Karl,
When taking the tailplanes on and off the friction produced by having 6 or 7
times
the contact are between the torque tubes and the TP bushes would be enormous
and add a significant weight penalty to an area with great lever arm IE CG
considerations.
Re the plaster stuck onto stainless. This is the significant improvement made by
the mod in that disbondment is now prohibited, by introduction of a physical
barrier to migration of the bush.? Previously it was only held in place by the
adhesion of stainless to structure in one linear direction.
Pete
-----Original Message-----
From: Karl Heindl <kheindl@msn.com>
Sent: Thu, 15 Oct 2009 12:19
Subject: RE: Europa-List: Mod 73
?
Surely, the objective of mod 73 was to prevent the tailplanes from moving
outboard.
There is no guarantee that this 'plaster' stuck onto stainless is going to
last the life of the aircraft.
What is wrong with my simple fix of replacing the TP5 with a long TP5 reaching
up to the TP6, ensuring that the TP6 cannot ever move inboard.
This also fixes another problem, namely the disbonding of the TP5s , which has
happened to me on both tailplanes.
BTW, I have never noticed any tendency of the tailplanes migrating outboard.
Whenever
I remove the tailplanes at the end of my season, the pip pins are still
as free and easy as when they went in.
?
Karl
?
> Date: Thu, 15 Oct 2009 10:43:46 +0100
> From: grahamsingleton@btinternet.com
> To: europa-list@matronics.com
> Subject: Re: Europa-List: Mod 73
>
>
> Fred Klein wrote:
> >
> Fred
> imho John's solution is adding more engineering to fix a symptom. I
> would prefer removing the cause, which is relying on the adhesion of
> epoxy to stainless steel. Purely mechanical, no true bond. Better to
> make a glass tube properly laid up onto the foam core and the ribs,
> lined with a full length tube with lightening holes. Much more expensive
> in labour but hey, we can always pay ourselves a bit less that day ;-)
> The problem is the stainless inserts are not always circular and a bit
> of swarf from the drillings make them jamb. Trouble!
>=====================
>=================
>
>
>
|