I've been researching about helicopter flight without a tail rotor and the closest I've found is intermeshing rotors or this: https://www.quora.com/Why-dont-helicopters-have-rotor-blades-at-the-bottom

Looking at this new method:

Seen in this frame, the rotors are single winged and I'm guessing they rotate at opposite phases. What is this called and where can I find more information about it?


You are right, the two rotors move in opposite direction. This is called a co-axial rotor and is used by the Russian helicopter design bureau Kamov. A co-axial rotor can also be found on many model helicopters for indoor flying. They are a subspecies of helicopters with contra-rotating rotors.

Helicopters with contra-rotating rotors do not need a tail rotor and are much easier to fly than Sikorsky-type helicopters, because they suffer much less from instability. This group also comprises intermeshing rotors like those used on Flettner or Kaman K-Max helicopters.

Kamov Ka-32

Kamov Ka-32 with co-axial rotors operated by HeliSwiss (picture source)

Kaman K-Max modified as an unmanned vehicle

Kaman K-Max with intermeshing rotors modified as an unmanned vehicle (picture source)

For more info, just follow the links.


Not the answer you're looking for?Browse other questions tagged or ask your own question.