[Les]

Originally Posted by Les

"is the C/W load dependant ?"

Yes

A drastically revised answer
I don't think C/W is load dependant.

Yes, I think you are correct "the greater Twi - Tai the lower the C/W" or at least I think C/W changes with Twi - Tai .
Yes, again, you are correct "the changes, again, are not so large in our small rads at low velocities " or the at least C/W changes with Twi - Tai vary with velocity.

Edit Thanks for helping crystallize my thoughts.
Upto now was wishing has thrown out "Delphi's problem child" with the bathwater