A couple of sacrificial annodes would resolve the issue of corrosion I
think, same as on outboard motors for boats
but it is a good point, or if you had the clearance, maybe powder coating
the torque tube, or caster oil, only problem
with caster oil is it remains tacky, as all the data i have seen on caster
oil suggests the only way to remove it completely from a metalic
surface is to machine about 1mm off the surface
you could simulate an accelerated situation by putting the old bush (tp5)
and a piece of the alloy tube in a salt water bath for a week
and see what happens, ideally in the same relation as in the aircraft ie one
inside the other.
just had another thought, maybe a teflon treatment might do the trick on the
torque tube or both if you have done the mod yet
it would make the tube real easy to get on and off too.
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Peter Zutrauen
Sent: Tuesday, 23 October 2007 9:11 PM
To: europa-list@matronics.com
Subject: Re: Europa-List: Mod 73 alternative
Hi Karl,
The only concern I would have is dissimilar metal corrosion on the torque
tube. Not sure how to prevent it between the alu and the torque tube plating
besides lots of grease. I suspect that the grease will not be enough
however. With the sliding on/off and then sitting in one spot, I would
expect some metal on metal contact with the grease being wiped off. Hope
I'm wrong, but I've seen too much dissimilar metal corrosion in a variety
of situations.
Cheers,
Pete
On 10/22/07, Karl Heindl <kheindl@msn.com> wrote:
My original plan was to replace both TP5 and TP6 with a single tube.
After removing the TP5 I realized that there was no point at all in
removing
the TP6. It is only necessary to ensure that it cannot move inboard,
which
would then allow the TP12 to disconnect from the tailplane etc. etc.
I simply replaced the TP5 with a longer alu tube from ACS, part number
03-37900. This butts right up against the TP6, and there is no way this
can
ever move inboard. The tube is made of 6061 T6 aluminum.
Advantages:
A straightforward mod.
No cutting into the tailplane.
No misalignment problem with TP5 and TP6.
A permanent solution. ( assuming that there was a problem in the first
place.)
If anyone is interested I can give more details on how I did it.
Cheers,
Karl
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