Hurricane L-1547

Aeroplane and Armament Experimental Establishment
Martlesham Heath

21 january 1939

Hurricane L.1547.
Trials with 2-pitch metal aircsrew

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.	10	2
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.

Position	Centre.
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.	-
A.M. serial Nos.- Blades No.1	-
A.M. serial Nos.- Blades No.2	-
A.M. serial Nos.- Blades 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.

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
10,000	296	266	-1.7	-10.0	2775	+6.25
13,000	305.5	262	-2.3	-9.9	2850	+6.25
15,000	312	260	-2.7	-9.9	2900	+6.25
16,500	317	258.5	-3.0	-9.8	2940	+6.25
18,000	319.6	254	-3.2	-9.8	2960	+5.8
20,000	318	245	-3.4	-9.6	2935	+4.0
23,000	312.5	229	-3.5	-9.5	2880	+2.0
26,000
17,500*	320	257	-3.2	-9.8	2965	+6.25
* Full Throttle Height

LEVEL SPEEDS & RPM at HEIGHTS