>To get the record straight I'll ask Wolfgang
>to provide us with the facts thru aus-soaring.
Hm, yes, Noel, I think I discussed the topic of inverted spinning and the
associated problems with you a few years ago, when my aerobatics training
was still 'fresh' ... I did the course for the German aerobatics licence
(which is basically aimed at competition aerobatics - things like proper
use of the 'box' aerobatics airspace and the scoring criteria etc. are
taught and used right from the start) back in 1993 ... we used an ASK 21
and a Twin Astir II as the dual trainers and then 'advanced' to a couple of
LO-100s and one of the Cirrus K (K as in 'klipped wing' ;-) conversions.
The first three days of the course were solely dedicated to inverted flying
- using half-rolls to get in and out at first, then progressing to half
loops - until everybody had about 2 hours total time inverted.
An important part of the training where the two 'dangerous' ends of the
speed spectrum - ie. what to do when you find yourself inverted, going down
on a 45 degree diagonal, rapidly approaching Vne (Don't ever try to PULL it
out !!!!) - and the behaviour of the various aircraft in stalls, etc.
It was quickly shown that none of the dual trainers would stall 'staticly'
and any c.g. location - one would simply run out of forward stick and reach
a 'minimum static inverted speed' ... dynamic stalls (as precursor training
for snap-rolls) were something different. At least the ASK-21 we used
(D-4491 'FK') would quite happily to about one and a half spinning turns
inverted, if the snap roll was not initiated correctly ... and the
important lesson the instructor wanted us to know was that the entry phase
of an inverted spin tends to look very much like a 'normal' spin, so that
you really have to concentrate to realize/remember what kind of spin you're
in (ie. upright/inverted and left/right) to time the exit correctly (keep
in mind that in competition aerobatics a half spinning turn is used quite
often as a 'reversal' maneuvre to keep inside the scoring box - and when
you're even a bit out of line, you will incur severe penalties).
To sum it all up: the ASK-21 did not exhibit any 'nasty' stalling/spinning
behaviour in 'normal' inverted flight, but using dynamic maneuvres and
'violent' control inputs it was possible to provoke sufficiently
'interesting' behaviour to prepare the candidates for the thoroughbred
aerobatics ships .... for most of us this was quite surprising, as in
normal flight even the worst abuse does not really make the K21 depart from
fully controlled flight ...
I hope that clears up the matter a bit,
Cheers,
Wolfgang
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