Helicopter rotor of gravity fore-aft. However, it requires the expense of two large rotors rather than the more common one large main rotor and a much smaller tail rotor. The Boeing CH-47 Chinook is the most common tandem rotor helicopter. Coaxial rotors are a pair of rotors mounted one above the other on the same shaft and turning in opposite directions. The advantage of the coaxial rotor is that, in forward flight, the lift provided by the advancing halves of each rotor compensates for the retreating half of the other, eliminating one of the key effects of dissymmetry of lift: retreating blade
Helicopter Heroes Helicopter Heroes Helicopter Heroes is a British daytime television series, following the lifesaving work of the Yorkshire Air Ambulance. The first episode aired on 3 September 2007 and a total of seven series have been made. In 2012–13 the team produced a 10 part series called "Helicopter Heroes Down Under", featuring the work of British medics working in Australia. A second, 15 part series is now in production for broadcast in the UK in January 2015. First screened on BBC One in 2007, its first presenter was "Top Gear"'s Richard Hammond. He agreed to front the show to thank the