Search found 58 matches

by topspeed
Mar 19 2022 1:16pm
Forum: Alternative Energy
Topic: World's most efficient wind turbine?
Replies: 32
Views: 1359

Re: World's most efficient wind turbine?

Theoretical maximum efficency of a wind turbine is 16/27 or ca. 59%, this is physic and impossible to surpass (Betz's law) Typical 3 blade rotors are able to reach around 30% efficiency. A wind turbie 5 times better is impossible. In reality this design will have a much lower efficency. The startin...
by topspeed
Feb 20 2022 8:47am
Forum: Alternative Energy
Topic: Looking into small DIY wind turbines.
Replies: 49
Views: 4556

Re: Looking into small DIY wind turbines.

SlowCo wrote:
Feb 13 2022 8:00am
That looks more like wings for a plane then windturbine. :wink:
Curious to see how this turns out.
Yes H-darrieus VAWTs are like this.

Here is the wing tip / winglet.
img_20220216_180129.jpg
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Final aspect ratio will be 8.
by topspeed
Feb 13 2022 6:49am
Forum: Alternative Energy
Topic: Looking into small DIY wind turbines.
Replies: 49
Views: 4556

Re: Looking into small DIY wind turbines.

My wings look like this day before yesterday.
img_20220211_110547.jpg
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by topspeed
Feb 09 2022 7:01am
Forum: Alternative Energy
Topic: Looking into small DIY wind turbines.
Replies: 49
Views: 4556

Re: Looking into small DIY wind turbines.

No they claim 74% of the wind energy into network...that is an exuberant claim. . So they are calculating a theoretical energy input ...swept area, wind speed, air density , etc etc ....at a optimum speed.... ...and then comparing that to electrical energy output ? With no reference to generator ma...
by topspeed
Jan 08 2022 1:58am
Forum: Alternative Energy
Topic: Wind turbine at 1 m/s
Replies: 3
Views: 468

Re: Wind turbine at 1 m/s

1 m/s has very little energy...the gail wind that brought water on the streets of New York was peaking 62 m/s second...that has 37.44 times more energy than 10 m/s wind.
by topspeed
Nov 12 2021 9:08am
Forum: Alternative Energy
Topic: Looking into small DIY wind turbines.
Replies: 49
Views: 4556

Re: Looking into small DIY wind turbines.

Modest developement on my version 4 today of the prototype.

Yellow wing on the back is from the old set up with 1 m shorter moment arm.
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by topspeed
Oct 14 2021 2:55am
Forum: Alternative Energy
Topic: World's most efficient wind turbine?
Replies: 32
Views: 1359

Re: World's most efficient wind turbine?

Chalo wrote:
Oct 13 2021 11:40pm
topspeed wrote:
Oct 13 2021 11:00pm
Chalo wrote:
Oct 13 2021 3:06am
Maybe you should wonder why everybody isn't using their tech.
I know why they aren't using them....it creates 74% only at 5.25 m/s wind.....and has just 10 year warranty for the blades.
One of two conjectures verified.
Which one ?
by topspeed
Oct 13 2021 11:00pm
Forum: Alternative Energy
Topic: World's most efficient wind turbine?
Replies: 32
Views: 1359

Re: World's most efficient wind turbine?

Then there is ANEW which claims 74% efficiency: Try to distinguish between claims, credible claims, and facts. Everything in the alternative energy sector makes much more sense when you do. I am just wondering how a company that has operated since 1989 can advertise 74% efficiency...if it is not tr...
by topspeed
Oct 13 2021 12:42am
Forum: Alternative Energy
Topic: World's most efficient wind turbine?
Replies: 32
Views: 1359

Re: World's most efficient wind turbine?

Then there is ANEW which claims 74% efficiency: Try to distinguish between claims, credible claims, and facts. Everything in the alternative energy sector makes much more sense when you do. I am just wondering how a company that has operated since 1989 can advertise 74% efficiency...if it is not tr...
by topspeed
Oct 12 2021 11:06am
Forum: Alternative Energy
Topic: World's most efficient wind turbine?
Replies: 32
Views: 1359

Re: World's most efficient wind turbine?

59% is the maximum kinetic recovery from ANY wind design. period. Except when you do this: Ducted does capture the air flow and increase the velocity. Many draw backs, size and tracking the wind direction. Not cheap. I have seen some very efficient turbine designed. I have also seen them when they ...
by topspeed
Oct 12 2021 1:42am
Forum: Alternative Energy
Topic: World's most efficient wind turbine?
Replies: 32
Views: 1359

Re: World's most efficient wind turbine?

Hillhater wrote:
Oct 11 2021 10:51pm
topspeed wrote:
Oct 11 2021 1:32am
Big spinner also helps..but has to be counted in capture area as well.

miilun_spinneri.jpg
I have no idea what that is a photo of.......but i am sure it is not a wind turbine ?

Six bladed wind turbine, with adjustable self regulating pitch.

Homemade design.
by topspeed
Oct 11 2021 1:32am
Forum: Alternative Energy
Topic: World's most efficient wind turbine?
Replies: 32
Views: 1359

Re: World's most efficient wind turbine?

ZeroEm wrote:
Oct 05 2021 9:34am
Ducted does capture the air flow and increase the velocity. Many draw backs, size and tracking the wind direction. Not cheap.

Big spinner also helps..but has to be counted in capture area as well.
miilun_spinneri.jpg
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by topspeed
Sep 28 2021 1:12am
Forum: Alternative Energy
Topic: Looking into small DIY wind turbines.
Replies: 49
Views: 4556

Re: Looking into small DIY wind turbines.

No they claim 74% of the wind energy into network...that is an exuberant claim. . So they are calculating a theoretical energy input ...swept area, wind speed, air density , etc etc ....at a optimum speed.... ...and then comparing that to electrical energy output ? With no reference to generator ma...
by topspeed
Sep 25 2021 10:13am
Forum: Alternative Energy
Topic: Looking into small DIY wind turbines.
Replies: 49
Views: 4556

Re: Looking into small DIY wind turbines.

That will be 74% of the theoretical maximum impeller efficiency which is only about 45% so in reality actual efficiency would only be around 30%. I'm guessing that's total efficiency though, electrical output because they wouldn't be making a big deal about it otherwise seeing as you can get over 4...
by topspeed
Sep 24 2021 11:39pm
Forum: Alternative Energy
Topic: Looking into small DIY wind turbines.
Replies: 49
Views: 4556

Re: Looking into small DIY wind turbines.

Small polish turbine factory delivers 74% efficient VAWTs ( only in small winds sadly ). What does this mean exactly ? 74% of max generator capacity in optimum wind conditions ? That is what ANEW company claims of putting electricity into network for their B1 turbine at 5.25 m/s wind. https://www.e...
by topspeed
Sep 23 2021 12:54am
Forum: Alternative Energy
Topic: Looking into small DIY wind turbines.
Replies: 49
Views: 4556

Re: Looking into small DIY wind turbines.

Small polish turbine factory delivers 74% efficient VAWTs ( only in small winds sadly ).

https://www.youtube.com/watch?v=EM-gCvhQhPU
ANEWes1.jpg
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by topspeed
Sep 23 2021 12:48am
Forum: Alternative Energy
Topic: Looking into small DIY wind turbines.
Replies: 49
Views: 4556

Re: Looking into small DIY wind turbines.

I went down this rabbit hole back in 05 and 06. I built numerous prototypes using Delco alternators rewound and fitted with permanent magnets. I got some worthwhile power and would have continued except that during a nasty storm one of turbines disintegrated. One blade went over the house and imbed...
by topspeed
Sep 14 2021 1:30am
Forum: Members' Hobbies and Interests
Topic: Wisdom teeth removal...
Replies: 6
Views: 264

Re: Wisdom teeth removal...

ZeroEm wrote:
Sep 13 2021 9:44am
That is a lot of bone. :cry:
Lot of stitches to stop bleeding...I measured around 500 ml loss of blood.
by topspeed
Sep 13 2021 1:39am
Forum: Members' Hobbies and Interests
Topic: Wisdom teeth removal...
Replies: 6
Views: 264

Re: Wisdom teeth removal...

What was very vicious about it was that it did not hurt...so docs never realized it was the culprit of my total infection spiral. :confused:
by topspeed
Aug 08 2021 4:51am
Forum: Members' Hobbies and Interests
Topic: Wisdom teeth removal...
Replies: 6
Views: 264

Re: Wisdom teeth removal...

And after some further dental deep cleaning and sports I have now lost 18 kg ( 40 lbs ) of my top weight of the spring.
by topspeed
May 26 2021 3:47am
Forum: Members' Hobbies and Interests
Topic: Wisdom teeth removal...
Replies: 6
Views: 264

Re: Wisdom teeth removal...

neptronix wrote:
May 25 2021 12:50pm
wow, pretty heavy tooth. I'd like to see it. :mrgreen:

I am now 10 kilos lighter after some cycling.

Piece of jaw came with it.
IMG_20210520_075924.jpg
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by topspeed
May 25 2021 12:33pm
Forum: Members' Hobbies and Interests
Topic: Wisdom teeth removal...
Replies: 6
Views: 264

Wisdom teeth removal...

I got mine removed about 4 weeks ago...now I am 7 kilos lighter.

I did get rid of a bacteria infection as well.
by topspeed
May 24 2021 12:02am
Forum: Alternative Energy
Topic: Looking into small DIY wind turbines.
Replies: 49
Views: 4556

Re: Looking into small DIY wind turbines.

I am going to build a small scale VAWT out of composite materials with the goal of charging an EV in wilderness areas supplementing solar and standard plug-in charging. My initial plan is as follows. I would love to have comments and criticism and "I've tried that befores." Basic design b...
by topspeed
May 16 2021 1:15pm
Forum: Alternative Energy
Topic: Looking into small DIY wind turbines.
Replies: 49
Views: 4556

Re: Looking into small DIY wind turbines.

Yes hammer is used to belt the 60 cm by 14 mm steel rods into ground. Are you trying to give as little information as possible on your VAWT or what? If it's your little secret then fine, keep it to yourself. I don't understand the point of these weird photos that don't show anything and cryptic one...
by topspeed
Apr 25 2021 5:52am
Forum: General Discussion
Topic: Eternal outskirts of Moscow and beyond (LOTS of pics!)
Replies: 482
Views: 29188

Re: Eternal outskirts of Moscow and beyond (LOTS of pics!)

Well....thanks for the trip to Moscow. :bigthumb: :bigthumb:

Some USSR systems still visible.

But...enjoy while it lasts: https://www.youtube.com/watch?v=nS5_EQg ... bA&index=5