Hi! Will
The Mod 70 only allows 4mm side play.
I understand that the part that broke ( Having been previously under
extraneous circumstances!) was actually the adjuster screw thread,
prompting further calculation of the members themselves. As to whether
it was vertical stress or lateral stress I'm unaware, but the maximum
4mm side play may give the clue! With the cables tensioned correctly
there's no side play.
Regards
Bob Harrison G-PTAG
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of William
Daniell
Subject: RE: Europa-List: Mod 70
<wdaniell@etb.net.co>
For those of us not covered by the PFA and who have a little difficulty
and
cost getting stuff from the UK.
As I understand it the Tailplane mass balance arm broke at the lower
strut
where it joins by means of the adjustable connector to the TP torque
tube.
The issue is not the cables but the strength (or perhaps more accurately
the
fatigue resistance) of the mass balance arm in the face of vertical
stresses.
Could this be solved by simply reinforcing the mass balance arm? For
example by welding a sleeve over the lower tube.
I share Fred's concern that continuous friction and sideways play even
if
only 8mm can not be a good situation .in an airplane context.
Will
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Fred
Fillinger
Subject: Re: Europa-List: Mod 70
> "R.C.Harrison" <ptag.dev@tiscali.co.uk> wrote:
> ...
> but it doesn't mean that slides are a more
> professional fix to our solution in the first place.
I can agree there, if one will be able to feel the friction.
Especially if one doesn't fly a lot of hours, it seems the
counterweight will be in a permanent, "frictiony" rust condition. I
would have suggested Teflon, rather than phenolic.
Reg,
Fred F.
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