Avro 636


The Avro 636 was a single-engined biplane British fighter-trainer built by Avro in the mid-1930s. Four were built for the Irish Air Corps.

Development

The Avro 636 was designed in November 1934 by Roy Chadwick, Avro's chief designer as a one or two-seat fighter-trainer, and was planned to reproduce the flying characteristics of single-seat fighters. It had a similar structure to the Tutor, with a welded steel tube fuselage, and fabric covered metal wings and tail.
The aircraft was designed to be operated as a single or two seater, with the provision for fitting two forward firing.303 in Vickers machine guns. When fitted with two seats and powered by a Armstrong Siddeley Jaguar IV radial engine, it was known as the Avro 636, and was suitable for advanced training, while when powered by a Armstrong Siddeley Panther and with the rear cockpit faired over, it could be used as a dedicated fighter with the designation Avro 636A.

Operational history

Four Avro 636s were ordered by the Irish Air Corps in December 1934. These aircraft were powered by old Armstrong Siddeley Jaguar IVC engines, which had originally been purchased by the Irish in 1930 for use in Vickers Vespa army co-operation aircraft. Although the Jaguar IVC powered aircraft was planned to be designated as the Avro 667, they were always referred to as Avro 636s.
The four aircraft were delivered in August 1935, where they were operated by the 1st Fighter Squadron based at Casement Aerodrome, Baldonnel, County Dublin. Two 636s were written off in landing accidents, but the remaining two continued in use in the early years of The Emergency, being used to intercept aircraft that strayed into Irish airspace. The 636 was retired in 1941.

Variants

;Avro 636: Basic design, originally planned to be powered by 420 hp Armstrong Siddeley Jaguar IV engine.
;Avro 636A: Version powered by 680 hp Armstrong Siddeley Panther XI engine.
;Avro 667: Version powered by unsupercharged 460 hp Armstrong Siddeley Jaguar IVC. Four built for Irish Air Corps. Known as Avro 636 in service.

Operators