Operation Sigma Sigma

Sigma
Role Open class sailplane
National origin United Kingdom
Manufacturer Operation Sigma Ltd
Designer John Sellars
First flight 12 September 1971
Status still flying
Number built 2

The Sigma is an experimental glider developed in Britain from 1966 by a team led by Nicholas Goodhart. After disappointing performance during flight testing the Sigma was passed on to a Canadian group which carried out modifications, making the Sigma more competitive.

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