ORIGINAL: All Day Dan
My 40cc engines use 1.5 ounces per minute. You would be cutting close with a 12 ounce tank. Dan.
Dan, I would be running each engine on their own tank. If your 40cc uses 1.5, then 20cc should .75ish. 12oz by .75 should be 16 min.I shooting for 7 mins flying time.Thanks for your Input.