I use simmitar 17x8 on a GP giles, the combo is around 12,5 lbs. and it rocks !
this engine has the power to fly a 15 pounder easy but it is a thirsty engine, it goes thru a 1/2 galon every 4 flights ! I guess that is why people go to gas and that is why I do not fly it often, here in Los Cabos you pay 70-80 dollars per gallon if you have no one to bring it by land from the states !