Re: " If you were getting 11,000 on the ground, then I guaratee you were getting over 12000 in the air. " < The EVO ads indicate that they will get 12,000 on the bench with an APC 12-6 prop. Since this is not unreasonable for a strong engine in this size range then that what I expected to see with my tach. Jett does the same thing, tells you what rpm you should get with a specific prop on the bench. He goes one better and also guarntees that if you don't get that rpm, then he wants to hear about it! Lowlevlflyer, I am going to re mount the Evo 61 on my Kaos 60 and try to find out what is going on. The Kaos makes a great test bed because it can handle high speed flight with a strong engine or float in like a trainer if the engine dies. I may remove the stops so that I have better control of the settings. [8D]