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Southdown Sailwings Sigma
The 1979 Southdown Sailwings Sigma had to be flown all the time, and if you did not get the push out right in turns, then don't bother with light ridge lift. The nose would drop on landing.
In 1979 Southdown Sailwings made the first 12 Sigma 12m. Alan Garard and Rod Stuart from NZ test flew all 12 gliders and loved them. Stuart’s Sigma hangs in the transport museum in Wanaka, New Zealand.
The Sigma was followed by the 1981 Sigma Floater.
Sigma Floater

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