Hello there,

I have to make an helicopter drone, with a propulsion system made with two propeler contrarotative (30 cm diameter), co-axe and with a duct.

I want to make optimized blades, for one angular velocity, so i would like to put a swashplate (or something else) for the rotor superior.

For this, i ask here if someone can send me plan of differently rotor heads, or plan of differents systems to change the collective and cyclic pitch (not for a bi-rotor obligatory)

Thank you
Alessandro (France)