Aeromine, flapless versions

Inspired by Robert Murray -Smith's (@RobertMurraySmith) video 1725. that had opening flaps which point down so air loses energy opening the flap and bouncing around inside to come out the top. These versions address both concerns. I'll try to add a link to the RMS video for reference.    • 1725 Aeromine And A DIY Wind Turbine From ...