reply #217 on:** July 16, 2022, 04:28:29 PM »

Time and money is a pretty common cost of tinkering. Unless I can find a practical application for stuff I build, it doesn't get made or it gets made from junk I have laying around.

topspeed · « **Reply #218 on:** July 16, 2022, 10:41:39 PM »

Quote from: Crockel on July 16, 2022, 04:28:29 PM

Time and money is a pretty common cost of tinkering. Unless I can find a practical application for stuff I build, it doesn't get made or it gets made from junk I have laying around.

I don't mind the tinkering, but I am afraid all this works gets blown into wind...if the workman ship or the low Re-number won't take me where I am trying to be.

JW · « **Reply #219 on:** July 17, 2022, 12:05:08 AM »

Man once the main pump is primed there you go- can pressurized "we can make steam"

JW · « **Reply #220 on:** July 17, 2022, 12:19:36 AM »

I want to upload video "to the forum" we can have our own youtube here

We need TechAdmin to get a way with this.

JW · « **Reply #221 on:** July 17, 2022, 01:27:07 AM »

There were some critical moments there, but now solid applications

we need to push TechAdmin on this I want to post video on the site.

MattM · « **Reply #222 on:** July 17, 2022, 07:18:46 PM »

Your technical demands jump quite a lot with video. It will take all the previous bandwidth used for the month to serve a 5 minute video at 4k. And unless you have robust hosting, that video experience will suffer from serious buffering. Early video hosts had a lot of challenges to overcome.

TechAdmin · « **Reply #223 on:** July 21, 2022, 06:58:26 PM »

@topspeed Tempted to give you "Clampmaster" as custom title, you surely earned that and a few others, including blade crafter and such

@JW it's best to post videos to YouTube, as unlisted if people want, then link them from here. 3 reasons for this: 1) Storage (videos are heavy on storage) 2) Bandwidth (same, but bandwidth is more expensive than storage) 3) technical reasons (not many of those systems around and we will have to do a giant update in some time anyway, I'll bring it up in admin board sometime).

JW · « **Reply #224 on:** July 22, 2022, 02:29:17 AM »

Changing an alternator on this Buick today, was going to hot swap it. But will disconnect the battery its in the trunk. Surprised at the batt capacity. there is a tonn of electronics ,better to disconnect the bat.

topspeed · « **Reply #225 on:** August 11, 2022, 02:44:05 PM »

This project is taking me to funny roads...I mean I just got me an old ( practically for free ) V-8 powered Chevy Van...just to be able to get it to nature for the tests.

topspeed · « **Reply #226 on:** August 14, 2022, 03:36:52 AM »

Quote from: topspeed on August 11, 2022, 02:44:05 PM

This project is taking me to funny roads...I mean I just got me an old ( practically for free ) V-8 powered Chevy Van...just to be able to get it to nature for the tests.

I had to give up on than Chevy...too risky at 180 000 miles on the meter. It would have been perfect with solar panels and chemical toilet.

MattM · « **Reply #227 on:** August 14, 2022, 06:32:14 PM »

Quote from: topspeed on August 14, 2022, 03:36:52 AM

Quote from: topspeed on August 11, 2022, 02:44:05 PM
This project is taking me to funny roads...I mean I just got me an old ( practically for free ) V-8 powered Chevy Van...just to be able to get it to nature for the tests.

I had to give up on than Chevy...too risky at 180 000 miles on the meter. It would have been perfect with solar panels and chemical toilet.

If it was well maintained then it had another 180 left.

topspeed · « **Reply #228 on:** August 15, 2022, 12:09:15 AM »

Quote from: MattM on August 14, 2022, 06:32:14 PM

Quote from: topspeed on August 14, 2022, 03:36:52 AM
Quote from: topspeed on August 11, 2022, 02:44:05 PM
This project is taking me to funny roads...I mean I just got me an old ( practically for free ) V-8 powered Chevy Van...just to be able to get it to nature for the tests.

I had to give up on than Chevy...too risky at 180 000 miles on the meter. It would have been perfect with solar panels and chemical toilet.
If it was well maintained then it had another 180 left.

Yes the owner said it consumes 26 liters/100 km when pulling a trailer. It is still an option...I just have to use my old car with a roof rack...which is not very reliable system.

Bruce S · « **Reply #229 on:** August 15, 2022, 08:29:58 AM »

I'm with MattM on this one!
Check the engine numbers, see if it's a 4-bolt main style, if there's no tick tick tick when you rev-up the the engine then you're pretty much assured it's okay.

What sized V-8? small block of big block?

My 1970 Chevy Impala lasted through 201K small block 350 4-bolt main with a 4-barrel carb (4-barrels actually got better mileage due to small primaries).

Cheers
Bruce S

electrondady1 · « **Reply #230 on:** August 15, 2022, 09:39:07 AM »

i have 350 chev 4 bolt main on my engine stand. wanting to rebuilt it ( yea , when i get the chance).

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Author Topic: H-Darreius wind turbines ( VAWT ) ! (Read 76131 times)