I ran my blast with a lehner basic 4200 today this motor was way too powerful for the blast. I ran with a 31 mm prop which is smaller than the stock prop. The 4200 can out rev a 12turn p94 that I have unloaded. When my blast got on plain when I fully pull my throttle on my pistol the blast made a violent role over then role back over. It appeared that the hull was resisting speed it made some violent jumps.