I fly both nitro and electric. On my Nitro I use NiCads on my electric's I use LiPo's. So how do I convert to use only LiPo's on my Nitro planes? Do I need some sort of voltage regulator to cut down to 6v or 4.8v?

I've heard that I need to buy a 2S lipo not sure of the miliamps? How can I determine the size of the battery needed? For example I'm building a 60 size P-47 Warbird it has 8 standard size servo's and one hight torque retract servo. How would I detertime what size lipo to get?

I use Spectrum recivers typically AR500, AR6200 and AR7000.

My LHS is out of them at the moment and they didnt have a whole lot of info on them.