Tx Bird yes valid concerns. I'm basing this on that the rcgf 15cc can swing a 13-8 at 11000 rpm. Based on Kinverflyer's SC0.70FS turning an APC 13x7 at about the same rpm I think it would work. With ignition and muffler, the 15cc weighs 6.6oz more than the .70FS so I'm hoping to make this up with a 2-3 oz fuel tank and use micro metal gear servos. It should be a fun design challenge.
The whole system will run on a 5.5 oz A123 battery with an IBEC. Stay tuned ...