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

spur gear transmission. Contra-rotating propellers are also known as counter-rotating propellers, although the term counter-rotating propellers is much more...

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

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

and/or length of the blades. For contra-rotating propfans, which can be louder than turboprops or single-rotating propfans, noise can also be lowered...

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

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...

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

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

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...

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...

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...

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

performance was poorer over land. It was also found that the large contra-rotating propellers of the four engines seriously compromised the performance...

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...

was to mount the two engines within the fuselage driving a pair of contra-rotating propellers mounted at the tail in a pusher configuration, leaving the...

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

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

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...

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...

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

Soviet Union. Powered by four turboprop engines, each driving a pair of contra-rotating propellers, the design was the first wide-body transport aircraft and...

called the Tu-114. The aircraft has four Kuznetsov NK-12 engines with contra-rotating propellers. It is the only propeller-powered strategic bomber still...

featured a twin-boom layout with a rear-mounted engine driving pusher contra-rotating propellers. When the XP-59 project was canceled the designation XP-59A...

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...

concepts, eventually developing an advanced compressor design using two contra-rotating stages that improved efficiency. His partner, Hayne Constant, started...

high-wing flying boat with Allison T40 engines driving six-bladed contra-rotating propellers. It had a sleek body with a single-step hull and a slender...

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...

the R-2800 and contra-rotating propellers; the first 26 to be YP-60A with single rotation propeller. With concern that the contra-rotating propellers would...