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Feathered propeller on the outboard TP400 turboprop of an Airbus A400M. On most variable-pitch propellers, the blades can be rotated parallel to the airflow to stop rotation of the propeller and reduce drag when the engine fails or is deliberately shut down. This is called feathering, a term borrowed from rowing. On single-engined aircraft ...
The TP400 large propeller would still have enough ground clearance with the engine installed on the A340 low-mounted wing. [13] A400M showing its counter-rotating propellers on each wing. A small difference in the propeller gearboxes is required to make them go in opposite directions, namely the addition of an idler gear in two of them.
The auto feather system also allows pilots to reduce the drag of the propellers during an engine failure, therefore, allowing the plane to glide for a longer period of time. An automatic feathering system was first introduced on the Martin 4-0-4 aircraft, a piston engine airplane. The system was designed to automatically feather an engine that ...
The Airbus A400M Atlas [nb 1] is a European four-engine turboprop military transport aircraft. It was designed by Airbus Military , now Airbus Defence and Space , as a tactical airlifter with strategic capabilities to replace older transport aircraft such as the Transall C-160 and the Lockheed C-130 Hercules . [ 3 ]
In a multi-engine aircraft, if one engine fails, it can be feathered to reduce drag so that the aircraft can continue flying using the other engine(s). In a single-engine aircraft, if the engine fails, feathering the propeller will reduce drag and increase glide distance, providing the pilot with more options for the location of a forced landing.
A propeller blade in feathered position. In aeronautics, blade pitch refers to the angle of the blades of an aircraft propeller or helicopter rotor. Blade pitch is measured relative to the aircraft body. It is usually described as "fine" or "low" for a more vertical blade angle, and "coarse" or "high" for a more horizontal blade angle.
Figure 2. A400M, counter-rotating propellers on each wing; the most important yawing moments after failure of engine 1. If an outboard engine fails, such as engine 1 as shown in Figure 2, the moment arm of the vector of the remaining thrust on that wing moves from in between the engines to a bit outside of the remaining inboard engine.
The first engine run with propeller took place in 2006, with the first flight of the TP400 aboard a testbed taking place in 2008. The first flight of the A400M took place in 2009. [10] Two years later the TP400 engine received EASA certification. [11] The first engines were delivered in 2012. The French Air Force began using the A400M in 2013. [4]