Bill,
Glad to see you here
.
You're on to something
Terry would drop and do pushups to prove his upper body strength.
That childhood illness effected his lower body, more so.
IMO, his upper-lower body mass was not proportionally normal/average.
His good leg was smaller than my arm. RIP Buddy
When I saw him towing/flying a 170Falcon, in Kingsville, with Donnell Hewitt, there were some PIO.
At that time I/we attributed it to light wing loading. Now that I look back?
During our more recent scooter ops, PIO never occurred on his new glider, the 135sq Sport 2.
I didn't see PIO 6-16, but the threshold/trigger between being a bit off line with the tow, and a progressive irreversible lockout, was dramatic.
Bill Floyd has commented how there are some differences in control, being a double amputee.
It might have been a contributing factor.
Thanks for helping to understand.