----- Original Message -----
From: "ami mcfadyean" <ami@mcfadyean.freeserve.co.uk>
Subject: Re: Front Bearing setup
>
> -----Original Message-----
> Subject: Re: Front Bearing setup
>
>
> >Duncan if
> >the expansion you got to the tufnol would have occurred with a graphite
> >lubricant
>
> I wouldn`t know. Unless the graphite is in an oil/grease carrier.
>
> >small hole in the top of the tufnol bearings to
> >allow the insertion of a tubular applicator to inject atomised grease
with
> >a medium that later evaporates leaving the grease in place.
>
> The solvent carriers in many spray lubs. REALLY make the Tufnol swell. But
> it does seem to go back down with time as the solvent slowly disappears.
>
> > Is the general
> >consensus that the friction comes from the tufnol swelling throughout its
> >thickness which effects the rear face of the CS03 bush against it, or is
it
> >the shrinking nature of the hole in the bearing constricting on the CS03
> >bush?>
>
> The swelling takes place mostly perpendicular to the direction of the
fabric
> in the Tufnol. There was plenty of radial play left in mine. Although
> conical misalignment of either bearing can cause friction in addition.
>
> Tightening of the four bolts on the front bearing seems to pull it well
out
> of line, even when its been set up square on a (by now) well cured flox
pad.
>
> I liked Fred Fillinger`s idea of using fishing line to maintain
> axial/conical AND radial alignment and would certainly try this on the
back
> bearing.
>
> Even when all this is done, accurate set up in the inner module is still
> just as critical.
> Nevertheless, I really think its worthwhile on any aircraft to spend alot
of
> time in getting the controls friction-free and free from slop; it makes
for
> far sweeter handling, especially on a first flight when control friction
can
> mask out-of -trim asymmetries.
>
> Duncan McFadyean
>
>
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