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The Canadians make a very small open seat single helicopter called a "Mosquito". It is a single place and open seat . It uses a 27Klg(60lbs.) Zozerottera Italian engine, that produces 60 horse power. There are so very many variables that determine needed horse power that the question it's self have many different possibilities, Weight, density altitude, rotor design and length all factor in, but it looks like anything down to about 40HP could fly.

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Q: What is piston engine HP needed for a single-seat helicopter?
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