Skip. You could be right. But even Danny's Foxes, run hard, seem to be at their outer limit with a Galloping Comedian. A flapless stunter with a thinner airfoil than a Nobler. Probably lighter. Foxes run hard tho, have a surprising amount of power. Noblers were traditionally powered by Fox 35s. What if the Fox 35 was required to run with a muffler? Then again, tongue mufflers don't rob much power. Superfuel or a Superfuel like blend, would probably not generate the required power. In Philly we don't usually run that mix. As you know. We ought to try a Fox on a Barking Nobler. We certainly have plenty of them in our club. Out of curiosity I just weighted a very nice ARF Nobler I bought last year and have not flown. 48 ounces with a Thundertigre 40 in the nose. On the other hand, would a Fox 35 be near optimum. Can it be rung out to its limit and reliably power an ARF Nobler with modern power. Modern power meaning power comparable to a 1980s FP40.