Cirrus spin recovery was tested. Was: Why does airspeed change when I adjust the prop?

BDS wrote:
"Jim Logajan" wrote

"Question: Has any spin testing been conducted in the CIRRUS airplanes?

CIRRUS Engineer: Yes, CIRRUS has done spin testing in both the SR20 and
the
SR22, and we've done a variety of spins in both models.

That's interesting. I wonder who the "test pilot(s)" were that thought that
it was "virtually unrecoverable", and why they made that comment.

I spoke with the Mooney test pilot who did spin testing in the 201. He
said it was not a fun day, and he didn't look forward to it. The manual
says that spins beyond one turn may not be recoverable (the test pilot
only had the guts to do one turn ). However, even at that it passed
the FAA's spin test requirements for normal category. Makes you wonder
what's up with the Cirrus that that wasn't even desirable.

-Robert

Robert wrote :
The manual
says that spins beyond one turn may not be recoverable (the test
pilot
only had the guts to do one turn ).

That sounds fishy. One turn is all that the FAA requires, but I
doubt the pilot was scared to do more. When spin testing a design,
aircraft are normally equipped with spin chutes that deploy from the
tail and arrest the spin. They can then be jettisoned for a normal
approach and landing. They are pretty common in GA spin testing. My
bet is that the test pilot was instructed by Mooney to do the one
required turn and call it a day.

John Galban=====N4BQ (PA28-180)


--
JGalban
Posted at www.flight.org

"BDS" wrote in message
et...

I found this on the Grumman Yankee which I recalled had a nasty reputation
for spins and yet was being used as a primary trainer:

"The original American Aviation AA-1 Yankee developed a poor reputation
for
safety in its first years of production (1969-71). The aircraft was
designed
purely to fill the role of a personal transportation and touring aircraft
and not a trainer, but many of the early production models were purchased
by
flying schools. The appeal of the AA-1 to schools was obvious - compared
to
the competition, the AA-1 was faster, cost less to purchase and maintain
and, most importantly, had more student-appeal with its sliding canopy and
fighter-like looks.

Many of the early school accidents were related to spin-training. Once the
AA-1 entered a fully developed spin and exceeded three turns, it was
usually
not recoverable. The AA-1 had been spin-tested as part of its
certification,
but in 1973 the FAA issued Airworthiness Directive 73-13-07 ordering the
aircraft placarded against spins."


Analysis and comparison of aircraft spin characteristics and the records:
http://www.aopa.org/asf/asfarticles/2003/sp0302.html

"Matt Barrow" wrote:
Analysis and comparison of aircraft spin characteristics and the
records: http://www.aopa.org/asf/asfarticles/2003/sp0302.html

An interesting article, thanks.

Bds,

Would this stop me from buying one - no. Would it stop me from spinning one
on purpose knowing that I might have to trash it to recover - yes.


I'm with you. Now let my find that stash of cash...

--
Thomas Borchert (EDDH)

George,

If the aircraft cannot be recovered from a spin who would buy such a
beast ?


If that were the case, who'd certify it?

--
Thomas Borchert (EDDH)

Peter Dohm wrote:
I never understood Calculus I until I took Calculus II.
I would have gained far more useful knowledge if they had allowed my
to
skip Calc II and Calc III and just take Calc I three times.

Calc was NASTY. But that @##$%^&* Matrix Algebra was WORSE.

Calc I was easier than Theory of Caclulus (graduate level course that
involved proofs of the theory of limits)

john smith wrote:
Peter Dohm wrote:
I never understood Calculus I until I took Calculus II.
I would have gained far more useful knowledge if they had
allowed my
to
skip Calc II and Calc III and just take Calc I three times.

Calc was NASTY. But that @##$%^&* Matrix Algebra was WORSE.

Calc I was easier than Theory of Caclulus (graduate level course that
involved proofs of the theory of limits)

In my day we had to solve non-linear differential equations while walking
from home uphill to class in a snowstorm. And then solve systems of
nonlinear second order differential equations while walking uphill from
class to home in a sandstorm! Those M. C. Escher topology landscapes were
tough on our three-year-old legs.

;-)

The only/best thing I got out of Theory of Calculus was my wife.

Jim Logajan wrote:
john smith wrote:
Peter Dohm wrote:
I never understood Calculus I until I took Calculus II.
I would have gained far more useful knowledge if they had
allowed my
to
skip Calc II and Calc III and just take Calc I three times.
Calc was NASTY. But that @##$%^&* Matrix Algebra was WORSE.
Calc I was easier than Theory of Caclulus (graduate level course that
involved proofs of the theory of limits)

In my day we had to solve non-linear differential equations while walking
from home uphill to class in a snowstorm. And then solve systems of
nonlinear second order differential equations while walking uphill from
class to home in a sandstorm! Those M. C. Escher topology landscapes were
tough on our three-year-old legs.

;-)

"john smith" wrote in message
...
The only/best thing I got out of Theory of Calculus was my wife.


Hmmm...me too. I married the professors daughter.