Nine grand is too much. Period. I recently got two DLE 20's for my P-38. Since 3D flying hadn't been invented yet, it wasn't included in the design specifications for the P-38. Therefore I went for speed. The smallest recommended prop size is 14-10. I got a pair of APC's as it is my favorite brand of sport prop. A few minutes into each engine's first tank of gas, they were turning 9400+ rpm. The noise at that rpm was astounding. I never would have believed a gasser that small could possibly make that much noise with the stock muffler. With TWO of them 30 inches apart, the noise was truly oppressive. Needless to say, The balance of the 2 tanks each worth of running the engines got that day was at a setting well below WOT. I've since been told by flying buddies and Tom Denney at ValleyView that anything much over 8000 rpm on the ground is begging for trouble. When I told Tom Denney about it, said he would have the 14-10 prop recommendation removed from his website. Needless to say, those 14-10's will be given away, as I dont have any more glow engines larger than my OS .77VRDF. Please note that at the beginning of this thread, Jody never even bothered to test a 14-10. That should have been my first clue. Jody knew better, I didn't. Tom Denney told me that he and the ValleyView gang have had the best results with this engine propped for rpms in the mid-to-high 7000's. Hopefully I didn't damage my engines, even though I'm still under warranty. I think what may have saved me is that I run a pretty oily fuel mix for the first several tanks on a new engine. My theory is that until I'm fouling plugs, I can't have too much oil for the first several runs. Hopefully sharing my experience will prevent someone from converting one of these little gems into shrapnel.