thanks guys for thebattery mounting tip. I just maidened my new Skybolt! I have an OS .91 2 stroke with JR electronics. I added the Sig tail wheel and I am using 2 elevator servos instead of one. I needed 1/2 lb of nose weight with the battery in the middle of the plane. I am looking forward to moving the battery forward and getting rid of the lead. What prop are you guys spinning with my engine setup? I flew with a 15-8 tonight. The book for the motor doesn't list a 2 bladed prop smaller than 15". The write up on Towers site lists about 10 props all the way down to 12 or 13 ". They recommended a 13-8.. Any comments?