"Robert M. Gary" wrote in
oups.com:

On Jun 11, 12:51 pm, Mxsmanic wrote:
Jim Logajan writes:
Myth:

It is impossible to perform a barrel roll such that the pilot feels
exactly 1 gee of force perpendicular to the floor of the cockpit.

No maneuver that involves a change in altitude can maintain exactly 1
G along the net acceleration vector (including perpendicular to the
cockpit floor). This is not a myth, it's a fact.

The only roll you can perform that does not involve more than 1 G of
net acceleration is one that involves no change in altitude, such as
a roll precisely about the longitudinal axis. But no roll that
maintains the net acceleration vector perpendicular to the cockpit
floor is in this category.

A barrel roll is not about the longitudinal axis of the plane, that is
an aileron roll.


Nope, a roll about the longitudinal axis of the airplane is a slow roll.
actaully that's not entirely correct either since a perfect slow roll
follows a perfectly staight line, which means the axis of the aircraft
must change in realation to the line of flight throughout.
A slow roll is, hower, a one G roll. The 1 G should always point
earthward, though.


An aileron roll is actualy not dissimilar to a Barrel roll in flight
path.


Bertie