Are two rotor heads better than one? - Model Airplane News
Controversial Tilt-Rotor Aircraft Deploys to Iraq | WIRED
tandem helicopters
How do helicopters with two rotors operate? - Quora
What Are the 6 Different Types of Helicopters? | Chopper Spotter
Dual rotors could make the Defiant one of the world's fastest helicopters
K-Max Titan: The first commercial heavy-lift helicopter with no pilot
A Lasting Legacy - Vertical Mag
Why are there helicopters with single and double rotors but not quadruple? - Quora
auto rotation - Is it possible to fly a tandem-rotor helicopter after a single rotor failure? - Aviation Stack Exchange
The Osprey: Half-airplane, half-helicopter, totally badass
Bell's helicopter has wings to help it handle high speeds | Popular Science
Platt LePage XR-1A lateral twin-rotor helicopter. (Photograph courtesy... | Download Scientific Diagram
What Are the 6 Different Types of Helicopters? | Chopper Spotter
Twin rotor helicopters hi-res stock photography and images - Alamy
185 Double Rotor Stock Photos - Free & Royalty-Free Stock Photos from Dreamstime
TIL that the two sets of helicopter blades— known as a tandem rotor configuration and most commonly found on the Chinook helicopter— spin in opposite directions, eliminating the need for a tail
First look at ultra-fast Sikorsky/Boeing SB>1 Defiant dual-rotor helicopter
Aerospaceweb.org | Ask Us - Tailless Helicopters and Torque Effect
Kaman K-Max Dual Intermeshing Rotor Helicopter Demo – AIN - YouTube
1/72 scale McDonnell XHJD-1 Whirlaway twin engines helicopter
Back to the drawing board for the future helicopter - BBC Future
