Sunfm,

There is another way... by changing your prop sizes you can extract more or less amps from a plane.

The way to figure this out is start with the takeoff weight of the aircraft - 6lbs according to manual.

Factor in enough power to fly = 75w/lb would be heaps for this kind of aircraft - so 6x75W = 450w.

Now, assume the voltage based on batteries you own - 11.1v, and derive current 450/11.1 = 40A - so if you have a 3s LiPo that can deliver 40A burst (and so 30A continuous) then you can fly this bird on a 3s pack.

Now you just need to find a prop that will achieve this - 11x7 is the stock prop, so maybe going to a 12x8 as the first step. You might even need to set up to 13" (although you need to start being careful about ground clearance).

Anyway, the point is this - just cause they say you need such a such a battery voltage isn't necessarily true - by varying your props you can suit different voltages (like putting to 3s Lipos together in series would deliver 22v, meaning you would only need to draw 20A - you could probably step down to a 9x6 or maybe even an 8x6...

Get the idea?

Cheers,
oz.