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

Contra-rotating, also referred to as coaxial contra-rotating, is a technique whereby parts of a mechanism rotate in opposite directions about a common...

Contra-rotating propellers have benefits when providing thrust in marine applications. Contra-rotating propellers are used on torpedoes due to the natural...

counter-rotating propellers in order to meet air safety requirements under engine-out conditions. Tiltrotor – Aircraft type Contra-rotating propellers –...

with the same axis of rotation, but turning in opposite directions (contra-rotating). This rotor configuration is a feature of helicopters produced by...

Inc, 2008, p. 19. Thumb Twiddling - Contra-Rotating for Fun & Coordination Training, retrieved 2021-10-13 Rotating Fingers in all Different Directions...

although its definition evolved a few years later with the emergence of contra-rotating propfans. In 1986, British engine maker Rolls-Royce used the term open...

with contra-rotating propellers, which eliminated the torque effect. Early problems with the complex gearbox that was required for contra-rotating propellers...

comprises a rotating power-driven hub, to which are attached several radial airfoil-section blades such that the whole assembly rotates about a longitudinal...

electric motor driven by an aluminum silver-oxide (AgO-Al) battery. and a contra-rotating propeller It has a warhead of PBX B2211, range of 50 km (31 mi) and...

allowed handed engines to be made in pairs when needed. It also allowed contra-rotating engines, where the gas generator core and power turbine revolved in...

be contra-rotating. Specification F.1/43 stated that the new fighter was to use a fuselage based on a Spitfire Mk VIII. Three aircraft with contra-rotating...

main ways: First, there is no tail rotor, and the main rotors are contra-rotating. Yaw is controlled by fine adjustment of a differential gear in the...

An airfield traffic pattern is a standard path followed by aircraft when taking off or landing while maintaining visual contact with the airfield. At an...

power plant and propeller vibrations increased, and the very efficient contra-rotating propellers began failing with frustrating frequency. Meetings were...

Bear, powered with four Kuznetsov NK-12 turboprops, mated to eight contra-rotating propellers (two per nacelle) with supersonic tip speeds to achieve...

Yak-46 was a proposed aircraft design based on the Yak-42 with two contra-rotating propellers on the propfan located at the rear. The specification of...

The XFY-1 featured a unique design with delta wings and three-bladed contra-rotating propellers powered by a turboprop engine. Test flights began in 1954...

TG-100s (T31s) in wing nacelles; the D-557B, the same engine, with contra-rotating propellers; and the D-557C, to use the Westinghouse 25D. These were...

300 cm (118 in) fan comes from the Trent 8104 demonstrator, and a contra-rotating HP spool is used for the first time, for up to 2% better efficiency...

[citation needed] It has a distinctive appearance with two large contra-rotating discs mounted in a vertical plane, two crossed bars with metallic brushes...

sea level and 2,500 horsepower (1,900 kW) at 33,000 feet (10,000 m). Contra-rotating propellers were originally a contract design requirement for both the...

turboprop engine composed of two Allison T38 power sections driving a contra-rotating propeller via a common gearbox. The T40 concept originated at Allison...

had a piston engine while the B-88 had a gas turbine driving large contra-rotating propellers. The radar scanner was mounted in a retractable radome in...

helicopters except the Ka-60/-62 family, the Ka-31 has co-axially mounted contra-rotating main rotors. The airframe of the Ka-31 is based on the Kamov Ka-27...

the Kuznetsov design bureau. The NK-12 drives two large four-bladed contra-rotating propellers, 5.6 m (18 ft) diameter (NK-12MA), and 6.2 m (20 ft) diameter...

close-coupled aft-fan module comprising a contra-rotating LP turbine system driving two co-axial contra-rotating fans. Improved materials, and the introduction...

for Royal Navy carrier use, with the addition of an arrester hook, a contra-rotating propeller to eliminate engine torque effects, and power folding outer...

paired with a rotating detonation-dual-mode ramjet (RD-DMRJ). The test came 18 months after program launch. The company reported rotating detonations of...

Wyverns were powered by a turboprop engine driving large and distinctive contra-rotating propellers, and could carry aerial torpedoes. The Wyvern began as a...