Hi

Am having problems with under power with my Potensky eagle as well. I am using the stock motor and ESC with a li-ion 2cell 7.2v 1400mah battery and it just barely climbs. What will be a better battery to use with the stock motor to get a decent performance possibly hover?

I don't know the answer, but you might find something useful here http://www.gregcovey.com/aerobati.htm

scroll to the bottom. Be sure to check the links he has to E-Zone near the bottom as well.

One of the cheapest ways to get a better climb is to go to a bigger prop with less pitch. You could try something like a 10x4.7.

I am using a 10X4.7 at the moment. I will try a 10X7 see if I get a better performance. the rpm just wont go above 4700 and the spec of the motor says 5600