FCS fin manufacturing - Chinese factory video

[stoneburner]

Regarding the Thrailkill Twingle:

Science behind the Thraikill twin

Bill, I understand that you don’t like the theoretical threads, but this thread is supporting your fin setup!   I did some research on biplanes, very similar to the thraikill twin Main conclusions are Softer stall angle, so very reliable in big waves! Better efficiency at low speeds, but inverse at high speeds. But since Reynolds numbers (a parameter used compare velocities in different fluids) in surfing is an order of magnitude lower than for airplanes, I assume we can co…