thanks a ton. ordering a new engine tomorrow(rossi or jett..still not quite sure heh) for my prop jet. atm all i had laying around to experiement with was a magnum 46 xls and a magnum 52 xls. went with the 46 since it was already broke in and i was in a hurry. after messing with the props i gained a noticable amount in speed after starting with the stock recommended prop and dropping diameter and increasing pitch. with a apc 10x6 was 84 mph.. while not to fast. but working with a magnum 46. im not complaining. in a few days the engine will be back on the shelf and a nice new engine under the cowl.