Oxyfx, How's it going? I'm flying mine with a 10-7 and am getting plenty of speed with a .46AX in a 7 lb aircraft. There are a few poasts in the Arrow topic, which is basicly a northstar without an elevator. However there is a gentelman who cut a divit into the top of the fuse alowing him to use an 11" prop with great success. Good luck, Bart (man)