Myth: 1 G barrel rolls are impossible.

Dudley Henriques wrote in
news:2007061122074775249-dhenriques@rcncom:

On 2007-06-11 21:42:18 -0400, Bertie the Bunyip
said:

"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

Actually Bertie, think about it for just a moment. In a slow roll, you
do indeed roll the airplane on it's longitudinal axis but the roll
line isn't exactly straight.


Not for competition. You're judged by the line you fly. Mind you, if you
can make it look like you're not pushing the nose all over the place,
all the better.


Bertie