If we give you a coaxial helicopter and a hacksaw, will you promise to try and find out by practical testing ? There are many reasons, some obvious (downwash from upper blade destabilizes airflow over lower blade) and some not so obvious (asymmetric impingement of airflow on top of fuselage, Coanda effect).īut coaxial helicopters exist why would a smaller upper rotor be worse? Little propeller engines on, one pointing down andįorward and the other pointing down and backwards, to Helicopter one rotor and little stubby wings with Or have one rotor and make it rotate alternately How about curving the upper blades upwards?Īn egg beater would therefore be more apt name.īut still my subconscious, directs me towards a state change

To control rotation, but would have the beneficial side Propeller (upper) would be adjusted to counter the The helicopter would be controlled with the main Helicopter rotor, but of course have a hollow shaft to The lower rotor would be a fairly standard Very much like a fixed pitch propeller for a fixed wingĪircraft. Significantly smaller, and have it spin faster. Spinning in opposite directions, make the top rotor What I propose is that rather than having two similar Significant separation between the two to avoid rotor Linkage to control collective and cyclic for both Of the main rotor, but have a much more complicated These have theĪdvantage of not needing a tail rotor to counter the

Top rotor is smaller and faster than the bottom rotorĬoaxial rotor helicopters have two rotors: one above the Halfbakery: Asymmetric Coaxial Rotor Helicopter

Zipster coaxial helicopter