needing Helicopter design or aerodynamics books

[SpaceCofee]

Hi guys

I need some reference about helicopter design or aerodynamics.
help me.

[C. Beaty]

"Aerodynamics of the Helicopter"

http://www.cgpp.com/heliaero.html

[Rotor Rooter]

If the book recommended by Beaty arouses your interest and you want to go deeper into the subject; Helicopter Theory by Wayne Johnson and Rotor-Wing Aerodynamics by W.Z. Stepniewski & C.N. Keys are excellent low cost books.

Here is a list of technical helicopter related books. Source of Information
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Alternatively, if you want to start looking at rotorcraft with a clean slate and an open mind; This is the place to start.

[SpaceCofee]

Dear C.Beaty and Rotor Rooter Thank you for helping.