My First Vawt Project

[NoSmoke]

This has been a most interesting topic but, I am left with a nagging question:

All I have seen here seems to emphasize the disadvantages of VATs (fatigue stress, noise, vibration, poor self starting etc.).  I wonder then why not simply go with the ubiquitous, tried and proven 3 blade HAT?? 

I also note that, AFAIK, pretty much all commercial "wind farm" turbines are of the 3 blade HAT type (and I've never seen or heard of any other).

[topspeed]

This has been a most interesting topic but, I am left with a nagging question:

All I have seen here seems to emphasize the disadvantages of VATs (fatigue stress, noise, vibration, poor self starting etc.).  I wonder then why not simply go with the ubiquitous, tried and proven 3 blade HAT?? 

I also note that, AFAIK, pretty much all commercial "wind farm" turbines are of the 3 blade HAT type (and I've never seen or heard of any other).

Are you kidding me...my VAWT has none of those issues ?

It does seem to be handful as a science project to make it exceed betz'z limit for HAWT's.





This is my last attempt with 6th turbine.

[NoSmoke]

Not even the cyclic fatigue stress that is inherent to VAWTs?

And, a VAWT that exceeds Betz??  All wind turbines I've ever heard of don't even come close to equaling Betz.  AFAIK, the Betz limit applies to any wind energy extraction mechanism and VAWTs are no exception(??).

[topspeed]

Not even the cyclic fatigue stress that is inherent to VAWTs?

And, a VAWT that exceeds Betz??  All wind turbines I've ever heard of don't even come close to equaling Betz.  AFAIK, the Betz limit applies to any wind energy extraction mechanism and VAWTs are no exception(??).

Very little as the device creates the energy on a much longer distance of the cycle and is not fixed....so it is not under the specific vibration realm.

It seems to be hard to go laminar whe bigger...the second protoype was.

[Adriaan Kragten]

This has been a most interesting topic but, I am left with a nagging question:

All I have seen here seems to emphasize the disadvantages of VATs (fatigue stress, noise, vibration, poor self starting etc.).  I wonder then why not simply go with the ubiquitous, tried and proven 3 blade HAT?? 

I also note that, AFAIK, pretty much all commercial "wind farm" turbines are of the 3 blade HAT type (and I've never seen or heard of any other).

Good question. To get the answers, read my public report KD 215: "The Darrieus rotor, a vertical axis wind turbine (VAWT, with only a few advantages and many disadvantages" and KD 601: "Ideas about a self starting, 3-bladed H-Darrieus rotor for water pumping".

[NoSmoke]

Just read and thank you - more disadvantages than I was aware of.  That paper and similar information should be a sticky here(?).

[Adriaan Kragten]

Just read and thank you - more disadvantages than I was aware of.  That paper and similar information should be a sticky here(?).

If my reports would be available directly at the website of Otherpower, I loose control about the reviews. If you look at the list with public KD-reports given at my website at the top of the menu KD-reports, you see that I mention the original date of writing the report and the date of the last review. Many reports are reviewed because certain mistakes are corrected or because new chapters are added. So if you copy a KD-report directly from my website, you always get the latest version.