Double rotor effect on the lift

[mecanique]

Is there someone who know where I could to found a formula about the interraction between two rotor supperposed like the one for the helicpter Kamov.

 

[inventer]

http://www.eaa.org/

the people here can send you where you need to go they have info on just about every flying contraption ever thought of good luck

 

[vorwald]

Stepniewski developed equations for twin rotors in hover. Johnson (page 120) indcates that coaxial rotors required 20% more power due to interference effects.

 

[Intermesher]

This page may lead you to some of the information you are seeking. [

http://www.unicopter.com/0891.html

]

The book 'Principles of Helicopter Aerodynamics' by J. Gordon Leishman probably has the most current 'western' calculations on the co-axial configuration.

Hope this helps.