I just bought a GMS 40 size motor for my Cessna 182 from Great Planes. The propeller chart for the GMS 40 states I should use a 11x5 prop. I don't have that size and want to fly it this weekend. I do have sizes 11x7-1/2 , 10x8, 11x8, 10x7. The question is, can I get away with one of these. Thanks.