Expert: Mark Janus - 6/16/2004

Question
Thom rotors seem to be like Flettner rotors with extra discs along the cylinder. How do their lift characteristics compare to Flettner rotors, and why? Both create lift by spinning using the Magnus effect. Which can produce the most lift for the least power?

Answer
Sorry I've been out for a bit....

I'm not well versed in the Thom vs Flettner rotor topic, but I can tell you the purpose for the extra discs I believe is to reduce spanwise flow.  I would expect a Thom rotor to be more efficient and thus be produce the most lift for the least power....

Thanx,
mj