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BRISTOL BEAUFIGHTER PERFORMANCE


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#1 CORSNING

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Posted 30 October 2013 - 01:26 PM

A.&A.E.E. Boscombe Down Beaufighter F.Mk.VI. X.7542.

 

Altitude.Speed/Climb

Meters..mph/fpm

S.L.......298/2120

.1,000..308/2130

.2,000..318/2120

.3.000..325/1750

.4,000..323/1710

.5,000..334/1380

.6,000..332/1015

.7,000..327/..660

Feet----------------

.5,000..313/2140

10,000.325/1735

15,000.329/1520

20,000.331/..980

25,000.322/..435

 

Speed

Full throttle height low s/c: 325 mph./3,018.8 m. (9,900 ft.)

Switch low/high s/c: 322.5 mph./4,024.4 m. (13,200 ft.)

FTH high s/c: 334 mph./5,000 m. (16,400 ft.)

Climb:

Critical altitude low s/c: 2,140 fpm./1,890.2 m. (6,200 ft.)

Swich low/high s/c: 1,710 fpm./3,109.8 m. (10,200 ft.

Critical altitude high s/c: 1,710 fpm./4,054.9 m. (13,300 ft.)

 

Engines: 2 x Bristol Hercules VI. Speed:+7psi.boost and Climb: +5psi.boost.

 

Ceilings

Combat: 19,820 ft.

Operational: 24,410 ft.

Service: 28,000 ft.

 

Test Weight: 19,750 lbs.

 

Wing Area: 503 sq.ft.

 

Wing Loading: 39.26+lbs./sq.ft.

 

Power Loading: 5.913+lbs./hp.

 

Following information is from William Green:

 

Engine: Bristol Hercules VI. 2 x 1,670 hp.

 

Armament: 4 x 20 mm./240 rpg. + 6 x 0.303in./1,000 rpg. + 1 x 0.303in. in dorsal position.


Edited by CORSNING, 25 October 2015 - 02:44 PM.


#2 CORSNING

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Posted 30 October 2013 - 02:05 PM

A.&A.E.E. Boscombe Down. Beaufighter F.Mk.VI X.7542.

 

Altitude.Speed/Climb

Meters..mph/fpm/minutes to altitude.

S.L.......299/2315/-----

.1,000..310/2320/-1.42

.2,000..321/2120/-2.83

.3,000..327/1855/-4.52

.4,000..325/1830/-6.37

.5,000..333/1380/-8.43

.6,000..330/1015/11.29

Feet--------------------------

.5,000..316/2285/-2.2

10,000.327/1855/-4.6

15,000.332/1530/-7.5

20,000.330/..980/11.6

 

Speed:

Full throttle height low s/c: 327.5 mph./2,591.5 m. (8,500 ft.)

Switch low/high s/c: 325.5 mph./4,024.4 m. (13,200 ft.)

FTH high s/c: 333.5 mph./4,756.1 m (15,600 ft.)

Climb:

Critical altitude low s/c: 2,325 fpm./1,402.4 m. (4,600 ft.)

Switch low/high s/c: 1,855 fpm./2,763.7 m. (9,065 ft.)

Critical altitude high s/c: 1,855 fpm./3,686 m. (12,100 ft.)

 

Engine: Same as above except, Speed: +9 psi.boost and Climb: +7 psi.boost.

 

It was determined in the trials that using more than +7 psi.boost was not profitable: " It would appear that the increase of power due to increasing engine r.p.m. is small and that the decrease in propeller efficiency at the higher r.p.m. produces a net decrease in thrust horse power in this case. It seems doubtful in view of these results, whether the increased R.P.M. limitations are worth while, in view of the probable decrease in engine life."


Edited by CORSNING, 24 August 2017 - 06:19 PM.


#3 CORSNING

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Posted 25 October 2015 - 02:44 PM

Beaufighter T.F.X. with Torpedo.

 

A. & A. E. E. Boscombe Down testing of Beaufighter T.F.X. No. E.L. 290 Report dated 14 April 1943. Test dates: January to March 1943.

The following performance figures are for this aicraft carrying a Mark XII 18 inch torpedo.

 

Altitude/Speed/Climb

Meters / mph / fpm

S.L.      297/1460

1,000   295/1390

2,000   301/1260

3,000   308/1230

4,000   305/  880

5,000   301/  525

6,000   NG./  175

 

Speed

Full throttle height low s/c: 297 mph./396.3 m. (1,300 ft.)

Switch low/high s/c: 294 mph./1,493.9 m. (4,900 ft.)

Full throttle height high s/c: 308 mph./2,804.9 m. (9,200 ft.)

Climb:

Critical altitude low s/c: 1,460 fpm./792.7 m. (2,600 ft.)

Switch low/high s/c: 1,260 fpm./1,372 m. (4,500 ft.)

Critical altitude high s/c: 1,260 fpm./2,926.8 m. (9,600 ft.)

 

Ceilings:

Combat: 12,000 ft. 

Service: 20,400 ft.

 

Test Weight: 24,000 lbs.

 

Engines: 2 x Hercules XVII

 

Note:....Comparing with previous tests of a Beaufighter VI with torpedo the all out level speed at 1500 feet has been

increased by 9 mph. by the use of the Hercules XVII engine.


Edited by CORSNING, 26 August 2017 - 06:55 PM.


#4 CORSNING

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Posted 07 February 2018 - 02:07 PM

Bristol Beaufighter Timeline 1938

 

1938: The ill feelings that were brought about at the signing of the Munich Agreement

     allowed the Bristol Aeroplane Company to recognize the RAF's need for a long-

     range fighter-bomber.

 

October 1938: Bristol design team lead by Leslie Frise commenced development of

     the Bristol Type 156 using the foresight of the Bristol Aeroplane Company for a

     high-performance long-range fighter capable of a more aggressive nature than

     foreseen by military officials.

 

November 1938: The Air Staff authorized Bristol to build four prototypes of their

     Type 156.

 

December 1938: L.G. Frise and his team began designing a fighter variant incorporating

     parts from the Beaufort's wing, tail assembly, undercarriage and a pair of Hercules

     engines carrying a battery of four 20 mm cannon. The main fuselage and the engine

     mountings were the only entirely new components.


Edited by CORSNING, 17 February 2018 - 12:06 PM.


#5 CORSNING

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Posted 07 February 2018 - 04:27 PM

Bristol Beaufighter Timeline 1939

 

March 1939: The long range fighter-bomber project was officially named Beaufighter.

 

17 July 1939: The first flight of the Beaufighter R 2052 prototype.

 

2 April 1940: R 2052 was delivered to the R.A.F. with two Hercules I-SM engines

     with 2-speed supercharging. Maximum speed was 335 mph./16,800 ft. but

     disappointing at higher altitudes.

 

30 April 1940: A second prototype (R 2053) with 1,300 hp. Hercules II engines had

     been delivered. Combat weight of the aircraft had risen from 16,000 lb. to

     18,531 lb. and performance was disappointing.

 

June 1940: The first flight of the Beaufighter IIF prototype with two Rolls-Royce

     Merlin XX engines.

 

27 July 1940: The first five production Beaufighter IFs were delivered to the R.A.F

     These had "bow & Arrow" aerials for the A.I. Mk.IV equipment. It is important

     It is important to point out that the first Beaufighters to enter service did not

     initially have radar but this was soon added by No. 32 M.U.

     Two Bristol Hercules XI engines: 1,400 hp. with a three blade Rotol constant-

     speed metal airscrew. 1,500 hp. when using the new 100 octane fuel.

     Max. speed: 321-323 mph./15,000-15,800 ft.

     Climb: 1,960 fpm./2,000 ft., 10,000 ft./5.8 min.,  20,000 ft./14.1 min.

     Service ceiling: 26,500 ft.

     Range: 1,170 ml./5,000 ft./182 mph., 1,550 ml. maximum.

 

2 September 1940: The first operational Beaufighters were sent to No.25 Squadron

     at North Weald, No.29 at Digby, No.219 at Catterick and No.604 at Middle

     Wallop, one aircraft each.

 

17/18 September 1940: S/Ldr. Widdows and P/O Watson of No.29 Sqdn. flew the

     first sortie in R2077 from 23:55 ro 01:05.

 

18 September 1940: Between 20:55 to 21:35 Widdows and Watson flew the first

     day mission.

 

27 September 1940: R2062 was destroyed in an enemy raid on Hucknall. It was

     one of three of the first production batch that was supplied to Rolls-Royce in

     1939 when the early Griffon engine was being considered for the prototypes

     of the Mk.II.

 

25 October 1940: The first air to air victory was by Sgt. Hodkinson & Sgt. Benn

      of 219 Squadron in Beaufighter R2097 shooting down a Do 17.

 

October & December 1940: R2058 and R2061 that were also delivered to Rolls-

     Royce were now delivered with Merlin X engines producing 1,075 hp./T.O.

 

19/20 November 1940: The 1st night time radar equipped Beaufighter air to air

     victory was by F/Lt. John Cunninham & Sgt. J. Phillipson of 604 Squadron in

     R2098 destroying a Ju 88.

 

January 1941: Testing of the G.C.I. Radar does not give a feed back from the

     earth and is very effective.

 

7 February 1941: The first flight of the Faire built Beaufighter I.

 

20 February 1941: The first flight of the Weston-built Beaufighter I.

 

22 March 1941: The first flight of the production Beaufighter II R2270 with a pair

     of 1,280 hp. Merlin XXs that had a reduction in drag ahead of the c.g. and the

     aircraft became unstable directionally. The introduction of 12 degrees of

     dihedral on the tailplane corrected the directional stability problem. 450 of this 

     type were built.

 

Late April 1941: The first Beaufighter II was delivered to 604 Squadron with a

     2-speed supercharger and 3 blade Roto constant-speed airscrews.

 

19/20 May 1941: Ina heavy "blitz" on London, 24 enemy aircraft were shot down

     by fighters and two by AA fire. The events of this attack virtually ended the

     Night Battle of Britain.

 

Note: " Early Beaufighters had fixed fittings, for both day and night duties; but

     as these rolls became increasingly divergent, two distinct airframes were

     standardized, distinguished by the suffex F for Fighter Command and C

     for Coastal Command appended to Mark number. All production Beaufighter

     IIs were designated IIF."

 

Note: The Fairey-Youngman bellows-type dive brake permitted rapid overtaking

     of a target without the risk of collision at the last moment.

 

May 1941: No.600 Squadron was the first to receive Mk.IIFs in quantity.

 

Summer 1941: Two Mk.V designated Beaufighters with Boulton-Paul Type A

     turrets with 4 x 0.303 in machine guns plus 2 x 20 mm forward firing cannon

     in the lower fuselage were tested. The increased flexibility of the turret did

     not make up for the reduced performance because of the added weight. The

     actual over all firepower was reduced.

 

September 1941: The Mark I Feed (Chatellerault recoil-operated feed) mechanism

     for the four 20 mm cannon was introduced in to the 401st Beaufighter.

 

Autumn 1941: No.2522 Squadron was formed in Coastal Command. The first 80

     Beaufighter ICs were produced at Filton for their use and for 272 Squadron.

     These were operated between the coasts of Norway and the Bay of Biscay.

 

January 1942: The Beaufighter VI began to supplant earlier models. The Mark

     N.F.VIF with AI Radar. These had the Hercules VI or XVI engines capable of

     1,615 hp./T.O. and 1,670 hp. for emergencies. This was the first mark to be

     fitted with the gas-operated 0.303 in Vickers machine-gun in the observer's

     station. A 50 gallon fuel tank was added in the starboard wing gun bay, a 24

     gallon tank in the port wing gun bay and a 29 gallon tank installed outboard

     of each engine nacelle. At 22,777 lb.:

     Maximum Speed: 315 mph./14,000'

     Initial Climb: 2,000 fpm.

     Service Ceiling: 26,000 ft.

     Range: 1,540 ml./190 mph.

 

March 1942: B. A. Company began designing a torpedo carrying Mark VIC.

 

April 1942: Bristol Aeroplane Co. received official permission to produce a

     trial installation using a 22.5 in American or 18 in. British torpedo.

 

20 April 1942: The first of 76 Mk.IC Beaufighters is delivered to the RAAF. The

     last of which arrives on 20 August 1945.

    

May 1942: Beaufighter VI I.T.F.(interim torpedo fighter) with the Hercules XVI

     are put into service. These were designated Mark VIC by Coastal Command.

 

4 April 1943: The first operational success of the torpedo carrying Beaufighter

     came when two enemy ships were sunk off the coast of Norway. These

     were sunk by a trial squadron that had been supplied sixteen converted

     Beaufighter VICs.

 

26 May 1944: The first Australian-built Beaufighter is constructed and flown,

     Beaufighter Mk.21 A8-1. Its Hercules XVIII engines have two-gear

     superchargers. 364 were built before roduction ceased in 1945. These

     had the standard 4 x 20 mm in the nose + 4 x 0.5 in Browning machine

     guns in the wings and the ability to carry 8 x 5 in. high velocity aircraft

     rockets, 2 x 250 lb. bombs, 2 x 500 lb. bombs and one Mk.13 torpedo.

 

Beaufighter TF Mk X: 2 x Hercules XVII engines with cropped superchargers

     improved low-altitude performance. This was the last major version of

     which 2,231 were produced. The later production models had a dorsal

     fin installed. The T.F.X. engines produced 1,725 hp./T.O./2,900 rpm.,

     1,735 hp./500 ft. and 1,375 hp./1,500 ft./2,400 rpm

     Combat Weight: 9,808 - 25,400 lb.

     Maximum Speed: 305 mph./S.L.,   320 mph./10,000 ft.

     Initial Climb Rate with torpedo:1,600 fpm.

     Service Ceiling without torpedo: 19,000 ft.

     Range with torpedo: 1,400 ml.

     Range with torpedo and long-range tanks: 1,750 ml. 

    

 

Beaufighter Mk.XIC:(T.F.X. without torpedo) had A.I. Mk.VIII radar in a thimble

     shaped nose, large dorsal fin and increased area of the elevator.

 

Beaufighter XX: R.N.Z.A.F. Beaufighters had Hercules XVII engines and were

     similar to the Mk.21 aircraft of Australia.


Edited by CORSNING, 17 February 2018 - 02:43 PM.


#6 Rick65

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Posted 08 February 2018 - 01:05 AM

The interesting thing about the development of the Beaufighter is that it was conceived as a Beaufort Fighter ie a fighter development based on the Beaufort which first flew in Oct 38. The fast development timeline and the overall performance of the aircraft is intrinsically tied to this successful "bitsa" development route.

 

As such it "combined the Beaufort's wings, undercarriage and tail unit with a new fuselage which would dispense with the earlier aircraft's internal weapons bay and replace it with the then very heavy armament of four 20mm Hispano cannons in the nose.

To achieve the desired high performance, more powerful engines than the Beaufort's 1,065hp Bristol Taurus `14 cylinder radials would be required, and the solution was found in another of the company's engines, the larger Hercules which although a two row 14 cylinder sleeve valve radial like the Taurus, offered a swift volume of 38.7 litres compared with the smaller engine's 25.4 litres."

Beaufort, Beaufighter and Mosquito in Australian Service by Stewart Wilson

 

Which is covered in Corsnings words when I read properly!!


Edited by Rick65, 08 February 2018 - 01:43 AM.


#7 CORSNING

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Posted 17 February 2018 - 02:54 PM

References:

Famous Fighters of the Second World War Vol.1 by William Green

The Bristol Beaufighter I & II Profile Publications No.137 by Philip J.R. Moyes

Bristol Beaufighter -Variant and Stats:

     http://www.historyof...r_variants.html






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