Hi!
A two stroke .46 engine can cope with a lot of prop sizes.
For use in a high winged trainer airplane like a Kyosho "Calmato" a 11x6 or 12x4 is the best prop to use.
The same. 46 engine used in a low winged Q-500 type airplane (130cm in span weighting 1600-1800g)...then use a 9x7, 10x6 or 10x7 prop.
11x10 is way way to much prop for a .46 engine!

Best sport props on the market are RAM, APC and the new Graupner "Cam-prop" or "Sonic" series (not the old blunt tipped grey one).