Originally Posted by flylow2011
The difference in amp draw could caused by high/low timing, exhaust diameter, ducting ... or the accuracy of the meter .....
How long can you stay in the air with that 3000mah pack? thx.
the 2W-20 is used with 3s lipo packs.
3s, 10blade 70mm fan, draws about 55amps
Amp draw was 30 Amps with a minifan
My usual flight time is a little over 3 min, with around 30-40% time at WOT.
I usually put about 2000mAh back to the pack.
30A for 2w20, 3s with a minifan is more in line with my expectations,
when compared with a report of 45A for 2w20, standard 4s setup with the minifan:
However, I think James' numbers are just as valid, given timing and all other variations you outlined above. All these tests confirm that the CS-10 is very sensitive to battery/motor/timing/etc combinations. As long as a motor is not over-driven at the intended power level, the system can be quite efficient. Once a motor is driven pass some power level threshold, the efficiency with the CS-10 will fall off the cliff.