RE: Europa-List: Mod 73

[Karl Heindl <kheindl@msn.com>]

Pete and Bud=2C


I don't agree with the friction theory. My tailplanes slide on and off with
 ease. If anything=2C it is easier now=2C as there is no lignup problem wit
h the two separate tubes. The torque tube is always lightly greased for tha
t reason=2C but also to keep corrosion of the torque tube at bay.e

I don't think that weight is an issue here. I use an alu tube and the diffe
rence between that and the shorter steel tube is really minimal. 

Actually=2C an increase in tail weight is beneficial for many Europas=2C wh
en you consider all the add-ons up front=2C like cs propeller=2C instrument
ation=2C autopilot=2C cabin heat=2C you name it=2C compared to the original
 80hp mono=2C on which the cg calculations were based.


Karl


Subject: Re: Europa-List: Mod 73
Date: Thu=2C 15 Oct 2009 09:19:16 -0400
From: pjeffers@talktalk.net


Karl=2C

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 ma
de by the mod in that disbondment is now prohibited=2C 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=2C 15 Oct 2009 12:19
Subject: RE: Europa-List: Mod 73


Surely=2C the objective of mod 73 was to prevent the tailplanes from moving
 outboard. There is no guarantee that this 'plaster' stuck onto stainless i
s going to last the life of the aircraft.
What is wrong with my simple fix of replacing the TP5 with a long TP5 reach
ing up to the TP6=2C ensuring that the TP6 cannot ever move inboard.
This also fixes another problem=2C namely the disbonding of the TP5s =2C wh
ich has happened to me on both tailplanes.
BTW=2C I have never noticed any tendency of the tailplanes migrating outboa
rd. Whenever I remove the tailplanes at the end of my season=2C the pip pin
s are still as free and easy as when they went in.

Karl


> Date: Thu=2C 15 Oct 2009 10:43:46 +0100
> From: grahamsingleton@btinternet.com
> To: europa-list@matronics.com
> Subject: Re: Europa-List: Mod 73
> 
ternet.com>
> 
> Fred Klein wrote:
> >
> Fred
> imho John's solution is adding more engineering to fix a symptom. I 
> would prefer removing the cause=2C which is relying on the adhesion of 
> epoxy to stainless steel. Purely mechanical=2C no true bond. Better to 
> make a glass tube properly laid up onto the foam core and the ribs=2C 
> lined with a full length tube with lightening holes. Much more expensive

> in labour but hey=2C we can always pay ourselves a bit less that day =3B-
)
> The problem is the stainless inserts are not always circular and a bit 
> of swarf from the drillings make them jamb. Trouble!
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> 
> 
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