Those props are for ultimate performance in an aerobatic plane.Personaly,I would still use them in a scale type plane to get the optimum performance out of the engine. I would think a 24x10 would really bog the engine down too much. I also think a 96" Decathalon at 18 lb. will fly very close to "scale like" with the smaller prop.Of course you can try a 24x10 or 24x8 & see how the plane flys.