Jim Thursby confirms that the twist and misalignment of the torque tube
witness marks are still present, and my own measurements confirm the latter.
The builder's manual procedures state that you should drill ONE hole, then
insert a rod and align it to the firewall, then mark and drill the second.
Jim also posted about the twist back in 1997. He experienced bushing
binding when he removed the jig he used to take out the twist. A portion
may be removed, but not all, necessarily. Miles' point that the top holds
things in place is true, but there's a bit of work between installing the
torque tube and bulkhead and attaching the top. Basically, you can't remove
the anti-twist jig until the top is on.
Shaun
----- Original Message -----
From: "Miles McCallum" <milesm@avnet.co.uk>
Subject: Re: tail planes
> >So if you start stressing or pre-loading the fuselage to remove
> > twist, then install the stabilator tube, then remove the mechanism used
to
> > remove the twist, the fuselage then trying to return to its original
> > position, the bushings may become unaligned and bind.
>
> If it's held in place by bonding on the top, shouldn't be a problem....
>
> >Very important, establish
> > your datum planes being the bottom fuselage including the cockpit
module,
> > the wings and the stabilator to make sure all are parallel. The tail
being
> > vertical is important, but if close, it is second to these planes being
> > parallel.
> >
> I've found that the aeroplanes don't care - I had a luscombe that had
> the stab canted over by about 5 - but flew (and still flies)
> beautifully. However, they eye of the beholder is another matter.....
>
> M
>
>
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