Ya I hear ya. The times I ran my Engines Fox Stunt 35. And usually fly about 2 to 3 minutes. Is about my limit. Hey seen that Super Ringmaster behind that engine. That’s what I am building my Winter project. And repairing my 35 Ringmaster and my Veco Chief. Bought a Toung Muffler. For the Chief going to see how it works out and maybe get one for my other UC planes. Did the Bi Slob last winter. Flew it once. Crazy it’s a great flyer, but I could not get it to hover,! AJ.