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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.
He had developed a small helicopter model with coaxial rotors in July 1754 and demonstrated it to the Russian Academy of Sciences. [1] In 1859, the British Patent Office awarded the first helicopter patent to Henry Bright for his coaxial design. From this point, coaxial helicopters developed into fully operational machines as we know them today ...
Bevel gears are most often mounted on shafts that are 90 degrees apart, but can be designed to work at other angles as well. [1] The pitch surface of bevel gears is a cone, known as a pitch cone. Bevel gears change the axis of rotation of rotational power delivery and are widely used in mechanical settings. Bevel gear on roller shutter door.
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 ...
Power was transmitted by to the rotors by a set of bicycle pedals powering a set of bevel and pinion gears. [ 3 ] [ 4 ] In 1987, in an article published in the journal Chartered Mechanical Engineer , Cranfield described a series of trials with the Vertigo , the last of which the pilot was able to achieve the 6 rpm necessary for the craft to fly ...
Ground resonance is usually precipitated by a hard landing or an asymmetrical ground contact, and is more likely to occur when components of the landing gear or damping system are improperly maintained, such as the drag hinge dampers, oleo struts, or wheel tire pressure. Under extreme conditions, the initial shock can cause violent oscillations ...
Data from Jane's All The World's Aircraft 1982–83 General characteristics Crew: 1 (optionally 2) Capacity: 6 or 7 pax when passenger module fitted / 2 stretcher patients, 2 seated patients and medical attendant / 900 kg (1,984 lb) pax or liquid chemical / 1,065 kg (2,348 lb) dusting or with platform / 1,100 kg (2,425 lb) with slung load Length: 7.75 m (25 ft 5 in) fuselage Width: 3.64 m (11 ...
Data from Air Progress General characteristics Crew: 1 Powerplant: 1 × Hispano-Suiza 8 V-8 piston engine, 130 kW (180 hp) Main rotor diameter: 16 × 7.2 m (23 ft 7 in) Performance Maximum speed: 13 km/h (8.0 mph, 7.0 kn) Range: 0.736 km (0.457 mi, 0.397 nmi) Demonstrated range See also Aircraft of comparable role, configuration, and era Oehmichen Helicopter Berliner Helicopter de Bothezat ...