On Tuesday, October 8, 2019 at 3:28:04 AM UTC-4, Bruce Hoult wrote:
On Monday, October 7, 2019 at 5:07:25 AM UTC+13, Dan Marotta wrote:
I can roll up into a 90 degree bank and, if I don't apply up or down
elevator, the plane won't turn.Â* The nose will simply knife downward.Â*
So, am I clinging to something?Â* Think vectors and the vertical and
horizontal components of lift.

If you are flying straight and level and then roll into a 90 degree bank while keeping the same elevator position then you will enjoy turning with 1G of centripetal acceleration. Until the nose falls through. And then you'll enjoy a 1G pullout (more as the speed builds).

The only way you can *not* turn in that 90 degree bank is if you actually moved the stick forward to the position that would give you a zero-G pushover in level flight.

You haven't tried explaining this to a student, have you? :-)

Here's what really happens if you bank to 90 degrees while holding the elevator control in one place: the nose drops starts dropping the moment you begin to bank, the aircraft begins to accelerate and the g forces increase. There is -no- period of time that "you will enjoy turning at 1G of centripetal acceleration."

Langewiesche (Stick and Rudder) has it right. Think of the elevator control as your angle of attack control. Chapter one, "How a wing is flown". What a great place to start the explanation of the art of flying.

best,
Evan Ludeman