Thread: Canyon Turns
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Old March 11th 04, 04:29 PM
David
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On Thu, 11 Mar 2004 14:47:43 GMT, Robert Moore
wrote:

"Marc Lattoni" wrote

Today we did canyon turns, not at 30, not at 45 but more than 45
degrees. Sort of standing the airplane on its wingtip as we turn.


Yep! We fought this battle for about two weeks last year.
There were two groups, one was the slow down and use flaps
with a shallow angle of bank and the other group (me) quoting
the aerodynamic textbook solution of flying at maneuver speed
and using about 75 degrees angle-of-bank.

Quoting from "Aerodynamics For Naval Aviators":

"The aerodynamic limit of turn radius requires that increased
velocity be utilized to produce increasing load factors and
greater angles of bank"

"The maneuver speed is the minimum speed necessary to develop
aerodynamically the limit load factor and it produces the
minimum turn radius within aerodynamic and structural limits."

Bob Moore


I have been taught two ways of making Canyon Turns.
In New Zealand I was shown a maximum performance turn. First make a
note of horizontal references then roll over 60deg, applying full
power and pull hard on elevator with both hands. The stall warning
goes off all time. It works well but I could not pull hard enough to
get stall warning to operate (C172).

The alternative way was shown to me in the USA.
Apparently called a Texas Turn, this involved reducing throttle to
idle then pitch up until in 'White Arc'. Immediately apply full flap
then full power then full rudder. Some pull on elevator but
controlling airspeed.

The former causes lots of 'G' whilst the latter has almost no 'G' and
you turn in about one wingspan, very impressive.

It has been suggested that the latter could induce a spin. I've not
had anybody confirm but it appears to be something like a 'Wingover'
maneuver but I'm not into aerobatics! Any comments?



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