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Date: Wed, 18 Nov 1998 17:06:37 -0600
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Hilton Goldstein wrote:

> Snowbird wrote:
> >Remember "no yaw no spin".
 
> I think you mean "no stall no spin". 

No, I meant exactly what I said.  A stall is a necessary, but
not sufficient, condition for a spin.  

"No yaw No spin" is not original with me, however; it's a quote
from Sammy Mason's excellent book "Stalls Spins and Safety",
from the chapter where he plays on the traditional "no stall no
spin" mantra to make the following points:

A plane which is stalled in a fully coordinated fashion is very
difficult to spin, even when stalled.  This is true even if the
bank is quite steep (45 degrees or more), *provided the turn is
coordinated*.

A plane which is not coordinated (esp. skidded) will spin much 
more readily from a stall, even if it's only in a shallow bank 
or if it's not banked at all.  The wing drop from a stall out of
a shallow turn where the ball is only 1/2-1 width out can be
sharp and dramatic (even so, the spin will be prevented if the
pilot "steps on the rising wing" quickly).

In addition, a plane stalled from an uncoordinated maneuver
may not provide the expected stall symptoms such as "buffeting".

Some of the most valuable flight instruction I received was
time in a Citabria and Decathlon, with parachutes, exploring
these issues first hand.  I recommend it for everyone.

I also recommend "Stalls Spins and Safety" by Sammy Mason, which 
I was able to borrow through Interlibrary Loan.  

Snowbird

