Counter-rotating propellers (CRP) are propellers which turn in opposite directions to each other. They are used on some twin- and multi-engine propeller-driven...

or spur gear transmission. Although contra-rotating propellers are also known as counter-rotating propellers, the term is much more widely used when referring...

apply. Contra-rotating propellers should not be confused with counter-rotating propellers, a term which describes propellers rotating in opposite directions...

directions even on the same wing. A contra-rotating propeller or contra-prop places two counter-rotating propellers on concentric drive shafts so that one...

have clockwise rotating propellers), the left engine is the critical engine. For aircraft with counter-rotating propellers (i.e. not rotating in the same...

of the PA-24 Comanche single-engined aircraft. A variant with counter-rotating propellers was designated the Piper PA-39 Twin Comanche C/R. The Piper PA-30...

it has counter-rotating propellers on both wings. The propellers on a wing rotate in opposite directions to each other: the propellers rotate from the...

service using a single propeller; only the Soviet-designed Kuznetsov NK-12 and Progress D-27, using contra-rotating propellers, are larger. The TP400...

exerts force on the fluid. Most marine propellers are screw propellers with helical blades rotating on a propeller shaft with an approximately horizontal...

rail Community rail partnership, UK Contra-rotating propellers, with a common axis Counter-rotating propellers, with separate axes Corpus Christi International...

direct-drive propulsion system using concentric counter-rotating propellers. Although counter-rotating propellers produced impressive gains in speed on the...

overwhelming majority of multi-engine propeller driven aircraft where all propellers turn in the same direction. The counter-rotation is achieved by the use...

its unique design feature of outwardly rotating (at the "tops" of the propeller arcs) counter-rotating propellers. Losing one of two engines in any twin-engined...

a crew of three, with a double turboprop engine driving two counter-rotating propellers. On 19 September 1949, the prototype Gannet performed its maiden...

110 km/h. The aircraft uses four brushless electric motors with counter-rotating propellers, which makes the aircraft one of the world's smallest four-engine...

(61 cm) for up to ten seats, with more powerful engines and counter-rotating propellers to prevent critical engine handling problems. The Chieftain was...

conducted in May 2024. Powered by a brushless DC electric motor and counter-rotating propellers using high-energy electrochemical batteries, Akya is able to...

trainer PA-39 Twin Comanche C/R 1970 155 Improved PA-30 with counter-rotating propellers PA-40 Arapaho 1973 3 PA-39 replacement PA-41P 1974 1 Pressurized...

Yakovlev Yak-52. The first attempts at constant-speed propellers were called counterweight propellers, which were driven by mechanisms that operated on centrifugal...

was $3.5 million. The vehicle swam through the water using two counter-rotating propellers, each with 284 kN (65,000 lb (29,000 kg)) of thrust. On 8 May...

difficult. Wind tunnel tests at the NPL established that the counter-rotating propellers caused directional instability with the O/100. Only one version...

would impose higher propeller drag to the detriment of performance in dive bombing. The use of only two counter-rotating propellers on a heavy bomber offered...

structural strength. The propellers envisioned for the completed fighter — unlike the torque-reducing counter-rotating propellers of the V-173 design — were...

same company used opposite rotation reduction gears to provide counter-rotating propellers for twin-engined aircraft, a much cheaper method than designing...

propellers rotating in the same direction are also asymmetric. Counter-rotating propellers avoid this, either by building pairs of engines to rotate their...

experiment in Grenoble) Rotating one or two propellers inside a container; the configuration of two counter-rotating propellers is called the "von Karman...

49. The Model 49 was based on a tri-turbine design featuring counter-rotating propellers within a shroud. Exposed areas were armored to withstand 12.7mm...

The engines were housed in large underwing nacelles and drove counter-rotating propellers to eliminate torque effect with throttle movement. First flown...

called inward turning. Another possibility is contra-rotating propellers, where two propellers rotate in opposing directions on a single shaft, or on separate...

developing a power of 2,300 kW (3,100 hp) at 3,300 rpm, with coaxial counter-rotating propellers. The original record holding Macchi-Castoldi M.C.72 MM.181 seaplane...