In article ,
vincent p. norris wrote:

You don't have positive G all the way around in an aileron roll.

In a properly done aileron roll you certainly do...

Were you thinking of a slow roll?

I know the diffference between a slow roll and an aileron roll.

OK... but you contradict texts such as Szyurovy and Goulian, not to
mention basic experience.

If you think you maintain positive G in an aileron roll,

(1). Take along a bottle of water and a drinking glass next time you
fly.

(2). Fill the glass with water and place it atop the instrument
panel.

(3). Do an aileron roll.

And then what...? Does the water spill because the aileron roll is *not*
a positive-G maneuver, or because the forces on it are not balanced
laterally or longitudinally? (I can't do the experiement because there's
nowhere to put the glass in the plane I fly).

Or do it in a Cessna Aerobat -- which requires a positive G force to
keep the oil and fuel running. I can get the engine to stutter in a
second or two in a slow roll (more like a slowish roll in an Aerobat,
but never mind :-)); not in a properly-done aileron roll. That's
because, unlike a slow roll (where at the 180 degree point we typically
get mild negative G's), we keep positive G's on the plane at all points
in the aileron roll.

Much of the whole point of an aileron roll is to maintain a positive G
force on the plane. It's the easiest and most pleasant (for passengers)
of the four main rolls. To quote S & G (p50 in my edition): "On its
ballistic, corkscrew-like flight path, the airframe continuously
experiences normal acceleration, maintaining light, positive G all the
way around the aileron roll". Not that I take much notice of texts, but
there it is....

You weren't thinking of a "1G" maneuver were you, rather than "positive
G"?

Hamish