| 词条 | Rolls-Royce Goshawk | |||||||||||||
| 释义 |
The Rolls-Royce Goshawk was a development of the Rolls-Royce Kestrel that used evaporative or steam cooling. In line with Rolls-Royce convention of naming piston engines after birds of prey, it was named after the goshawk. The engine first ran in 1933 and provided 660 horsepower (490 kW). Only a few engines were built as the aircraft designs intended to use it were not adopted by the Royal Air Force. The Goshawk was used to power the Short Knuckleduster, the Supermarine Type 224 (a predecessor to the Supermarine Spitfire) and other prototype aircraft. Design and developmentThe Goshawk was developed from the Kestrel IV prototype engine, to use evaporative (also known as "steam") cooling. Rather than keep the cooling liquid below its boiling point in the cooling system, the coolant was allowed to boil; the phase change from liquid to vapour takes more heat from the engine, so less coolant is needed. However, instead of a radiator to take the heat from the coolant, a condensor was required to turn the vapour back to liquid. This had to be much larger than a radiator and added drag to the aircraft design. Twenty engines were built and they flew only in prototypes as a few manufacturer's private ventures and "one offs". Powers for individual installations are quoted between 650 and {{convert|700|hp|abbr=on}}. Problems with coolant leaks, coolant pumping and the realisation that large wing mounted radiators would be vulnerable to combat damage caused the project to be cancelled although valuable lessons had been learned and were put to good use with development of the later Merlin.[1] Variants
(1932) Developed from the prototype Kestrel IV.
(1935) 600 hp. Lowered propeller reduction gear ratio.
(1935) 600hp. Further reduction of gear ratio.
660 hp. High ratio reduction gear.
660 hp. Raised reduction gear ratio.
660 hp. Special experimental engine. Maximum power output: 837 hp. ApplicationsThe Goshawk was the power unit specified for the twin engined Short Knuckleduster flying boat (K3574) to Specification R24/31 and "preferred" for submissions to Air Ministry specification F7/30 for a fighter aircraft. Goshawks were used by all three officially sponsored prototypes, the Supermarine Type 224 (K2890),the Westland F.7/30 (K2891) and the Blackburn F3 (K2892), which only taxied with the Goshawk fitted and did not fly, in addition to two private venture entrants, the Bristol Type 123 and the Hawker P.V.3. The Goshawk also powered Hawker's privately developed "High Speed Fury Mk 2" (K3586) and "Intermediate Fury" 2" (the latter Hawker's own development aircraft and "hack" serial G-ABSE)[2] and the Westland Pterodactyl V (K2770) and was installed for trials in the Gloster TSR.38 (S1705), and the first Gloster Gnatsnapper prototype (N227). Application list
Specifications (Goshawk I){{pistonspecs| |ref=Lumsden[3] |type=12-cylinder liquid-cooled 60 degree Vee aircraft piston engine |bore=5.0 in (127 mm) |stroke=5.5 in (140 mm) |displacement=1,295.88 in3 (21.25 L) |length=74.61 in (1,895 mm) |width=24.41 in (620 mm) |height=35.63 in (905 mm) |weight=975 lb (442 kg) |valvetrain= OHC - Overhead Camshaft |supercharger=Single-stage supercharger |turbocharger= |fuelsystem= |fueltype= 77 Octane petrol |oilsystem= |coolingsystem=Liquid-cooled |power= 600 bhp (447 kW) at 2,600 rpm |specpower=0.46 hp/in3 (21 kW/L) |compression=6:1 |fuelcon= |specfuelcon= |oilcon= |power/weight=0.61 hp/lb (1 kW/kg) }} See also{{aircontent|see also= |related=
|similar aircraft= |lists=
|similar engines=
}} References
1. ^Gunston 1989, p.141. 2. ^"Fighting Breed" Flight 1951 p692 3. ^Lumsden 2003, p.197.
Further reading
2 : Rolls-Royce aircraft piston engines|Aircraft piston engines 1930–1939 |
|||||||||||||
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。