On one of the lists recently, or maybe it was a product I read about, anyway the point that stuck with me is the concept of turning the motor over slowly in flight so that the prop is moving through the air without drag. That allows one to use regenerative 'braking' in a way a folding prop would not allow.

M.




On Dec 19, 2012, at 2:58 PM, russell wilson wrote:





hi i forgot yesterday to mention in relation to electric power.....royobi and other manufacturers are making mowers and chain saws 36 v now and are using lithium ion batteries and chargers to suit...i dont think they have power controllers though.(the gnome engine on the focka try plane...red barron....had no speed controller/throttle....it was contrilled when taxing by an on off switch:)
i dont know much about this side of things.
props are generally 80% eficient.
weight devided by glide ratio is a rough calculation for thrust required for level flight.
a large slow diameter prop seems better for low power.
folding prop joints get hammered by single cylender motors.
thats about all i got on this subject.
russ.