The evolution props are 10 x 4 but very wide blades. the 40 la lacks the power these props need. I am running one on a super tirgre 45 in a seagull models pc9. It lowered my top speed but seems to work well and like you said you cant beat the looks, it looks very scale on the turbo prop model pc9. good luck to ya Butch in Niagara Falls.