wrote:
I have the SSA's "Directory of Sailplanes" from sometime in the
1970s(?),

There is a much newer issue (1997) available on printed ($6) or CD ($10)
from the SSA.

which is a great resource for finding the basics of certain
models of sailplanes, but I'm looking for something more detailed on
glidepath control. For example, if I want to find out if the Slingsby
Kestrel uses flaps or spoilers, or I want to find out if the Phoebus C
uses flaps or spoilers, or...

Is there such a resource?

The 1997 directory has this information on it.


--
Eric Greenwell - Washington State, USA
* Change "netto" to "net" to email me directly
* "Transponders in Sailplanes" http://tinyurl.com/y739x4
* "A Guide to Self-launching Sailplane Operation" at www.motorglider.org