On Oct 27, 8:12*pm, Bob Gibbons wrote:

In the interests of not "reinventing the wheel", few likely recall
that the late Dick Johnson published his design for a vane-based stall
warning indicator in the June 1990 (page 25) issue of SOARING
magazine. Dick showed full constructional details of his design in
this article.

You were off by a month. The article can be found in the July issue
on the SSA Soaring magazine's G-R-E-A-T archive.

http://ssa.org/magazine/archive/View...onth=7&page=25