Tandem-rotor aircraft
Videos
A tandem-rotor aircraft is an aircraft with two large helicopter rotor assemblies mounted one in front of the other in the horizontal plane. This configuration is mainly used for large cargo helicopte
Boeing Vertol CH-46 Sea Knight
Columbia Helicopters Boeing Vertol 107-II and Boeing 234
A Piasecki H-21B in the early 1960s
A Yakovlev Yak-24 at Central Air Force Museum
NOTAR
Videos
NOTAR is a helicopter system which avoids the use of a tail rotor. It was developed by McDonnell Douglas Helicopter Systems. The system uses a fan inside the tail boom to build a high volume of low-pr
MD Explorer air ambulance
The Cierva W.9 showing the long tailboom from which the efflux from the engine-driven fan emerged from a directable vent on the left side at the tip of the tailboom
MD 900
MD Helicopters 520N NOTAR