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Swedish police with a Bell 429 A Eurocopter AS365 N3 Dauphin 2 of the Victoria Police Air Wing.. Police aviation is the use of aircraft in police operations. Police services commonly use aircraft for traffic control, ground support, search and rescue, high-speed car pursuits, observation, air patrol and control of large-scale public events and/or public order incidents.
Conventional rotary-wing aircraft use a set of complex mechanical gearboxes to convert the high rotation speed of gas turbines into the low speed required to drive main and tail rotors. Unlike powerplants, mechanical gearboxes cannot be duplicated (for redundancy) and have always been a major weak point in helicopter reliability.
Some rotary wing aircraft are designed to stop the rotor for forward flight so that it then acts as a fixed wing. For vertical flight and hovering it spins to act as a rotary wing or rotor, and for forward flight at speed it stops to act as a fixed wing providing some or all of the lift required. Additional fixed wings may also be provided to ...
Sikorsky S-72 modified as the X-Wing testbed, with experimental 4-blade main rotor. With a single main rotor helicopter, the creation of torque as the engine turns the rotor creates a torque effect that causes the body of the helicopter to turn in the opposite direction of the rotor. To eliminate this effect, some sort of antitorque control ...
Worldwide, over 1,000 autogyros are used by authorities for military and law enforcement. The first U.S. police authorities to evaluate an autogyro were the Tomball, Texas, police, on a $40,000 [28] grant from the U.S. Department of Justice together with city funds, [29] [30] costing much less than a helicopter to buy ($75,000) and operate ($50 ...
Conventional rotary wings as used by modern rotorcraft. Spanwise horizontal-axis. Wing rotor: an airfoil-section horizontal-axis rotor which creates the primary lift. Magnus rotor: a rotor which creates lift via the Magnus effect. Flettner rotor: a smooth cylindrical Magnus rotor with disc end plates.
The Fairey Rotodyne was a 1950s British compound gyroplane designed and built by Fairey Aviation and intended for commercial and military uses. [1] A development of the earlier Fairey Jet Gyrodyne, which had established a world helicopter speed record, the Rotodyne featured a tip-jet-powered rotor that burned a mixture of fuel and compressed air bled from two wing-mounted Napier Eland turboprops.
A police aircraft is a rotary-wing aircraft, fixed-wing aircraft, nonrigid-wing aircraft or lighter-than-air aircraft used in police operations. They are commonly used for traffic control, ground support, search and rescue , high-speed car pursuits, observation, air patrol, riot control, and police tactical unit transportation.