Avro Tutor

The Avro Type 621 Tutor was a two-seat British radial-engined biplane trainer of the interwar period, a simple and rugged design that served the Royal Air Force and many other air arms. Roy Chadwick designed it as an Avro private venture to replace the wooden Avro 504, with a steel-tube structure and doped linen covering. The prototype G-AAKT first flew in September 1929 in the hands of chief test pilot Sam Brown. The version with a 155 hp Armstrong Siddeley Mongoose was called the 621 Trainer and the more numerous Lynx-powered aircraft the Tutor, which also had a more rounded rudder. The RAF ordered 381 Tutors and 15 Sea Tutor floatplanes in all, 30 went to the Greek Air Force, and Poland built a licence version, the PWS-18, with 40 produced.