Gee, what a coincidence! I happen to be flying an LT-40 w/TT 46. I started out with an APC 11x5 and it worked GREAT but barely nick the tips on a not-so-smooth landing and they break. I'm now running the MA 11x5. The MA is a little less efficient (some say a LOT less efficient) prop than the APC but holds up to accidental bumps much better than the APC.