On Tuesday, July 2, 2013 10:55:40 AM UTC-6, BruceGreeff wrote:
Bill

With all due respect - how many winch launches do you have in a Ka8?

(Substitute all sorts of very light, early high wing wood and fabric.)
At .5g, and at 1g?

100's maybe 1000's At .5G I'll complain to the winch operator asking for more acceleration since it's unsafe. 1G is much safer.

Have watched the over rotation with full down elevator from over enthusiastic winch...

I haven't and I don't believe you have either because it doesn't happen. In fact CS-22 (JAR-22) Paragraph CS 22.152(4) expressly forbids forward pressure during winch launch for gliders.

However, people THINK it happens. Google the term "head-up illusion". It says in part, quote:

"Somatogravic illusions are caused by linear accelerations effecting the utricle and the saccule of the vestibular system. The head-up illusion involves a sudden forward linear acceleration during level flight where the pilot perceives the illusion that the nose of the aircraft is pitching up."

This explains 100% of the "uncommanded pitch-up under acceleration" stories..

You guys need to stop telling each other stories and do some basic reading on the subject.