Not to complicate things, but the TT 42 is very reliable, with as good or better power compared to the 46 LA, and no rear-mounted needle. It weighs about 12 ozs, which puts it in the same league, weight wise, with a lot of .25 - .36 size engines, but it will be very happy on an 11 inch prop. Radical RC is a good place to get them. Jim