Not to hijack the thread but...

When I was researching 5 and 6 point harnesses about a decade ago, I ran across a lot of writing about the purpose of the various belts. The shoulder straps are actually NOT supposed to hold you down; they prevent your torso from rolling forward in a sudden de-celeration. The lap/thigh/crotch straps are really charged with keeping you anchored to the seat. The problem, especially with earlier generation seat pans, is the geometry of the anchor points isn't optimal. There were a couple of good technical papers on the topic; they're on an old desktop machine somewhere around here...

P3

On Saturday, September 7, 2013 11:44:06 AM UTC-4, Dan Marotta wrote:
snip I love my Speed Astir, but there is NO way to tighten the belts

enough to prevent cranial /canopy violent interference at maneuvering speed

ona bumpy daysnip



Had the same problem with my first LS-6a. The fix I came up with was to sew

velcro to the shoulder straps such that when you tightened them you could

connect the velcro. They'd stay tight.