HeliHeadspeed is an iPhone app that helps RC helicopter pilots find the proper pinions and motors. Tell it how many cells your battery pack has, how many teeth the pinion has, and your motor's KV, and HeliHeadspeed will estimate the head speed you will achieve.

HeliHeadspeed can also work backwards, recommending a pinion or motor KV based on the head speed you would like to have.

HeliHeadspeed, features a built-in database of popular helicopters so you won't have to search the Internet to find the tooth count on your helicopter's main gear. It's designed to give you answers with as little pain as possible.

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