Amazon.com: GoolRC C127 RC Helicopter with 720P Camera, 4 Channel Remote Control Helicopter, 2.4GHz RC Aircraft with 6-Axis Gyro, Optical Flow Positioning, One Key Take Off/Landing and 2 Batteries for Kids Adults :
Have any other countries built a twin rotor helicopter like the Chinook? If so, was it successful? - Quora
CH-47 CHINOOK IS A TWIN-ENGINE, TANDEM ROTOR HEAVY-LIFT HELICOPTER. - YouTube