Spin recovery vs tail design

On Mon, 11 May 2009 09:53:56 -0700 (PDT), bildan
wrote:


This led to the NACA standard spin recovery technique which called for
anti-spin rudder while holding full up elevator until the auto-
rotation slowed and only then applying down elevator. The reasoning
was that full up elevator exposed more of the rudder to high energy
flow.

Trying this method in nearly any glider is a very safe way to get
killed.

I am pretty sure that most glasss gliders of the least 40 years will
not recover from a spin if the elevator is held fully up during the
recovery attempt - they simply are not going to stop rotation quickly
enough.









Bye
Andreas

On May 11, 4:30*pm, Andreas Maurer wrote:
On Mon, 11 May 2009 09:53:56 -0700 (PDT), bildan
wrote:

This led to the NACA standard spin recovery technique which called for
anti-spin rudder while holding full up elevator until the auto-
rotation slowed and only then applying down elevator. *The reasoning
was that full up elevator exposed more of the rudder to high energy
flow.

Trying this method in nearly any glider is a very safe way to get
killed.

I am pretty sure that most glasss gliders of the least 40 years will
not recover from a spin if the elevator is held fully up during the
recovery attempt - they simply are not going to stop rotation quickly
enough.

Bye
Andreas

Read more carefully. I didn't write anything about trying a recovery
with full up elevator. I wrote "until the auto-rotation slowed and
only then applying down elevator"

On Mon, 11 May 2009 15:51:27 -0700 (PDT), bildan
wrote:

Read more carefully. I didn't write anything about trying a recovery
with full up elevator. I wrote "until the auto-rotation slowed and
only then applying down elevator"

I know - what i wanted to say is that the rotation isn't going to slow
down significantly in many gliders if you keep the elevator pulled up.

Not to mention that a significant forward elevator is going to induce
some serious negative G once the glider snapped out of the spin.

Bye
Andreas

Andreas Maurer wrote:

Not to mention that a significant forward elevator is going to induce
some serious negative G once the glider snapped out of the spin.

With the ASK-21 you can find yourself in a sudden inverted spin if you
push the stick fully forward.

On Tue, 12 May 2009 01:27:30 +0200, John Smith
wrote:


With the ASK-21 you can find yourself in a sudden inverted spin if you
push the stick fully forward.

So far I didn't dare to try this...


Bye
Andreas

In message , Andreas Maurer
writes
On Mon, 11 May 2009 09:53:56 -0700 (PDT), bildan
wrote:


This led to the NACA standard spin recovery technique which called for
anti-spin rudder while holding full up elevator until the auto-
rotation slowed and only then applying down elevator. The reasoning
was that full up elevator exposed more of the rudder to high energy
flow.

Trying this method in nearly any glider is a very safe way to get
killed.

I am pretty sure that most glasss gliders of the least 40 years will
not recover from a spin if the elevator is held fully up during the
recovery attempt - they simply are not going to stop rotation quickly
enough.

I heard about some folks spinning a K21 with the weights kit, and they
nearly ended up bailing out. Later the instructor concluded that they
hadn't been pushing the stick far enough forwards during the
unsuccessful attempts.

--
Surfer!
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