rcflyer1970

My Feedback: (212)

Here's a baseline chart I use, make sure you measure from the glow plug to the widest point of the pipe as the exhaust flows (not a strait line) I normally go with the next higher pitch on the prop than I plan on using then trim the pipe a 1/4 inch at a time until there is no more rpm gain, then run the prop with a little less pitch or cut down a bit and see how it performs, if the plane has alot of drag small speed props won't pull it well