Thanks Bob. It should be well organized: I spent the last 20 years as a technical author (and before that as a programmer) so I have no excuse for making a mess of it.
KaiMartin:
I also like the colors of the Sun IV. They are completely made up though. Bettina Gray's photo is black and white. (At least it was printed in the magazine in black and white.) The acrylic paints (a beginner set I bought) are really good.
I think your supposition about the Eagle III is correct. Like the rigids of the time, it was too complicated. (Just my opinion given that I never even saw the real thing.) In addition, although the harness and control frame made it look 'familiar' to Rogallo pilots, it seems to me it was totally dependent on the 'warperons' and rudder for turn control: The elevator control wires seem to be close under the pilot's right arm.
All I can do is speculate, but painting the picture caused me to study the thing in detail. I put some of my thoughts on it in
Painting the Eagle III on my personal interests web site, and some -- those with a firmer footing -- I included in
Scientific American hang glider on Hang Gliding History. There is some duplication, but I hope not too much.
Some of my speculation about its controlability in pitch is based on my experience of one of my own experimental hang gliders, which, like the Eagle III, had a 'free floating' camber. (It is speculation nonetheless.)
It would be great to have some direct info from Mike Markowski and Tom Peghiny of course. However, I have not discovered a way of contacting Mike. (Tom I know is aware of the painting.)