Myth: 1 G barrel rolls are impossible.

You're right about a barrel roll, of course, I like that you can
rotate the wings through 360 degrees and maintain 1 G.

You could also, I think, start the 'roll' with an upward velocity
component of 320 feet a second and end it level, but hardly at the
same altitude (you'd be 1600 feet higher).

An even more interesting question would be, is there an airplane that
can fly this flight path? I think it would take massive control
surfaces to be able to pull a G with the yoke.


On Jun 14, 9:55 pm, Matt Whiting wrote:
wrote:
Jim, you don't have to do the physics for a 1 g roll. click on

stanford.edu/~sigman/one_g_roll.html for a really neat analysis.

Page down toward the end of sigman's article to see the actual flight
paths that it takes. It's a neat read.

Oh, for the nonbelievers in Newton and vector analysis and such (Mx
whatever comes to mind) don't bother.

A very nice analysis and it confirms that you can't execute a barrel
roll from straight and level flight while maintaining 1G. You either
lose a lot of altitude and end up in a steep dive or you have to pull up
(and thus exceed 1 G) if you want to end up at the starting altitude.
Case closed. :-)

Matt

wrote:
You're right about a barrel roll, of course, I like that you can
rotate the wings through 360 degrees and maintain 1 G.

You could also, I think, start the 'roll' with an upward velocity
component of 320 feet a second and end it level, but hardly at the
same altitude (you'd be 1600 feet higher).

An even more interesting question would be, is there an airplane that
can fly this flight path? I think it would take massive control
surfaces to be able to pull a G with the yoke.

I'm not an aerobatic pilot, but pulling 1G with the elevator isn't hard
on any airplane I've flown.

Matt

Matt Whiting wrote:
wrote:
You're right about a barrel roll, of course, I like that you can
rotate the wings through 360 degrees and maintain 1 G.

You could also, I think, start the 'roll' with an upward velocity
component of 320 feet a second and end it level, but hardly at the
same altitude (you'd be 1600 feet higher).

An even more interesting question would be, is there an airplane that
can fly this flight path? I think it would take massive control
surfaces to be able to pull a G with the yoke.

I'm not an aerobatic pilot, but pulling 1G with the elevator isn't hard
on any airplane I've flown.

Matt

Actually Matt, all you need to do with most g meters is to "tweak" the
stick with an instant of positive pitch pressure and release it. You
will register over 1 g just doing that :-))
Dudley Henriques

Dudley Henriques wrote:
Matt Whiting wrote:
wrote:
You're right about a barrel roll, of course, I like that you can
rotate the wings through 360 degrees and maintain 1 G.

You could also, I think, start the 'roll' with an upward velocity
component of 320 feet a second and end it level, but hardly at the
same altitude (you'd be 1600 feet higher).

An even more interesting question would be, is there an airplane that
can fly this flight path? I think it would take massive control
surfaces to be able to pull a G with the yoke.

I'm not an aerobatic pilot, but pulling 1G with the elevator isn't
hard on any airplane I've flown.

Matt

Actually Matt, all you need to do with most g meters is to "tweak" the
stick with an instant of positive pitch pressure and release it. You
will register over 1 g just doing that :-))
Dudley Henriques

Unfortunately, I've never had the pleasure of flying a g meter equipped
airplane!

Matt