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Grenzschicht ("Boundary Layer")

a film by Charlie Jöst

$40 US + S&H
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Note: if you're in Europe, you may find it quicker to order directly from the producer; see http://www.akaflieg.uni-karlsruhe.de/idaflieg/video.html

Filmed in Aalen, Germany at the 1994 "Summer Meet", an annual flight test encampment held by idaflieg (umbrella organization for the German Akafliegs).

This professionally-produced film documents:

• Performance measurement via comparison flight testing against a calibrated aircraft, the "holy" DG-300/17
• Flying qualities evaluation using the "Zacher Protocol"
• Spin testing of the D-41 (a side-by-side two-seater from the Akaflieg Darmstadt)
• Wing flutter (SB-9); empennage flutter (D-41 and AK-5).
• Previously unpublished historical footage of sailplanes including early sailplanes at the Rhön in the 1920's, the Horton 15a, and the SB 6.

This film will be of interest to all soaring enthusiasts.

Also available: Fundamentals of Sailplane Design, a book by Fred Thomas.