Indeed - training in 115FN & 216AR with Rich at Attitude. I like
the Grob a lot except for the constant stink of avgas. I really like Rich
as an instructor. And Attitude have an extremely cool collection
of aircraft to think about for later...

John

"Donovan" wrote in message
om...
"John Harper" wrote in message
news:1060020100.727307@sj-nntpcache-5...
Did my first accelerated spins yesterday (in a Grob). Woohoo.
Unfortunately my stomach wasn't wild about them, so I only
did a couple. But I did get to thinking about the aerodynamics
of them (maybe as a way to forget my nausea!), and I had a
couple of questions which I wondered if anyone here can answer.

We recovered by un-accelerating the spin (stick slowly back) then
a normal recovery. Even so it was pretty eye-popping and stomach
churning.

What would happen if you put in full anti-spin rudder while in a
stable accelerated spin? There seem to be four possibilities:

-- rudder stall
-- rudder/vertical stab falls off (shades of AA587)
-- the yaw is enough to break the spin (unstall the downgoing wing).
But the yaw will rotate the airplane in the vertical plane, so now the
nose will be pointing horizontally (or at least not nose down) with
some random bank angle (-180 - +180) when suddenly both wings
start flying again. This would really be the unusual attitude recovery
from Hell since you could really be absolutely anywhere and massively
disorientated with it.
-- the yaw isn't enough to break the spin (gentle rudder application).
This seems the most intriguing of all. Since you have airspeed, the
rudder
will cause continuing yaw - I guess flattening the spin somewhat. But
now
you have full anti-spin rudder which means that recovery options are
limited! Presumably recovery would be: full pro-spin rudder, stick back
to flatten the spin, then normal recovery - if you have any altitude
left.

Anyway I'd appreciate any comments from people who've tried any of
this - of course I'll be asking my instructor next time I see him too.

Thanks,

John
of all

Hey John, You wouldn't happen to be doing your training at Attitude
Aviation in Livermore would you?

The reason I ask is there aren't too many places that use the Grob
115C. If so, who is your instructor? I did some aerobatic training
there last year in the Grob, very cool plane. Only thing I don't like
about doing acro in the Grob is the fuel smell that gets in the
cockpit during manuevers. I flew with Rich Perkins and an older
instructor who name has slipped my mine at the moment.