I use this on my RV 4 http://www3.towerhobbies.com/cgi-bin...9&I=LXBC35&P=K
I cut the cowl part off and run the wires through a switch. I have a 1.2 volt 2700 mah nicad battery. I just use it for starting and it works great. Very light in my opinion. Also keeps your hands away from the prop.

chopper