Heavy engines (like the Subaru) had to have the top arms reinforced.
This was done with 3/16" wall thickness material.
Sleeving on the inside takes a lot more material than you might think to
make any appreciable difference to the bending strength of the tube.
Sleeving on the outside is of course different matter.
There is an 'MPD' requiring inspection of these tubes, where heavier
engines are fitted. Although it is the composite that the arms are
bolted to that is equally "lacking".
Duncan McF.
----- Original Message -----
From: R.C.Harrison
To: europa-list@matronics.com
Sent: Sunday, November 19, 2006 11:19 AM
Subject: RE: Europa-List: FW: A query re LG 01
Hi! David.
I'm just a little mystified about "Fore and Aft" description.
For the record I also fitted thick walled close fitting aircraft
quality tubes and bonded with redux into the LG01 frame adjacent to the
"connectors of the engine mount frame" extended aft to the first bolt
attachment of the tunnel top.
I did it for no reason other than a "gut feeling" of "belt and braces"
addition.
It seems like you are saying that yours are extended right through and
welded into position....good fix I'd say ! Except I'd pressure some
runny Redux down the annulus between the tubes from the front.
Regards
Bob Harrison G-PTAG
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of
David.Corbett
Sent: 19 November 2006 10:01
To: Europa Forum
Subject: Europa-List: FW: A query re LG 01
Classic Europa serial 76 (G-BXIJ) was completed in 1997, and
subsequently sold to Robin James; the original owner, who built the
aircraft, has since died.
The engine has recently been removed from this aircraft to have its
sprag clutch changed. Whilst the engine was out - the work was done by
Adrian Lloyd at Shobdon - it was noted that the top horizontal fore and
aft tubes of the landing gear mounting frame (LG 01) have reinforcement
sleeves fitted. These sleeves, which run the full length of the LG 01
top tubes, are not secured to the outer tube at the front, but are very
neatly welded at the back end.
Robin, who is a professional engineer, reckons that the sleeves are
4130 material, and his calculations suggest that there would have been a
24/1000 clearance between the outer and inner tubes when fitted.
Does any early classic builder - or even you, Nev - have any recall as
to why reinforcement tubes might have been fitted to this or other early
model LG 01's? Andy has suggested that the builder might have made a
mess of drilling the holes for the attachment bolts in the top tube, but
Adrian has looked carefully in that area and confirms that this does not
look to be the case.
Any comments will be gratefully received.
David
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