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david.corbett5(at)btinter
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 Posted: Sun Nov 19, 2006 2:02 am Post subject: A query re LG 01 |
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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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ptag.dev(at)tiscali.co.uk
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| Posted: Sun Nov 19, 2006 3:20 am Post subject: A query re LG 01 |
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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(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of David.Corbett
Sent: 19 November 2006 10:01
To: Europa Forum
Subject: 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 [quote] -- Please Support Your Lists This Month -- (And Get Some AWESOME FREE Gifts!) November is the Annual List Fund Raiser. Click on the Contribution link below to find out more about this year's Terrific Free Incentive Gifts provided by: * AeroElectric www.aeroelectric.com * The Builder's Bookstore www.buildersbooks.com * Aeroware Enterprises www.kitlog.com * HomebuiltHELP www.homebuilthelp.com List Contribution Web Site --> http://www.matronics.com/contribution Thank you for your generous support! -Matt Dralle, List Admin. - The Europa-List Email Forum - --> http://www.matronics.com/Navigator?Europa-List [b]
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ami(at)mcfadyean.freeserv
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| Posted: Sun Nov 19, 2006 5:44 am Post subject: A query re LG 01 |
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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.
[quote] ---
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