Joe Rodriguez wrote: "I may be wrong, but I believe that a properly executed
barrel roll has a negative push at the top of the maneuver."

Joe, FWIW,

I don't do barrel rolls in my Lancair because I've never taken instruction
in aerobatics, however I was up yesterday with a friend (ex-Navy fighter
pilot) who seldom goes out to bore holes without doing a B-roll or two (he
flys a Falco). Right or left, the G's never go negative or even to zero. The
main thing I notice is about two G's positive at the initial pull-up to the
entry deck angle and maybe 1.5 at the recovery to level flight.

Dan Schaefer