On Jan 18, 1:08*pm, bildan wrote:

suggests a 235 Pawnee generates 400 Lbs of thrust at towing speeds.

That pawnee, assuming gross wt of 1900# and an optimistic best L/D of
10 (in zero thrust condition) needs 190 lbf thrust just to maintain
level flight at best L/D. I think it's obvious that it produces much
more than twice this amount of thrust under full power....

-T8