In accordance with the instructions received in Air Ministry letter, reference 385627/35/R.D.A, dated 16.12.35 short performance and handling trials have been made, the results of which are given in the accompanying pages as follows:-
 
 Pages.
Climbing trials1, 9.
Speed trials1, 10.
Take-off and landing trials1, 10.
Airscrews6.
Handling trials18, 18a,b,c,d,e
Diving trials19.
Design and Construction39.
Power unit and Installation40, 40a,b.
Summary of flying qualities43.
 

TEST REPORT No.     M/689
Date.    April 1936

SUMMARY OF TRIALS

AEROPLANEHawker monoplaneNo.    K5083
 
SPEC. No.F.36/34
CONTRACT. 357483/34.
CONTRACTOR.Hawker Aircraft Ltd..

TYPELandplaneDUTY    High Speed Single Seater Fighter.
 
ENGINES.Merlin C No. 111144Normal B.H.P    1029 at Rated Altitude 11,000ft
 
At     2,600     R.P.M.     at rated boost pressure +6 lb/sq.in.

Tare weightLb.
Weight light
Fixed military load
Fuel (Firm’s figure) 107.5 gallons*
Oil (Firm’s figure) 7
Flying weight on trials.5672
* Based on 7.7 lb. per gallon.

At Full Throttle
Height FeetSpeed M.P.HTime to Climb MinsRate of Climb ft/min
   S.L253    0     2550
   2000261.50.752650
   5000274    1.892810
   10000295.53.632680
   15000314    5.702150
   20000311    8.401620
   25000301.512.08  1100
   30000282.518.10    570

Service ceiling (estimated) 34,500 ft.Landing speed (from camera) 59 M.P.H
Take off run 265 yds. Time. 11.5 secsDistance from rest to clear 50 ft. screen 430 yds.
Stalling speed (A.S.I.) 57 M.P.HGliding in A.S.I. 78 M.P.H.
Best landing A.S.I. 70 M.P.H Distance to rest (with brakes) flap open
After clearing 50 ft. screen 475 yds.

Landing and take off tests corrected to wind of 5 M.P.H
In View of the urgency of the trials and as the aircraft was received ballasted by the firm to represent from the weight and C.G. point of view the aircraft with eight gun wings and other service equipment, no attempt was made to weigh the aircraft light or determine the tank capacities. It should be noted that the ballast to represent the guns was carried in the fuselage.

CLIMBING TRIALS

Height in
Standard
Atmosphere
Feet		Time
From
Start
Min		Rate
of
Climb
Ft./Min. 		True
Air
Speed
M.P.H		A.S.I.
M.P.H.		Position
Error Correction
And
** Compressibility Correction		R.P.MBoost
Lb/sq.in.
Sea Level02550151.5150    +1.5           0   2100+6     
  1,0000.382600154   150    +1.5           0   2125+6     
  2,0000.762650156   150    +1.5           0   2125+6     
  3,0001.152710158.5150    +1.5           0   2180+6     
  5,0001.892810163.5150    +1.5           0   2235+6     
  6,5002.432880167   150    +1.5           0   2275+6     
10,0003.632680173.5148   +1.6       -0.5 2305+4.15
13,0004.8  2370177.5144   +1.9       -0.52305+2.25
15,0005.7  2150181   142   +2.0       -0.52305+1.1  
16,5006.4  2000183   140   +2.1       -0.52300+0.3  
18,0007.251840186.5139   +2.2       -0.52300-0.5  
20,0008.4  1620189.5136.5+2.3       -0.5 2295-1.5  
23,00010.4     1310195   133   +2.5       -0.52285-2.9  
26,00013.0       990199.5129.5+2.7       -1.02265-4.3  
28,00015.2       790204   127.5+2.9       -1.0 2245-
30,00018.1       570208   125   +3.0       -1.02210-
7,6002.762950170   150    +1.5           0   2300+6     

Estimated absolute ceiling. 35,400 ft.Greatest height reached. 30,000 ft
 
R.P.M. stationary on ground. 1,990Boost pressure lb./sq.in. +6
 
** Additional correction to allow for compressibility effect on A.S.I. reading.
* Full throttle height.
Note 1 :- For position error correction curve and position of pressure head see Figs. 13 and 13a.

SPEED TRIALS

Height in
Standard
Atmosphere
Feet		True
Air
Speed
M.P.H		A.S.I.
M.P.H. 		Position
Error Correction
And
** Compressibility Corrections		R.P.MBoost
Lb/sq.in.		Appoximate
True Air
Speed at
2750 R.P.M.
Sea Level253   258      -4.9           0   2505+6    
1,000257.5259      -5.0           0   2535+6    
2,000261.5259   -5.0       -0.22560+6    
3,000265.5259   -5.0       -0.32590+6    
5,000274   258.5-5.0       -0.62645+6    
6,500280.5258.5-5.0       -1.02685+6    
10,000295.5257.5-4.9       -1.72785+6    
13,000308   246   -4.2       -1.92870+6    
15,000314   243   -4.0       -2.22930+6    
16,500315   237.5-3.7       -2.42960+5.7273
18,000313.5231   -3.3       -2.52940+4.3 
20,000311   222   -2.7       -2.52910+2.7 
23,000306   207.5-1.9       -2.52860  +  .55 
26,000298.5192.5-1.0       -2.52795-1.4 
28,000291.5182   -0.4       -2.52745  -2.65 
30,000282.5170   +0.3       -2.42680  -3.90 
16,200*315   239   -3.7       -2.42960+6    

Landing and take-off tests corrected to wind of 5 m.p.h.
Take-off run (flaps shut) 265 yards.Time11.5 secs.
Distance from rest to clear 50 foot screen 430 yds.
Gliding in A.S.I 78 M.P.H.Stalling speed (flaps shut) 77 M.P.H. A.S.I.
Landing A.S.I. 70 M.P.H.Stalling speed (flaps open) 57 M.P.H.
Distance to rest (with brakes) after passing over 50 ft screen 475 yds.
Landing run with brakes 205 yds. Landing run without brakes 525 yds.
 
        Note: Landing runs quoted with flaps open.
 
        Take-off airspeed from camera measurements 81 m.p.h.
        Landing airspeed from camera measurements 59 m.p.h.
 
** Additional corrections to allow for air compressibility on A.S.I reading.
* Full throttle height.
Note 1 :- For position error correction curve and position of pressure head see figs 13 and 13a.
Note 2:- For take-off and landing flight paths see fig 17.
 
RATE of CLIMB ~ TIME to HEIGHT
LEVEL SPEEDS & RPM at HEIGHTS

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