zeeoo
Are you are proposing to develop a gyrocopter, a helicopter, or some form of hybrid?
The selection of; the number of blades, the airfoil, and the means of control, etc. will be very dependent upon this primary decision.
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Prouty has a book entitled 'Military Helicopter Design Technology'. It is significant to note that the chapter 'Missions, Requirements and Desires' is at the beginning.
Dave