Hammer,Don't get caught in the high nitro trap. I run 40% redmax, 450 octura prop. runs as fast as anyone in our district. Now the big plus... CONSISTANT...CONSISTANT...CONSISTANT! The boat just runs and runs. I actually have two boats. One is a boat I bought from Jerry Dunlap and one is a wood dumas sprint. They both run fast and very consistant no matter what pond we run at. Try it. It works. Bob Tuttle B)