One of the best parts about dealing with Mark imho - If its needs tweeking after purchase, just send it back and he will hook you up.Here's a list of good starting points for many hulls
http://www.cmdracing.com/updated/prop_picks.htm
The hull you run, how much nitro, if the engine is stock or modified, what pipe you run, atmospheric conditions, and water conditions all have an effect on the proper prop choice for your application. What may be a great prop for someone else's setup may be a poor choice for your application. So expect to buy several props, test, tune, and repeat.
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