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  1. Dart replied to the thread Fauceted Wind Turbine, Reynolds number advice please.

    Looking at the data it seems they are using a different set of measurements to create the 70% number, and it's interesting that they...

    Jul 16, 2019 at 8:35 PM
  2. Dart liked bmcj's post in the thread Fauceted Wind Turbine, Reynolds number advice please.

    Stick with the oil. It offers easy flow and visibility. It might be best if you can apply the oil while it is spinning and look at it...

    Jul 16, 2019 at 6:21 PM
  3. Dart replied to the thread Fauceted Wind Turbine, Reynolds number advice please.

    I agree, and the easiest access to that Data is to google "A VAWT retrospective" published by NREL in maybe 2005, where they go over all...

    Jul 16, 2019 at 6:11 PM
  4. Dart replied to the thread Fauceted Wind Turbine, Reynolds number advice please.

    Thanks so much for this link! I've been saying that the Betz is not properly applied to VAWT's since about 2006. I'm not really...

    Jul 16, 2019 at 6:02 PM
  5. Dart liked Speedboat100's post in the thread Fauceted Wind Turbine, Reynolds number advice please.

    Errr...you might be surprised but at least 4 universities have counted that 59,3 % is only valid on HAWT propellers..VAWTs can exceed...

    Jul 16, 2019 at 5:50 PM
  6. Dart replied to the thread More of my random designs.

    I agree Sockmonkey, there's many developments that stalled for reasons unrelated to the technology, and are now considered technological...

    Jul 16, 2019 at 1:21 AM
  7. Dart liked Sockmonkey's post in the thread More of my random designs.

    I have plenty of normal stuff. Open top Hatfield in war paint. The Little Bird is a proven design. [IMG] Use a pontoon from a bigger...

    Jul 16, 2019 at 1:09 AM
  8. Dart liked Tiger Tim's post in the thread More of my random designs.

    I believe you guys are thinking of the Sea-Era.

    Jul 16, 2019 at 1:08 AM
  9. Dart replied to the thread Fauceted Wind Turbine, Reynolds number advice please.

    This video is really just a preview, I'll make more and post more details once I've done some testing and can make a good comparison...

    Jul 16, 2019 at 1:08 AM
  10. Dart replied to the thread Fauceted Wind Turbine, Reynolds number advice please.

    Thanks, I agree it doesn't look like a conventional wing. One big difference between what I've found works, and anemometers, is that...

    Jul 15, 2019 at 9:21 PM
  11. Dart liked BBerson's post in the thread Fauceted Wind Turbine, Reynolds number advice please.

    Your device looks more like an extended rotating cup anemometer than a wing. Using drag, not wing lift....

    Jul 15, 2019 at 9:15 PM
  12. Dart replied to the thread Fauceted Wind Turbine, Reynolds number advice please.

    Thanks for the suggestion Hot Wings! I am going to start testing soon, and I will try this. I've heard of people using different...

    Jul 15, 2019 at 7:10 PM
  13. Dart liked Hot Wings's post in the thread Fauceted Wind Turbine, Reynolds number advice please.

    Toss some dirty oil on it and see what direction the resulting pattern says the air is flowing over the surface? From this you can then...

    Jul 15, 2019 at 7:06 PM
  14. Dart replied to the thread Fauceted Wind Turbine, Reynolds number advice please.

    I'm sorry if I miscommunicated, the 59.8% limit was calculated by someone far more knowledgeable than me, I think in the 1930's. Dr...

    Jul 15, 2019 at 7:05 PM
  15. Dart liked proppastie's post in the thread Fauceted Wind Turbine, Reynolds number advice please.

    an aircraft prop is up to 80% efficient a the proper rpm/angle (I think). So you claim much smaller numbers for windmills

    Jul 15, 2019 at 6:59 PM
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