Westland Wallace

The Westland Wallace was a British two-seat, general-purpose biplane of the Royal Air Force, developed by Westland as a follow-on to their successful Wapiti. As the last of the inter-war general purpose biplanes, it was used by a number of front line and Auxiliary Air Force Squadrons. Although the pace of aeronautical development caused its rapid replacement in front line service, its useful life was extended into the Second World War with many being converted into target tugs and wireless trainers. In 1933 a Westland Wallace became the first aircraft to fly over Mount Everest, as part of the Houston Mount Everest Expedition.

Design and development
In 1931, Westland produced the PV-6, a private-venture development of its successful Wapiti. This updated aircraft embodied a number of improvements including a lengthened fuselage, brakes and wheel spats on the undercarriage and a new engine. By this time both the appearance and performance differed considerably from the standard Wapiti, so the company designated it the "PV6 Wallace." Compared with the earlier Wapiti, the Wallace was 20 inches (0.5 m) longer, incorporated an improved undercarriage and was powered by a 655 hp (488 kW) Bristol Pegasus IV engine. The first batches of MK I Wallaces were conversions of Wapitis, a total of 68 powered by 570 bhp (425 kW) Pegasus IIM3 engines.

Westland designed an improved version, the Mk II which fitted with a more powerful engine and the then-novel idea of an enclosed canopy over both crew positions. This offered greater comfort for the crew and improved the rear gunner's aim by protecting him from the slipstream. Three Wallace Is (K4346-K4348) were later converted to Mk II standards, including fitting the closed canopy.

Operational history


The original PV-6 prototype, registered G-ACBR (and also known as the Houston-Wallace) along with Westland PV-3 G-ACAZ, was part of the Houston Everest Expedition, named after Lucy, Lady Houston the patron, an attempt to fly over Mount Everest. Both aircraft received modifications that included fitting heating and oxygen equipment, fully enclosing the rear cockpits and using highly supercharged Bristol Pegasus IS 3 engines. Flown by Flight Lieutenant D.F. McIntyre, the two aircraft became the first to fly over Mount Everest on 3 April 1933.

Most of the Wallaces served with the Auxiliary Air Force: 501, 502, 503 and 504 squadrons beginning with the converted Wapitis early in 1933. Others operated with the Anti-Aircraft Co-operation Flight at RAF Biggin Hill. The last Wallace was completed in October 1936.

When withdrawn from the general purpose role, many Wallaces were converted into target tugs. A total of 83 Wallaces remained in service at the beginning of the Second World War. The last were withdrawn in 1943.

Variants

 * Westland PV-6 - Prototype, later converted to military configuration as a Wallace I.
 * Wallace Mk I - Conversion from Wapiti powered by a 570 hp (425 kW) Bristol Pegasus IIM3 engine, 68 converted.
 * Wallace Mk II - New aircraft with glazed cockpit and powered by a 680 hp (506 kW) Bristol Pegasus IV engine, 104 built.

Operators

 * Royal Air Force
 * No. 501 Squadron RAF
 * No. 502 Squadron RAF
 * No. 503 Squadron RAF
 * No. 504 Squadron RAF
 * No. 504 Squadron RAF