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Date: Mon, 07 Dec 2009 11:51:38 -0500
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Subject: Re: basic aerobatics in a 360
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Unless you have an inverted oil system, I would keep at least 0.1 g on 
the airplane.

Among other things, you might lose some hydraulic fluid out the vent on 
the pump and on the master cylinders.  But of more concern than that 
small mess would the metal-on-metal inside your engine, or potentially 
an engine overspeed caused when oil starvation to the prop governor 
allows it to do unpredictable things.

I'm fortunate to have gotten most of my aerobatic urges worked out in 
the Air Farce, but if you really want to do serious acro I recommend you 
trade hours with a friend who owns an airplane designed for negative g 
flight.

Cheers,

Bill Reister


Keith Smith wrote:
> I'm thinking of doing some relatively basic aerobatics in my 360,
> basically loops, barrel rolls, and anything else with continuous
> positive G.
>
> The area where I'm a little hazy is any maneuver with brief moments of
> zero or even -1G.  Are these to be COMPLETELY avoided, or is it ok for
> very brief stints.  I'm concerned about the prop and engine.  My
> knowledge of the internals of the engine are weak, but from the little
> I know, without an inverted oil system, prolonged inverted flight
> isn't an option.  My question is, is 0 to -1G acceptable for 1-2
> seconds?   I'm thinking here of aileron rolls, or cuban eights.
>
> I don't have my heart set on doing those, per se, but just want to
> know where it would be smart to draw the line. I know the airframe can
> handle all of that, and then some, it's a question of the engine and
> prop.
>
> Thanks for any advice.
>
> Keith
> N360JH LNC2
>