[NSRCA-discussion] Full Flying Stab

[J N Hiller]

I was thinking of using a fixed pivot tube and rotate each half taking
advantage of the longer bearing surface using a full pull-pull cable control
from a forward bell-crank similar to my present elevator control system. I
think I will start detailing the construction and see how it works out. It's
not a lot different than an adjustable stab but the devil is always in the
details. Before using CAD I sometimes erased holes in the paper before
committing. I don't know how much deflection will be needed. The glider guys
say not much, which offers considerable rotational reduction from the servo
reducing the effect of gear-train backlash also. Might be worth a try. A
couple tabs on the stab root rib could fix the stabs in place and elevators
come right off with a pass through the table saw.
Jim

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of
rcmaster199 at aol.com
Sent: Friday, August 14, 2009 6:03 PM
To: nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] Full Flying Stab

Jim,

Pivoting at the AC, statically balancing at least 70% (saves some weight in
the tail) and  driving it at maximum mechanical advantage (practical that
is) should give good results from physics point of view.

Try two smaller servos driving each half and mount them as far back (either
in the stab or fuse) as practical. Push rods normal to the stab

MattK


--- On Fri, 8/14/09, J N Hiller < jnhiller at earthlink.net
<mailto:jnhiller at earthlink.net> > wrote:

From: J N Hiller < jnhiller at earthlink.net <mailto:jnhiller at earthlink.net> >
Subject: [NSRCA-discussion] Full Flying Stab
To: "NSRCA Mailing List" < nsrca-discussion at lists.nsrca.org
<mailto:nsrca-discussion at lists.nsrca.org> >
Date: Friday, August 14, 2009, 12:00 PM
I'm working on a new pattern design and would like some input on the
feasibility of using a full flying stab. Servos are tighter and stronger now
and the travel curve is more adjustable. Would it still be too loose and
hunt or do they just not work?
What do you think?
Jim Hiller

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