in 1999 I glued my TP12 on to the TP4 torque tube using Loctite 603,
because I had some play (less than 1/2"); today and some 700 hours later
I can report that this fix proved itself as I have 0 play!
Klaus
(MkI, OE-CKD)
*Date: * */Feb 21, 1999/*
*From: * */Klaus Dietrich <101613.3377@compuserve.com>/*
*Subject: * /*Re: TP6's
</searching/getmsg_script.cgi?INDEX=9323947?KEYS=loctite?LISTNAME=Europa?HITNUMBER=93?SERIAL=01571730176?SHOWBUTTONS=NO>*/
*I finaly decided to repair my play in the TP 12 by glueing it to
the TP 4 torque tube. I used Loctite 603 (for lightly oil
contaminated parts, shear strength 3.700 psi) which I applied on the
torque tube on the 10 mm inbord of TP 12. I did this only after
careful in-situ testing how to soften the glue again in case of
disassembling without heating the aircraft structure or softening
the Redux holding the TP 11 bushes. In case you are going this
route, here is the way to go: take a halogen bulb of 150W (size: 75
mm long) which will be centrally mounted between two discs (made of
some scrap of the firewall material) with a diameter of 34mm. The
discs are hold together by two threaded wire rods (2mm diameter)
each with a nut on both ends. For the electrical contacts I
disassembled the halogene spot (cost Euro 5,--) and used the small
metall contacts which I mounted centrally to the discs. The electric
cables which are crimped on the contacts are running on each side of
the assembly. The complete assembly is than slided into the torque
tube and placed exactly under the TP 12 well inboard of the TP 11
bushes, where the glue is. One cable will go to the left and one to
the right end of the tube. When you switch on the light, very
concentrated heat will be emitted by the bulb which heats the tube
from the inside on a length of not more than 70 mm. The Loctite
needs about 150=B0C to soften completely. This temperature will be
reached easily after 2 to 2,5 minutes. You can than slide the TP 12
out again and swich off the heat. The "firewall discs" help to
concentrate the heat and the TP 11 bushes don't get any more than
"handwarm" (not more than 40=B0C). Thanks to Jim N. for this idea!
It works perfectly. For those who are still building, make shure you
are using anchor nuts to fix the servo motor and the trim assembly
below as well as shackles or turnbuckles for the safety cables which
are holding the counterwight......this will asure you an easy
disassembly of all the "mechanics" in the back of the fuselage;
something which inevitably will happen sooner or later.....
Obviousely you'll need also an access panel at this very strategic
place.....You may also file the heads of the pins square to be able
to turn them with a spanner to position the hole of the split pin.
Have fun...it's just a 10 minutes fix (I'm Ivan's disciple....) Klaus *
--
Klaus Dietrich
Oracle Financing EMEA
Tel/Fax: +43 1 33 777 825
http://www.oracle.com/financing
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