Mod 72 provides added strength, in particular in bending, by adding
thickness to the wall of the tube. It is the added thickness that provides
the additional strength and because there are no forces that would tend to
move the insert along its axis (relative to the original tubing) there is no
need for bonding it into the frame.
Epoxy used to create a bond between the original tube and the insert would
be a weak annular region that could allow the original tube to deform,
albeit very slightly, if the epoxy were to extrude out of the gap.
As for corrosion protection, remember that the original frame is powder
coated only on the exterior so nothing much changes when adding the insert.
Best regards,
Rob Housman
A070
Airframe complete
Irvine, CA
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Robert Borger
Sent: Friday, January 19, 2007 5:48 AM
Subject: Europa-List: Mod 72 question
Fellow Europaphiles,
The Mod 72 topic has become too quiet. I've decided to give it a poke and
see if I can wake it up again.
I have all the various bits for Mod 72 on order. Etching primer, ACF-50,
16.5 mm hand reamer & Mod 72 kit.
I am wondering why the heavy wall tubing is not bonded in place with
something like Redux.
Is the press fit good enough to support the frame?
Would it be better to Redux the insert in place? Better support and
corrosion protection?
If not, why not?
Good building and great flying,
Bob Borger
Standing by, wearing my nomex undies, ready for the flames.
P.S.
The reamer will be available for loan to any Europa builder in the U.S. or
Canada who needs it for Mod 72.
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