At 23:16 01 July 2011, ContestID67 wrote:
As promised you can find scans from "Joy of Soaring" (1969) of the
BJ-4 here = http://aviation.derosaweb.net/images/BJ-4/

If the wings of the BJ-3 were used on the BJ-4 (they sure don't look
the same in the two images) then the fowler flabs shown on the BJ-3
are removed on the BJ-4 image shown in the "Joy of Soaring" - which
would explain why I am seeing the 3"-4" somethings (hinges?) hanging
off the trailing edge.

The reason you don't see the flaps in the BJ-4 pictures is that both the
BJ-3/BJ-4 had variable geometry wings. The flaps retracted inside the
wing, thus increasing the aspect ratio for high speed flight.

I've obviously been in this sport too long, I remember too many obscure
things 8^(

Marc