8cc?? that's about .3 ounces. with that you'd get less than a minute of flight time. I hope you meant 8 ounces.

Anyway, the easy way to find out is to simply run a tank a fuel through the engine on the ground. Restrain the plane so that it can't move and then run a tank of fuel through it at full throttle and time how long it takes to run out of fuel. That will give you a good guideline of how long you can fly on a tank of fuel

Ken</p>