As a matter of fact I have a Topflite 1/5 P-51 ARF sitting about 5 feet away from me right now waiting for it's maiden and yes I looked long and hard at putting the Q42 in it, but chickened out after reading a lot of reports that it was marginal power. I opted for the Brison 2.4, as I said 1 lb. lighter and 8000 on a 18-10 instead of 7000.