Introduction.
 
               In accordance with instructions received in Air Ministry letter reference above, dated 25th October 1938, brief performance and handling trials have been made on the above aeroplane fitted with a 2 pitch metal airscrew and ejector exhausts during the period 7th to 23rd November 1938.

Contents of report.
 
  Page.Fig.
Weights.2
Airscrew particulars.6
Level speeds.102
Correction for position error and pressure head position.13,13a.
Take-off and landing.10a.14
Handling.18.
Extract from engine log book.
Photograph of airscrew and exhausts in situ.

Alterations to aeroplane.
 
               The following alterations were made consequent upon fitting the 2-pitch airscrew.
 
                    (a)   In order to reduce the forward movement of the centre of gravity, 50lbs of ballast was carried in the fuselage, distant 19 ft. 10 ins from the datum point. In addition there was 4lbs of lead in each horn of the elevator.
 
                    (b)   The setting of the fixed trimmers on the elevators was altered from 6 deg up to the neutral position, i.e. in line with the elevators.

Weight and Loading.
 
               Load in accordance with Weight Sheet Summary Serial No.629 Issue 1 A.P.1564 (A). (Volume III) Part III (A), 6th December 1937.
 
  lb.
Tare weight (including 50 lb of ballast in
  fuselage at 19 ft 10 ins aft of datum and
  4 lb. of lead in each elevator horn).
5,034.0      
Service Load.480.5  
Fuel. 77.5 galls @ 7.5lbs per gallon.581     
Oil. 7.5 galls @ 9.0lbs per gallon.67.5
Crew (Pilot and Parachute)       200.0        
Flying weight.   6,363.0   lb.
 
               The centre of gravity with the above load is 55.5 inches aft of datum measured parallel and normal to the datum line.

  AIRCRAFT.       Hurricane L.1547
 Engine.       Merlin II.

AIRSCREWS.

PositionCentre.   
Variable Pitch airscrew.Two Pitch   
Type.P-3-5-5-1.   
Serial No.D.H. 545959.   
Makers No."   
Diameter.11.03 ft.   
Direction of rotation.R.H.   
A.M. serial Nos.- Hub.-   
    "       "         "   Blades No.1-   
    "       "         "       "      No.2-   
    "       "         "       "      No.3-   
Basic pitch setting.Blade 1.
46°
Blade 2.
46°
Blade 3.
46°
Pitch range.20°20°20°
Coarse pitch setting.42°   -   30'42°   -   30'42°   -   23'
Fine pitch setting.28°   -     9'28°   -     9'28°   -   12'

SPEED TRIALS with a 2-pitch metal airscrew
Weight:- 6363 lb.

Height in
Standard
Atmosphere
Feet
True
Air
Speed
M.P.H.
A.S.I.
M.P.H.
Compressibility
and
Position
Error
Correction
R.P.M.Boost
lb./sq. in.
Remarks
Sea Level         Eight guns with flash eliminators fitted. Coolant flap in position for minimum drag.
  1,000          
  2,000          
  3,000          
  5,000          
  6,500          
10,000296   266   -1.7-10.0  2775+6.25
13,000305.5262   -2.3-9.92850+6.25
15,000312   260   -2.7 -9.92900+6.25
16,500317   258.5-3.0-9.82940+6.25
18,000319.6254   -3.2-9.82960+5.8  
20,000318   245   -3.4-9.62935+4.0  
23,000312.5229   -3.5-9.52880+2.0  
26,000          
  17,500*320   257   -3.2-9.82965+6.25
* Full Throttle Height
 
LEVEL SPEEDS & RPM at HEIGHTS

WWII Aircraft Performance