Myth: 1 G barrel rolls are impossible.

wrote in message
oups.com...
1. If I enter a coordinated turn, I experience an increase in Gs.
2. If I enter a descent, I experience a decrease in Gs.

If I do these two things at the same time, it is possible to enter a
descending turn without any change in Gs.

Yes. Note, however, that you must _accelerate_ downward, and not merely
drift
downward at a constant rate.

Right. A major part of your argument in this thread has been that it
is impossible to change the direction in which the plane is travelling
without accelerating the plane. Your own analysis, based on my
questions, clearly shows that it is possible to change the direction
the plane is going in without deviating from the 1G being exerted.
Note that the I am not denying that the aircraft is accelerating in
this situation. But it is doing so without a change in force being
felt. So where your argument breaks down is in the assumption that if
changing the direction requires acceleration, then acceleration will
require a change in G force.

I am not saying that this is, in of itself, proof of the possibility
of the 1G barrel roll. It does, however, clearly indicate a flaw in
your argument. I find it odd that you find it so hard to believe that
people can believe that changes in direction are possible without
accelerations being felt, given that by your own admission, these
people are actually correct.


Of course, all combinations are indeed possible. But this interesting
special case of the situation exists, doesn't it, in which there is no
change in the force felt by the pilot?

Yes. It sounds a lot like a spin.

What? It sounds very little like a spin - try entering a spin with no
change in G force!


A change in direction does not *require* acceleration..........a change in
direction *is* acceleration.
You "feel" the effects of acceleration, whether it is caused by gravity, a
change in velocity, or
change in direction. All of these factors come into play when doing any
maneuver giving a net
result that you interpret as gee's, whether you are in freefall or in a high
gee turn.