RE: GP Supersportster EP with lipos?
The reason I used a Kyosho Magnetic Meyhem in my Electrostreak is that the stock motor is marginal. This was a $20 upgrade and well worth the money. I have this SuperSportster EP also, but it's still in the box. Too many planes. The kit comes with a 2100MAH NiCd. Have you tried flying with the supplied battery? I got my hands on a reverse wind Magnetic Meyhem and intend to replace the stock motor with it. Reverse wind because of the gearbox. Mine will be flying with the supplied battery and a 2400 and two 1900 batteries that I have.