It was of wooden construction covered with fabric, and was in most respects a scaled-up development of the single-seat German Grunau Baby, which Slingsby had built under licence before the war.

The strut-braced wings had a span of 50 feet (15 m), and the upper decking section of the nose was removable, in order to expose the crew to the airflow in the same way as a primary glider.

Improvements were suggested, and the result was the T.21A, first flown in 1947, which had its wingspan increased to 54 feet (16 m), and dispensed with the removable nose section.

Large numbers were exported to India, as well as to Egypt, Jordan, Kenya, Malaya, the Netherlands, Pakistan, Portugal, South Africa and Sweden.

[1] Sri Lanka United Kingdom Data from British Gliders and Sailplanes 1922-1970[3] and The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde[4]General characteristics Performance