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
Defence Helicopter Flying School devices (provided by CAE Inc.) and two virtual reality trainers and a mock Chinook cabin. All aircrew instruction is carried out by Central Flying School (Helicopters) (CFS(H)) Instructors. These Instructors are a mix of military and civilian personnel personnel. The DHFS uses grass airfields at Ternhill and Chetwynd for helicopter training, both are located in Shropshire. Defence Helicopter Flying School The Defence Helicopter Flying School is a military flying school based at RAF Shawbury in Shropshire, England. The school is a tri-service organisation and trains helicopter aircrews for all three British armed forces, using the Airbus Juno HT1 and Airbus