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2. Coaxial-rotor aircraft - Wikipedia

   en.wikipedia.org/wiki/Coaxial-rotor_aircraft

   A coaxial-rotor aircraft is an aircraft whose rotors are mounted one above the other on concentric shafts, with the same axis of rotation, but turning in opposite directions (contra-rotating). This rotor configuration is a feature of helicopters produced by the Russian Kamov helicopter design bureau .

3. Contra-rotating - Wikipedia

   en.wikipedia.org/wiki/Contra-rotating

   A Soviet Ka-32 helicopter with coaxial contra-rotating rotors, in 1989. Contra-rotating, also referred to as coaxial contra-rotating, is a technique whereby parts of a mechanism rotate in opposite directions about a common axis, usually to minimise the effect of torque.

4. Breguet G.111 - Wikipedia

   en.wikipedia.org/wiki/Breguet_G.111

   A wide track undercarriage has main wheels mounted on horizontal V-struts from the fuselage bottom and with a single bracing strut to the mid-fuselage on each side. [ 1 ] [ 2 ] The first flight was made on 21 May 1949 but tests showed that the G.11E was underpowered, so a decision was made to replace the Potez engine with a bigger nine-cylinder ...

5. Contra-rotating propellers - Wikipedia

   en.wikipedia.org/wiki/Contra-rotating_propellers

   Contra-rotating propellers Contra-rotating propellers on the Rolls-Royce Griffon-powered P-51XR Mustang Precious Metal at the 2014 Reno Air Races. Aircraft equipped with contra-rotating propellers (CRP) [1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra ...

6. Kamov Ka-50 - Wikipedia

   en.wikipedia.org/wiki/Kamov_Ka-50

   Having a coaxial rotor with blades of polymer results in low inertia both relative to vertical and lateral axes, at 50%–75% as compared to a single rotor helicopter with tail rotor. No tail rotor also means it can perform flat turns at all speeds. A maximum vertical load of 3.5 g combined with low inertia makes the Ka-50 highly agile.

7. Undercarriage arrangements - Wikipedia

   en.wikipedia.org/wiki/Undercarriage_arrangements

   2 wheels, 1 axle: Airbus A380 nose landing gear (consisting of a single 2-wheel bogie) 4 wheels, 2 axles: An Airbus A330's main landing gear (consisting of two 4-wheel bogies) 6 wheels, 3 axles: A Boeing 777's main landing gear (consisting of two 6-wheel bogies) 14 wheels, 7 axles: The Antonov An-225's main landing gear (consisting of two 14 ...

8. Tandem-rotor aircraft - Wikipedia

   en.wikipedia.org/wiki/Tandem-rotor_aircraft

   This is commonly accomplished by a tail rotor, coaxial rotors, and the NOTAR systems. Tandem-rotor helicopters, however, use counter-rotating rotors, with each cancelling out the other's torque. Therefore, all of the power from the engines can be used for lift, whereas a single-rotor helicopter uses some of the engine power to counter the ...

9. Sikorsky S-97 Raider - Wikipedia

   en.wikipedia.org/wiki/Sikorsky_S-97_Raider

   Sikorsky's earliest attempt at a fast compound helicopter with stiff coaxial rotors was the Sikorsky S-69 (XH-59A) flown in the 1970s. Its top speed was over 260 knots but its excessive fuel consumption, vibration and complexity requiring the full-time attention of two pilots led to the program's cancellation. [5]