spins from coordinated flight

Bertie the Bunyip wrote:
Dudley Henriques wrote in
:=
This is normal and many instructors (including myself BTW) use the
climbing turn power on stall as an intro to spin entry as a
demonstration (after careful verbal preparation with the student).

What screws everybody up when dealing with whether the airplane will
spin out of this cfg are the variables that are taking place as the
airspeed dissipates just before the stall break.

I personally don't like relying on the ball as the prime reference for
yaw cancellation when entering this regime just before the stall.
Between the slipstream forces and engine torque, the ball can be used
as
a general indicator for correction but is seldom dead on as an
indicator
that all yaw has been canceled out. The rub is that ther's a chance of
discrepency between a centered ball and a true canceling of all yaw
from
the vertical axis of the airplane.

Yeah, OK, I'd go along wiht this.

Like most aerobatic instructors, I like visual cues in these
situations
and teach them constantly even to primary students. The wingtip is a
great visual cue as you approach stall. If you stabilize the low
wingtip
tip visually against the ground then watch the left tip carefully,
when
the yaw has been compensated for by the correct amount of opposing
rudder, that low tip will remain stable. If more rudder is needed, the
tip will appear to move back on you. Stabilize that low wingtip and
the
stall break will be center nose down with little wing drop and little
tendency to spin (no yaw...no spin).
It's yaw if present, coupled with the other variables present in an
uncoordinated cfg as the stall breaks that can cause that severe wing
drop. This coupled with SUSTAINED UNCORRECTED YAW is what will produce
a
pro spin scenario.
What confuses people the most about the stall break explanation as
relates to wing drop is that even with yaw compensated for, there is
still an AOA difference between the wings and possible interference
with
the high wing at the stall break. This is what causes that over the
top
scenario so familiar to everyone.
There is as well the possibility of a low wing breaking stall under
certain conditions of control misuse as the stall is breaking, but
over
the top is usually what happens.



Yeah, OK. jibes with my experince ( I think, been a while).
NEver thought of looking at the tip during it. I'll try it and let you
know how I get on!

Bertie

Works like a charm in the vertical plane as well...loops....Cubans...etc.

--
Dudley Henriques