[quote]ORIGINAL: OhD

It would be interesting to know exactly how weight affects energy consumed in a typical pattern.




Hi Jim

let me try to answer that question with a power consumation figure i obtained yesterday. i went to the field and wolfgang matt was flying his new 2006 Oxai Beryll. i never tried P07 before so afterwards he coached me trough it. i flew my 20 lbs Raven with NeuMotors 2215/1,5Y 6,7:1 with APC 26 x 15, 10S4P8400 TP's. After the complete flight (which dured 9 min with 7.15 min of engine time above 30% stick), which was in quite hefty crosswinds (and you don't wanna chicken out with THE MAN behind you...), i charged 2450 mAh per 2P-pack, so roughly 5A went up in smoke. That's just 40Ah average consumation in P07 for a 20 lbs plane with a 3,5kW powerplant. And guess how much Wolfgang charged the 10-lbs-Beryll in same conditions: 2500 mAh! So weight has NO AFFECT or no side effect, it's linear: twice the weight, twice the power, and all those lies about the colibri/swan-effect...forget them! at least not in these categories! again, the key is kinetic energy, once those 20 lbs are on the move, you can point them anywhere, they just keep going

cheers

roger