Tag Archives: Gloster Aircraft Co. Ltd.

12 September 1934

Gloster SS.37 G7, prototype Gloster Gladiator
The Gloster G.37, prototype of the Gloster Gladiator Mk.I (Gloster Aircraft Co., Ltd.)
Phillip E.G. Sayer (Flight)
Phillip E.G. Sayer (Flight)

12 September 1934: Hawker Aircraft Company test pilot Flying Officer Phillip Edward Gerald Sayer made the first flight of the Gloster G.37, a prototype fighter for the Royal Air Force, designed to reach a speed of 250 miles per hour (402 kilometers per hour) while armed with four machine guns. The flight took place at Gloster’s private airfield at Brockworth, Gloucestershire.

The Gladiator was a single-place, single-engine, single-bay biplane, with fixed landing gear. The airplane was primarily of metal construction, though the aft fuselage, wings and control surfaces were fabric covered.

The production Gladiator Mk.I was 27 feet, 5 inches (8.357 meters) long with a wingspan of 32 feet, 3 inches (9.830 meters) and overall height of 11 feet, 9 inches (3.581 meters). It had an empty weight of 3,217 pounds (1,459 kilograms) and gross weight of 4,594 pounds (2,084 kilograms).

Gloster SS.37 prototype, right profile
Gloster G.37 prototype, right profile

The G.37 was equipped with a left-hand tractor, air-cooled, supercharged, 1,519.083 cubic-inch-displacement (24.893 liters) Bristol Mercury IV-S2 nine cylinder radial engine. With a compression ratio of 5.3:1, the IV-S2 was rated at  505 horsepower at 2,250 r.p.m., and 540 h.p. at 2,600 r.p.m., both at 13,000 feet (3,962 meters). It developed a maximum 560 horsepower at 2,600 r.p.m. at 16,000 feet (4,877 meters). The engine had a take-off power rating of 530 horsepower at 2,250 r.p.m., at Sea Level (3-minute limit). The IV-S2 drove a two-bladed fixed-pitch propeller through a 0.655:1 gear reduction. This engine weighed 920 pounds (417 kilograms).

The G.37 was repowered with a Bristol Mercury VI-S engine, which had a 6:0:1 compression ratio and a 0.5:1 gear reduction ratio. This engine produced a maximum of 636 horsepower at 2,750 r.p.m. at 15,500 feet.

The prototype was armed with two synchronized, air-cooled Vickers .303-caliber machine guns, firing forward through the propeller arc, and two .303-caliber Lewis guns mounted under the bottom wing.

With the upgraded engine and armament, the G.37 reached 242 miles per hour (389 kilometers per hour).

The Gloster Gladiator Mk.I with an enclosed cockpit and a Bristol Mercury IX engine had a maximum speed of 257 miles per hour (414 kilometers) per hour) at 14,600 feet (4,450 meters).

The Gladiator Mk.I entered service with the Royal Air Force in February 1937. It was the last biplane fighter to do so, and was the first fighter with an enclosed cockpit. Beginning with No. 72 Squadron, eight fighter squadrons were equipped with the type, though by the beginning of World War II, these were being phased out by more modern airplanes like the Hawker Hurricane and Supermarine Spitfire.

A total of 737 Gloster Gladiators, Mk.I and Mk.II, were built. In addition to the Royal Air Force, there were operated by several other countries in Europe, the Mediterranean and the Middle East.

Prototype Gloster Gladiator in flight, now marked K5200.
Prototype Gloster Gladiator G.37 in flight, now marked K5200. A .303-caliber Lewis machine gun is visible under the right wing. (Royal Air Force)

Gerry Sayer was appointed Chief Test Pilot of Gloster Aircraft Co., Ltd., in November 1934, after Hawker took over the company. On 15 May 1941, Sayer made the first flight of the Gloster-Whittle E.28/39, a prototype jet fighter.

Chief Test Pilot Phillip Edward Gerald Sayer, Esq., was appointed an Officer of the Most Excellent Order of the British Empire (OBE) on the New Years Honours list, 30 December 1941. He was killed in flying accident 22 October 1942, probably the result of a mid-air collision.

This production Gloster Gladiator Mk.I, K6131, shows the sliding cockpit enclosure. (Royal Air Force)
This production Gloster Gladiator Mk.I, K6131, shows the cockpit enclosure. (This airplane, the second production Gladiator Mk.I, was damaged beyond repair when it ran out of fuel near RAF Church Fenton, 26 March 1938.)  (Royal Air Force)

© 2017, Bryan R. Swopes

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7 November 1945

The Gloster Meteor F Mk.IV, EE455, 1945. (Gloster Aircraft Co., Ltd.)

7 November 1945: Wing Commander Hugh Joseph Wilson, AFC and Two Bars, Royal Air Force, Commandant of the Empire Test Pilots’ School at RAF Cranfield, set the first world speed record with a jet-propelled airplane, and the first speed record by an airplane in excess of 600 miles per hour (965.606 kilometers per hour), when he flew the Gloster Meteor F Mk.IV, EE454, to 975.68 kilometers per hour (606.26 miles per hour)—0.80 Mach—at an altitude of 250 feet (76.2 meters). The course was an 8 mile (12.9 kilometers) straight away from the Herne Bay Pier to Reculver Point, along the south coast of the Thames Estuary. This was a new Fédération Aéronautique Internationale (FAI) record for speed over a 3 kilometer course.

FAI Record File Num #9847 [Direct Link]
Status: ratified – retired by changes of the sporting code
Region: World
Class: C (Powered Aeroplanes)
Sub-Class: C-1 (Landplanes)
Category: Not applicable
Group: 3 : turbo-jet
Type of record: Speed over a 3 km course
Performance: 975.68 km/h
Date: 1945-11-07
Course/Location: Manston, KT (UK)
Claimant H.J. Wilson (GBR)
Aeroplane: Gloster Mk IV “Meteor”
Engines: 2 Rolls Royce Derwent

Gloster Meteor Mk.III EE457, sistership of the two record-setting Mk.IV prototypes. (Unattributed)
Gloster Meteor F Mk.III EE457, sistership of the two record-setting Mk.IV prototypes. (Unattributed)

Months of preparation by both the Royal Air Force, which formed a special “flight,” and Gloster Aviation Co., Ltd., went into the speed record effort. Two Meteor F Mk.III fighters, EE454 and EE455, were modified on the production line to the new Mk.IV version to attempt the speed record. The standard B.37 Rolls-Royce Derwent Series I turbojet engines were replaced with Derwent Series V turbojets and lengthened jet nacelles. The wings were shortened, the tips reshaped and the canopy was cut down and strengthened. All trim tabs on flight control surfaces were disabled and their edges sealed. Landing gear and gear door up-latches were strengthened to prevent them from being sucked open at high speed. The airplanes were lightened and all armament deleted. The surfaces were smoothed and painted in a gloss finish. EE454 retained the standard camouflage pattern, while EE455 was painted in a distinctive yellow-gold color.

Many hours of flight testing were performed to ensure that the airplanes would be stable enough at high speeds while flying at the very low altitude required by the Fédération Aéronautique Internationale‘s rules. The slightest deviation from smooth flight would have disastrous results.

Group Captain Hugh J. Wilson CBE AFC with Gloster Chief Test Pilot Eric Stanley Greenwood OBE. (Photograph courtesy of Neil Corbett, Test & Research Pilots, Flight Test Engineers)
Wing Commander Hugh Joseph Wilson, AFC and Two Bars, with Gloster Chief Test Pilot Eric Stanley Greenwood. (Photograph courtesy of Neil Corbett, Test & Research Pilots, Flight Test Engineers)

EE454 was flown by Wing Commander Hugh Joseph Wilson, AFC and Two Bars (three awards), and EE455 by Gloster Chief Test Pilot Eric Stanley Greenwood OBE. Each airplane was required to make four passes over the course, with two in each direction. The airplanes were required to remain at or below 250 feet during the runs over the course, and during the turns at the end of each run, below 1,300 feet.

On the day of the speed runs, the weather was marginal. It was cold and overcast, and visibility varied from 7 to 12 miles along the course. The wind was 8–12 m.p.h. from the north west.

Wilson made four passes over the course. His speeds for each run were 604, 608, 602 and 611 miles per hour (972, 978, 969, and 983 kilometers per hour). Greenwood made his speed runs an hour later. His runs were 599, 608, 598 and 607 miles per hour (964, 978, 962 and 977 kilometers per hour).

Wilson’s average speed was the higher of the two. His official homologated record speed is 975.68 kilometers per hour (606.26 miles per hour).

Post-flight inspections revealed that the sheet metal of the Meteors’ engine intakes had significantly distorted by the intense pressure differentials experienced during the speed runs.

The B.37 Rolls-Royce Derwent Series V, interestingly, was not a direct developent of the preceding Derwent Series I–IV engines. Instead, it was a scaled-down version of the RB.41 Nene, which was in turn, a scaled-up and improved Derwent I. The Derwent V had a single-stage, two-sided, centrifugal-flow compressor and a single-stage axial-flow turbine. The compressor impeller and turbine rotor were mounted on a single shaft which was supported on each end by roller bearings, and in the center by a ball bearing. The Derwent V used nine combustion chambers, and burned aviation kerosene. Engine lubricating oil was added to the fuel at a 1:100 ratio, by volume. The Series V had a Normal Power rating of 3,000 pounds of thrust (13.345 kilonewtons) at 14,000 r.p.m., and a Take-off or Military Power rating of 3,500 pounds of thrust (15.569 kilonewtons) at 14,600 r.p.m. (There was no time limit for this power setting.) The engine produced a maximum 4,000 pounds of thrust (17.793 kilonewtons) at 15,000 r.p.m. at Sea Level. During the speed runs, thrust was restricted to 3,600 pounds (16.014 kilonewtons) on both Meteors. The Derwent V engine was 7 feet, 4.5 inches (2.248 meters) long, 3 feet, 7 inches (1.092 meters) in diameter and weighed 1,280 pounds (581 kilograms).

(Rolls-Royce named its piston aircraft engines after predatory birds, e.g., Kestrel, Merlin, but its turbine engines were named after rivers.)

Gloster Meteor Mk. IV EE455 on jack stands. (Unattributed)
Gloster Meteor F Mk. IV EE455 on jack stands. (Unattributed)

British Pathé news film of the speed runs can be seen at:

Group Captain Wilson was born at Westminster, London, England, 28 May 1908, the only son of Alfred Wilson and Jessie Wood Young Wilson. He was educated at the University School, Hastings, and the Merchant Taylors’ School, London.

Wilson received a short service commission as a Pilot Officer in the Royal Air Force, 13 September 1929 and was assigned to the No. 5 Flight Training School, at RAF Sealand, Flintshire, Wales. Pilot Officer Wilson was then assigned to 111 Squadron at Hornchurch, Essex, 1930–1932. He was promoted to Flying Officer, 13 March 1931. From 1932 to to 1934, “Willie” Wilson was assigned to the School of Naval Co-operation and Air Navigation at Lee-on-Solent, Hampshire.

On the completion of his five-year short service, Wilson was transferred to the Reserve Air Force Officers list. He qualified in flying boats and acted as a flight instructor for the RAF Reserve School. Wilson was promoted to Flight Lieutenant 1 April 1937, with seniority retroactive to 1 April 1936.

Flying Officer Wilson in the cockpit of a Blackburn Roc fighter.
Flying Officer Hugh Wilson in the cockpit of a prototype Blackburn Roc fighter, RAF Northolt, 22 May 1939.

While a reserve officer, Wilson was a test pilot for Blackburn Aircraft Ltd., and made the first flight of the Blackburn Roc. He then became a civil test pilot at the Royal Aircraft Establishment, Farnborough.

In 1939 Flight Lieutenant Wilson was recalled to active duty. He was assigned as Commanding Officer, Aerodynamic Flight, RAE Farnborough, and also flew with No. 74 Fighter Squadron at Biggin Hill. On 1 September 1940, Wilson was promoted to the rank of Squadron Leader. In 1941, Wilson was appointed chief test pilot at the Royal Aircraft Establishment and was responsible for testing all captured enemy aircraft. He was promoted to Wing Commander, 20 August 1945.

Squadron Leader Hugh J. Wilson, AFC and Bar, in teh cocpit of a captured Focke-Wulf Fw 190A3, Werke Number 313, in RAF markings as MP499. (Royal Air Force)
Squadron Leader Hugh J. Wilson, AFC and Bar, in the cockpit of a captured Focke-Wulf Fw 190A 3, W.Nr. 313, in RAF markings as MP499, August 1942. (Detail from Imperial War Museum photograph)
CBE medal with Military ribbon.
Commander of the Order of the British Empire Medal with Military Division Ribbon. (Wikipedia)

Wing Commander Hugh Joseph Wilson, AFC and Two Bars, Royal Air Force, was named Commander of the Most Excellent Order of the British Empire (CBE) in the King’s Birthday Honours List, 13 June 1946.

On 22 February 1947, Wing Commander Wilson married the former Thom Isobel Moira Sergeant (Mrs. Moira Garnham). They had one son. On 4 December 1959, he married Miss Patricia Frances Stanley Warren. They had two children.

Wing Commander Hugh J. Wilson retired from the Royal Air Force at his request 20 June 1948, with the rank of Group Captain. He died at Westminster, London 5 September 1990 at the age of 82 years.

Gloster Chief Test Pilot Eric Stanley “Terry” Greenwood (29 November 1908–February 1979) was the first pilot to exceed 600 miles per hour, while test flying the Meteors. He was appointed an Officer of the Most Excellent Order of the British Empire (OBE) in the King’s Birthday Honours List, 13 June 1946.

© 2016, Bryan R. Swopes

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