Operation Sigma 1966-1971
 

My father worked on this project from January 1967 until June 1969 as designer.Here are some original photos of the test section built in the summer of 1967 at Slingsby Sailplanes, Kirkbymoorside,N Yorkshire.
Harry Luck with the test specimen.
http://i854.photobucket.com/albums/a...specimen-1.jpg
Flap retracted.
http://i854.photobucket.com/albums/a...pretracted.jpg
Flap extended.
http://i854.photobucket.com/albums/a...ended-edit.jpg

roys,keep the info coming..... I would love to know more

bb

What exactly was Operation Sigma? Quick Google has little, ie nothing, to say.

Brian: It was a variable wing area sailplane, see here, http://en.wikipedia.org/wiki/Sigma_(sailplane)

Much obliged - thank you Henry.

Brian,

Also see the last few posts on the T53 thread.
http://www.pprune.org/aviation-histo...by-t53b-4.html

I love the carpenter's bench in the photos. You can tell Slingsby's was a wood and glue organisation.

Sigma
 

My general intention of this thread is to give factual and anecdotal info on Sigma hopefully without upsetting anyone.Here are some useful links on Flight Global Archive.
http://www.flightglobal.com/pdfarchi...a super-glider
http://www.flightglobal.com/pdfarchi...a super glider
Operation Sigma Ltd was formed in Feb 1966 by G E Burton,H C N Goodhart,F G Irving,B S Shenstone,W N Slater,C O Vernon,L Welch and
K G Wilkinson to manufacture a glider for the 1969 World Champs incorporating the principle of an area and camber changing wing.The flap gave an area extension of 35%.
Sigma is the Greek mathematical letter for " the sum of"
The final result was this.
http://i854.photobucket.com/albums/a..._Launch_32.jpg

Sigma photos
 

Well India Four Two what worries me is the ashtray in the photos, plus is that a cigarette lighter on the bench in the first photo?