It's funny how with 2 strokes most guys want to up the nitro when in fact when correctly set up an engine can make just as much power with low nitro if the engine is designed for it. I remember when the ultimate pylon racers were F1. 60% nitro and a plug per run were the norm. The rest of the globe were going just as fast with zero nitro. Makes me feel,a little silly to admit that the racing I currently do is based on YS 4 strokes running up to 60% nitro. Last weekend I ended up straying from my formula of running a max of 30% and pumped in some 55% nitro. Any idea how much an engine shakes with only half a 14x13.5 at 10K. Got it on the ground but still need to toss the airframe. If you care to see the video do a web search for Unlimited race at SCCMAS on Oct 4.