RE: engine starts backwards
I'm not positive but i think tower makes a 11x5 plastic prop for their 46 OS FXI for their nexstar engine that runs very well.
http://www2.towerhobbies.com/cgi-bin...&I=LXGAK9&P=ML
10 by 7 pusher
http://www2.towerhobbies.com/cgi-bin...?&I=LX1500&P=7