FACTOID # 15: A mere 0.8% of West Virginians were born in a foreign country.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Bristol Perseus
Bristol Perseus engine

The Perseus was a nine cylinder one_row radial aircraft engine produced by the Bristol Engine Company starting in 1932. It was not widely used due to the rapid introduction of much more powerful two_row engines like the Bristol Hercules, but is notable as being Bristol's first successful sleeve valve design.


In late 1925 and early 1926, the RAE published a series of papers on the sleeve valve principle. In short, the sleeve valve replaced the normal poppet valves in the engine with a rotating sleeve inside the cylinder. The sleeve rotated, and holes in the sleeve and cylinder lined up to open and close the valve. The advantages were primarily simplicity and that less energy is needed to run the system. However at higher powers and RPMs, when the engine needs to move considerably more air more quickly, the sleeve design comes into its own. The sleeve is also much easier to "drive" than the poppet, there are no pushrods or rockers needed just a gear at the base of the cylinder, so it is a much better design to use in "dense" two-row engines where the pushrods otherwise take up considerable space. It was this "future expansion" capability that interested Roy Fedden when he first read of the work.


By 1927 Fedden had built a working two cylinder V as a testbed, with the idea of developing it into a V-12. However several problems cropped up on the design, notably that the sleeves tended to burst during the power stroke and strip their driving gears. This led to a long series of tests and materials changes and upgrades that required six years and an estimated 2 million pounds, but by 1933 the problems had been worked out.


The result was a Jupiter-sized engine adapted to the sleeve system, the Perseus, and its smaller cousin, the Bristol Aquila. The first production versions of the Perseus were rated at 580 horsepower 433 kW), the same as the same-year model Mercury, which shows that the sleeve system was being underutilized. However this was quickly uprated as improvements were introduced, and by 1936 the Perseus was delivering 810 hp (604 kW), eventually topping out at 930 hp (690 kW) in 1939.


The Perseus saw limited use in the civilian field, notably on the Short Empire flying-boats, but was more common in the now-expanding military field where it was found on the Westland Lysander, Vickers Vildebeest, Blackburn Botha, Skua and Roc bombers.


The main contribution of the Perseus is that its mechanicals were used as the basic piston and cylinder for the "twinned" versions, the tremendously successful Hercules and Centaurus. It was in these designs that the advantages of the sleeve valve were finally put to good use, and by war's end the Centarus was one of the most powerful engines in the world.


Specifications

Layout: nine-cylinder, one-row, radial
Bore by stroke: 5.75 by 6.5 in (146 by 165 mm)
Displacement: 1520 cu in (24.9 L)
Compression ratio: (unknown)
Power: 540 hp (400 kW) at 2400 rpm
Weight: 1026 lb (466 kg)

List of Aircraft | Aircraft Manufacturers | Aircraft Engines | Aircraft Engine Manufacturers


Airlines | Air Forces | Aircraft Weapons | Missiles | Timeline of aviation



  Results from FactBites:
 
Bristol Perseus (487 words)
The first production versions of the Perseus were rated at 580 horsepower, the same as the same-year model Mercury, which shows that the sleeve system was being underutilized.
The Perseus saw limited use in the civilian field, notably on the Short Empire flying-boats, but was more common in the now-expanding military field where it was found on the Westland Lysander, Vickers Vildebeest, Blackburn Botha, Skua and Roc bombers.
The main contribution of the Perseus is that its mechanicals were used as the basic piston and cylinder for the "twinned" versions, the tremendously successful Hercules and Centaurus.
Bristol Type 152 Beaufort (1025 words)
The Bristol Beaufort was one of a series of aircraft derived from the earlier Bristol Blenheim.
The first aircraft to be submitted to specification G.24/35 was the Bristol Type 149, which went on to be produced in Canada as the Bolingbroke and in Britain as the Blenheim Mk IV, for use as a light bomber.
Bristol’s response was to further modify the Type 150, producing the Type 152 Beaufort, which could satisfy both M.15/35 and G.24/35.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m