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SUPERMARINE SPITFIRE Mk.V PERFORMANCE


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#1 CORSNING

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Posted 15 October 2013 - 06:57 PM

SUPERMARINE SPITFIRE Mk.V Speeds at +9, +12 & +16 lbs. boosting.

 

I have completed the calculations on over six different complete reports. The down side is that the first four are with the Merlin 45 at boost levels of +8.8 to 9.3 lbs./sq.in. As far as I can tell, when the Spitfire five was introduced it was cleared for +12 lbs./sq.in. for at least 3 minutes of combat. If the interest is there I could post the data from these reports, but it would not be representative of the full capabilities of the Spitfire Mk.V.

 

With that being said I'll start with the data from the R.A.E. graph covering the speeds of the Spitfire Mk.V at +9, +12 and +16 lbs.

 

Altitude.Speed (mph)

Meters.+9 lbs.+12 lbs.+16 lbs.

S.L.......289....302....317

.1,000..302....318....331

.2,000..316....330....346

.3,000..330....344....360

.4,000..343....357....375

.5,000..357....372....378

.6,000..370....376....376

.7,000..370....370....370

.8,000..360....360....360

.9,000..346....346....346

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

.5,000..310....323....339

10,000.330....344....361

15,000.351....365....378

20,000.372....376....376

25.000.364....364....364

30,000.343....343....343

 

FTH: 374.5 mph./6,326.2 m../+9 lbs.    378 mph./5487.8 m../+12 lbs.    378 mph./4,085.4 m../+16 lbs.

250px-Spitfire_mark5b_ab910_of_the_bbmf_

wikipedia


Edited by CORSNING, 22 July 2017 - 03:04 PM.


#2 CORSNING

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Posted 15 October 2013 - 08:06 PM

Spitfire MK.Vc:  +16 lbs. boosting 25 November 1942

 

Report from Boscombe Down by the A.&.A.E.E. on the Spitfire Mk.Vc No. A.A.878 dated 11/25/42. Some figures have been calculated from figures given in the report.

 

Altitude.Speed/Climb

Meters..mph/fpm/minutes to altitude.

S.L.......317/3700/-----

.1,000..330/3700/--.9

.2,000..343/3700/-1.79

.3,000..356/3590/-2.66

.4,000..369/3190/-3.67

.5,000..365/2748/-5.5

.6,000..359/2330/-6.02

.7,000..354/1895/-7.61

.8,000..349/1488/-9.6

.9,000..341/1090/12.1

10,000.336/.-670/16.1

11,000.329/.-250/23.63

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

.5,000..337/3700/-1.38

10,000.357/3570/-2.7

15,000.367/3125/-5.24

20,000.359/2290/-6.15

25,000.351/1688/-8.75

30,000.341/1030/12.5

35,000.331/.-275/20.55

 

Speed FTH: 369 mph./3,963.4 m.

Climb Critical Altitude: 3,710 fpm./2,682.9 m.

 

Ceilings

Combat: 30,250 ft.

Operational: 33,845 ft.

Service: 36,500 ft.

 

Engine: Rolls-Royce Merlin 45. 1,185 [email protected] take-off / 3,000 rpm./ 54.3"Hg.(+12 lbs./sq.in.) boost. and 1,515 hp./@ 11,000 ft. / 3,000 rpm./ +16 lbs./sq.in. boost.

 

Armament: At the time of the trials:  2 x 20mm/120 rpg. + 4 x 0.303in/350 rpg. (Spitfire Mk.Vb standard armament in universal wing).

 

Combat Weight: 6,965 lbs.

 

Wing Loading: 28.77-lbs./sq.ft.

 

Power Loading: 4.597+lbs./hp.

 

Range: 475 ml.

 

Information made possible from graphs supplied by Mr. Neil Stirling and Mr. Mike Williams

http://www.spitfirep...e-V-raecart.jpg


Edited by CORSNING, 23 July 2017 - 06:06 PM.


#3 CORSNING

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Posted 15 October 2013 - 09:12 PM

Spitfire Mk.Vb: Merlin 50, +18 lbs. boosting 25 May 1943

 

A.&A.E.E. / Boscombe Down / Spitfire F. Mk. Vb W.3228 / Dated 5/25/43......."...has been fitted with a special Merlin 50 engine, on which the supercharger impellor was "cropped" to a diameter of 9.5"." The Maximum boost used in the trials was +18.2 lbs./sq.in.

 

Altitude.Speed/Climb

Meters..mph/fpm/minutes to altitude.

S.L.......325/4720/-----

.1,000..339/4720/--.68

.2,000..351/4316/-1.43

.3,000..347/3824/-2.2

.4,000..344/3332/-3.1

.5,000..341/2850/-4.15

.6,000..337/2366/-5.45

.7,000..330/1891/-7.0

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

.5,000..346/4545/-1.07

10,000.347/3800/-2.25

15,000.342/3055/-3.7

20,000.336/2320/-5.6

 

Speed FTH: 350.5 mph./1,798.8 m.

Climb Critical Altitude: 4,720 fpm./1,173.8 m.

 

Engine: Rolls-Royce Merlin 50M. 1,230 [email protected] take-off and 1,585 [email protected] 2,750 ft./3,000 rpm./+18 lbs./sq.in. boost.

 

Ceilings

Combat: 29,140 ft.

Operational: 32,770 ft.

Service: 35,700 ft.

 

Combat Weights: 6,130 lbs. in the speed trials and 6,450 lbs. in the climb trials.

 

Wing Loading: 25.32 / 26.64+lbs./sq.ft.

 

Power Loading: 3.8675 / 4.069+lbs./hp.

 

Armament: 2 x 20mm/120 rpg. + 4 x 0.303in./350 rpg.

 

Information above made possible by the graphs supplied by Mr. Mike Williams

and Mr. Neil Stirling.

http://www.spitfirep....com/w3228.html


Edited by CORSNING, 23 July 2017 - 06:04 PM.


#4 CORSNING

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Posted 28 October 2014 - 09:05 PM

From Mike William's excellent site: http://www.wwiiaircr...ire_21_roll.jpg
 
The first set of roll rate figures is for the Mk.V with fabric covered ailerons. The second set is for metal covered.
 
Speed:..150..175..200..225..250..275..300..325..350..375..400 (m.p.h.)
 
Fabric:....86....87....75....65....56....48....40....33....27....20         (deg./sec.) Maximum: 92 deg.sec./158 mph.
 
Metal:.....86....95..104....99....92....85....77....68....60....50....40 (deg./sec.) Maximum: 104 deg.sec./200 mph.


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#5 CORSNING

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Posted 09 January 2016 - 03:04 PM

Flying to the Limit by Peter Caygill

    

AFDU trials in late 1942 of the Spitfire Mk.Vb clipped wings.

     Rate of roll was improve considerably up to 25,000 ft.

     Response to aileron movements was much quicker.

     Wing span was reduced from 36' 10" to 32' 6".

 

Note: The standard wing Spitfire was put on the tail of a clipped wing Spitfire. In several cases the clipped wing Spitfire was able to evade so rapidly that it could reverse their positions in about 20 seconds.


Edited by CORSNING, 09 January 2016 - 04:34 PM.

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#6 Mercman

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Posted 10 September 2016 - 08:16 AM

Here is a 1941 AFDU Tactical Trial that compares combat performance of the RAF's then current Spitfire VB with the new Typhoon I.

 

http://www.wwiiaircr...ical_Trials.pdf


Edited by Mercman, 10 September 2016 - 08:19 AM.

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#7 CORSNING

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Posted 22 July 2017 - 04:57 PM

Spitfire Mk.Va: Merlin 45, +9 lbs. boosting 29 April 1941

 

Spitfire Mk.Va aircraft No. X.4922

Aeroplane and Armament Experimental Establishment

Boscombe Down

The following information is for a very early Mk.V. The climbs rates include

an oil cooling climb which began at 26,000 ft. up. No reason given why not

started sooner. Cooling the oil added over 450 fpm. to the climb rate.

 

Altitude / Speed / Climb

Meters / mph / fpm / minutes to altitude.

S.L.       301 / 2705

  1,000  313 / 2805 /   1.30

  2,000  325 / 2905 /   2.42

  3,000  336 / 3000 /   3.55

  4,000  348 / 3100 /   4.64

  5,000  360 / 2830 /   5.67

  6,000  372 / 2330 /   6.96

  7,000  370 / 1825 /   8.68

  8,000  360 / 1775 / 11.70 

  9,000  NG. / 1340 / 12.55

10,000  NG. /   895 / 15.43

11,000  NG. /   455 / 20.43

 

Engine: Rolls Royce Merlin 45 @ 3,000 rpm & +9 lbs. boost: 1,170 hp./T.O.,   1,210 hp./19,250 ft.

 

Full Throttle Height Speed: 375 mph. / 20,800 ft.

Critical Altitude Climb: 3,140 fpm. / 14,400 ft.

 

Ceilings:

Combat:        32,030 ft.

Operational:  35,770 ft.

Service:         37,700 ft.

 

Armament: 8 x 0.303 in. Browning machine guns/350 rpg.

 

Wing Area: 242 sq. ft.

 

Wing Loading: 26.65 lb./sq. ft.

 

Power Loading: 5.331 lb./hp./19,250 ft.

 

Test Weight: 6,450 lb.

 

Range: 475 - 500 ml.

 

Note: Normal Gross weight of the Mk.Va according to the NACA was 6,237 lb.

     Spitfire No. K.9788 at 6,170 lb. had a maximum climb rate of 3,460 fpm. 

 

The above information comes from http://www.spitfirep....com/x4922.html

which has been supplied to all of us by Mr. Mike Williams and Mr. Neil Stirling.

 

Added information comes from the works of William Green.

 

More to come, Jeff :)


Edited by CORSNING, 23 July 2017 - 06:09 PM.


#8 CORSNING

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Posted 23 July 2017 - 06:39 PM

SPITFIRE VB

Clipped-Wing (32' 6" span) versus Standard Version (36' 10" span)

 

Air Fighting Development Unit at Duxford

 

The following information comes from flight trial held late in 1942.

 

Method of test

Two Spitfire VB aircraft were selected with a performance which was

almost identical, the loading and equipment carried were standard

in each, and the propeller, engine and finish of each aircraft were

similar. A test flight was made under maximum cruising conditions

and no differences could be determined. The Wing tips were then

removed from one aircraft and trials were carried out , each trial being

performed twice to enable the pilots to be changed. The wing tips

were then replaced on one aircraft and removed on the other and

similar tests carried out. Differences in speed were taken as relative

increases or decreases owing to possible instrument inaccuracies,

and position error differences with and without tips. Readings for

level speeds were taken at 10,000, 15,000, 20,000 and 25,000 ft;

zoom climbs were made 10,000-15,000 ft. and 20,000-25,000 ft;

dives were made with similar engine settings.

 

Results of Comparative Tests

 

Level Speed

10,000 ft. In each case the clipped wing Spitfire proved the faster by

a small margin about 5 mph.

15,000 and 20,000 ft. The average results at these two heights showed

that the difference in speed is not measurable.

25,000 ft. The standard (wing) Spitfire is very slightly faster than the clipped

wing Spitfire.

     In all level speed runs the clipped wing Spitfire accelerated faster than

the standard wing Spitfire.

 

Climb

The average difference in time during zoom climbs from 20,000 to

25,000 ft. was 15 seconds in favor of the standard wing Spitfire.

From 10,000 ft. to 15,000 ft. no differences were indicated.

 

Dive

In all diving tests the clipped wing Spitfire drew away from the standard

Spitfire.

 

Maneuverability

At all heights to 25,000 ft. the rate of roll is considered improved by the

removal of the wing tips. The response to aileron movements is very

quick and very crisp. Four dog-fights were carried out, starting with

the standard Spitfire on the tail of the clipped wing Spitfire. On two

occasions the clipped wing Spitfire evaded so rapidly in the rolling

plane that it was able to lose the standard Spitfire and reverse the

positions in about 20 seconds. On the third occasion the clipped

wing Spitfire was also able to lose the standard Spitfire. The fourth

occasion was at 25,000 ft. and the standard Spitfire was able to keep

the clipped wing Spitfire in sight.

     The minimum turning circle of the clipped wing Spitfire at 20,000 ft.

has been increased by 55 ft. at 1,025 ft. compared with the Fw 190

turning circle of 1,450 ft. (RAE Farnborough figures). This slight

increase does not therefore detract from the fighting qualities of

the aeroplane in any way, since the clipped wing version is unlikely

to be in combat with the standard Spitfire.

 

Take-off

No difference was detected.

 

Landing

No difference detected.

 

General

The view downwards over the wing tips is improved considerably.

The strengthening of the wing by removal of the wing tips may permit

higher maximum IAS to be used.


Edited by CORSNING, 24 July 2017 - 07:21 PM.


#9 CORSNING

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Posted 24 July 2017 - 07:35 PM

Conclusion from the above post:

 

Speed

The clipped wing Spitfire is Increased at low altitudes which diminishes to

about even from 15,000 ft. to about 20,000 ft. The standard wing Spitfire

slowly takes over from there and has a slight edge at 25,000 ft.

 

Climb

Very little measurable difference up to about 20,000 ft. The standard wing

Spitfire is faster in a zoom climb from 20,000 to 25,000 ft. by about 15 sec.

 

Rate of Roll

The clipped wing version is superior at all altitudes.

 

Acceleration

The clipped wing version is superior at all altitudes.

 

Dive

The clipped wing version is superior at all altitudes.

 

Turning circle

The clipped wing version has a slightly larger turning circle.






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