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Aerobatics, just say NO to inverted Spins! HOW TO PART III

 
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ronlee(at)pcisys.net
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PostPosted: Sat Jan 20, 2007 3:48 pm    Post subject: Aerobatics, just say NO to inverted Spins! HOW TO PART III Reply with quote
Quote:
Number one, acro in a RV is not F-16, Pitts or F-14
acro. I think some folks have watched top gun too
much (the inverted spin scene where "Goose" dies).


My recollection is that scene was a flameout which caused a flat spin.
They were upright and Goose hit the canopy before it was totally gone.

Ron Lee

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rv7(at)b4.ca
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PostPosted: Sat Jan 20, 2007 4:11 pm    Post subject: Aerobatics, just say NO to inverted Spins! HOW TO PART III Reply with quote
On 15:47 2007-01-20 Ron Lee <ronlee(at)pcisys.net> wrote:
Quote:

> Number one, acro in a RV is not F-16, Pitts or F-14
> acro. I think some folks have watched top gun too
> much (the inverted spin scene where "Goose" dies).

My recollection is that scene was a flameout which caused a flat spin.
They were upright and Goose hit the canopy before it was totally gone.

Perhaps the confusion was from the way the scene was filmed, not the way it
was supposed to have happened. The scene was filmed by an aerobatic pilot
flying an inverted flat spin. My recollection is that the pilot did not
recover from that spin, due to unexpected changes in spin performance with
the camera rig attached. He died filming it.

In the movie, however, Goose dies due to hitting the canopy during the
ejection, not due to hitting his head during the (upright) spin.

-Rob

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panamared5(at)brier.net
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PostPosted: Mon Jan 22, 2007 9:36 am    Post subject: Aerobatics, just say NO to inverted Spins! HOW TO PART III Reply with quote
George

Thanks for the reply.

I am not worried about an accidental inverted spin. But, I am trying to
practice for the future when I have to fly one in and IAC contest. I know,
I probably will not be flying an RV at the level that requires an inverted
spin, but the best way to get good at something is to practice.

Your point is well taken, maybe due to the design the RV will not even do
an inverted spin. I'll let you know.

Bob
Quote:
Number one, acro in a RV is not F-16, Pitts or F-14
acro. I think some folks have watched top gun too
much (the inverted spin scene where "Goose" dies).

RV's are stable and WANT to fly right side up.
I am not going to explain basic aerodynamics,
but due to wing dihedral, design (NACA 23013.5) and
pitch, yaw, roll controls and stability with proper CG,
RV's are stable in any attitude. RV's also resist spinning
unless intentionally spun.

Spins: RV's don't like to even spin right side up,
much less inverted. You have to hold controls
aggressively and keep and keep them there to the
control stops. Once you release or neutralize the
controls it will stop spinning in most cases. Some RV's
(power on, to the left, fully developed +3 turn stall)
might need a touch of anti-spin rudder. By all means be
familiar will basic stall / spin recovery.

INVERTED SPIN: I have not tried it in a RV
and doubt you can even do it intentionally, due to lack
of elevator authority and the basic design of the plane.
Again dihedral, airfoil design and CG (which is still the
same inverter or right side up) makes the plane want to
recover naturally in a nose down attitude right side up.
The dihedral will naturally make the plane roll upright.
Also to spin you need a yaw input or forces, ie rudder.
Leave the rudder alone (as I said before) for beginners
in rolls and loops.


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