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The Allison Model 250, now known as the Rolls-Royce M250, (US military designations T63 and T703) is a highly successful turboshaft engine family, originally developed by the Allison Engine Company in the early 1960s. The Model 250 has been produced by Rolls-Royce since it acquired Allison in 1995.
To meet an Italian Army requirement for a short take-off liaison aircraft, SIAI-Marchetti modified the design of the Cessna 305A/O-1 Bird Dog with a new turboprop engine and a revised tail unit. The prototype first flew on 24 May 1969 powered by a 317 hp (236 kW) Allison 250-B15C turboprop engine.
One of Allison's most successful projects is the Model 250 turboshaft/turboprop engine family, which was started by the company in the early 1960s, when helicopters started to be powered by turbine, rather than reciprocating, engines.
Early models were powered by a Rolls-Royce-Allison Model 250-C18 gas turbine producing a claimed 320 hp (240 kW) at 52,000 rpm. [3] Unlike some turbojet -powered motorcycles which relied on jet propulsion for thrust, the Y2K Superbike's turboshaft engine drives the rear wheel via a two-speed gearbox and chain and sprocket.
Allison T703 (Allison 250) Allison TF32; Allison TF41 (development of Rolls-Royce Spey) ... Bristol BRJ.1 6in ramjet, Initial development model using Boeing combustor.
The first production model, powered by two Allison Model 250-C20 turboshaft engines. It made its first flight on 4 August 1971. Initially, the A109 was marketed under the name of "Hirundo" (Latin for the swallow), but this was dropped within a few years. A109A EOA Military version for the Italian Army. A109A Mk.II
Data from Jane's Aircraft Recognition Guide General characteristics Crew: 2 Length: 8.4 m (27 ft 7 in) Wingspan: 10 m (32 ft 10 in) Height: 2.9 m (9 ft 6 in) Wing area: 16.5 m 2 (178 sq ft) Airfoil: root: NACA 23016.5 ; tip: NACA 23012 Empty weight: 1,082 kg (2,385 lb) Max takeoff weight: 1,805 kg (3,979 lb) Powerplant: 1 × Allison Model 250-B17D turboprop, 261 kW (350 hp) Propellers: 3 ...
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