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Time between overhauls (abbreviated as TBO or TBOH) is the manufacturer's recommended number of running hours or calendar time before an aircraft engine or other component requires overhaul. [1] On rotorcraft, many components have recommended or mandatory TBOs, including main rotor blades, tail rotor blades and gearboxes. [2]
The forward rotor is larger in diameter than the rear rotor, to avoid problems with eddies from the forward rotor tips. The rotors are powered by the engine shaft via an epicyclic gearbox. The rotors produce a large amount of heat. In late 2008, the RB3011 was considered a contender for the powerplant of the Irkut MS-21. Rolls-Royce felt it ...
A propfan, also called an open rotor engine, open fan engine [1] [2] or unducted fan (as opposed to a ducted fan), is a type of aircraft engine related in concept to both the turboprop and turbofan, but distinct from both. The design is intended to offer the speed and performance of a turbofan, with the fuel economy of a turboprop.
Engine designers had always been aware of the many limitations of the rotary engine, so when static style engines became more reliable and gave better specific weights and fuel consumption, the days of the rotary engine were numbered. Rotary engines had a fundamentally inefficient total-loss oiling system. In order to reach the whole engine ...
The RISE has a tractor configuration with the rotor at the front of the engine, unlike the pusher configuration of those other engines. [1] The single-rotating design had previously been validated by the IRON project as part of the Clean Sky 2 program, [ 7 ] and GE had dubbed the concept as the Unducted Single Fan (USF) engine. [ 11 ]
WASHINGTON (Reuters) -The head of European planemaker Airbus said novel open-rotor technology being tested by engine maker CFM International offers promising efficiencies and reductions in ...
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