---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Sun 09/13/20: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:50 AM - UK DOTH 2 (clivesutton) 2. 02:29 PM - Re: Rear wing root socket problems (=?UTF-8?Q?Erik_Dahlb=c3=a4ck?=) ________________________________ Message 1 _____________________________________ Time: 03:50:26 AM PST US Subject: Europa-List: UK DOTH 2 From: "clivesutton" Anyone up for a DOTH trip meeting tomorrow Monday 14th Sept to North Coates (Lincolnshire coast) , arriving midday-ish TBC? Haven't been there before, but looks like a gem: 760 x 20m grass, small museum, 5 to land. EGD307 nearby but local arrangements in place. See http://www.northcoatesflyingclub.co.uk/ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=498331#498331 ________________________________ Message 2 _____________________________________ Time: 02:29:28 PM PST US Subject: Re: Europa-List: Rear wing root socket problems From: =?UTF-8?Q?Erik_Dahlb=c3=a4ck?= Thank you Bud, Duncan and others for your input. David Stanbridge reached out to me in response to my post here and I've E-mailed them the pictures as well. Their recommendation was to remove the rust and oil it to prevent further corrosion. Now, my local mechanic and I decided to have me paint the W26A using "hammer paint" after sanding. Here's to hoping that the parts will still fit. It shouldn't rust anymore anyway... The way I recall it, the W26B was correctly oriented when we found the totally broken one. However, it had almost fallen off so I can't be sure. The port side one however, which I later discovered to be cracked as well, was correctly oriented. That is if I remember correctly. I might again here just be assuming it was installed correctly due to having read the builder's manual afterwards. And yes, I am a member of the Europa Club and will sure check out the 914-tips, thank you all. / Erik On 2020-09-07 17:10, D McFadyean wrote: > > The (substantial) wear marks on W26A show that is was installed the > correct way around. > > The wear mark on the inside vertical surface of W26 just above the > central bolt indicate that at some point W26A was leaning heavily on > W26 in a 'negative g' direction of loading, which may explain how it > then broke i.e. the weight of the wing transmitted in bending through > the lift pin caused W26A to lever against W26. > > That wouldn't occur during a normal flight maneuver and when properly > rigged. Perhaps the downward leverage occurred during derigging after > removing the spar pins, and assuming the spar cups were misplaced. > > I'd check the lift pins for bending too and that these are not angled > (or bent) above the centreline of the inboard spar projections (and/or > that W26 has been set vertically). > > > Duncan Mcf. > >> On 07 September 2020 at 14:31 Bud Yerly wrote: >> >> Sorry to hear of your issues. >> >> The failure of the socket indicates the crash may have been more >> severe than anticipated. >> >> In all my years, Ive seen corrosion on older socket parts that were >> not as well protected as the new bits are. I have never seen a >> failure in the 26A as this was a well engineered and tested part by >> Europa. If installed backwards, this can happen. >> >> Please contact Europa Aircraft because the W26 part assembly has not >> been an issue and replacement of the corroded items may be smart. >> This area is a critical flight component and the annual inspection >> and repair may have missed this part may have been damaged or >> assembled incorrectly. If the socket inner W26B failed, was the >> interior tube and attachments properly installed, checked and >> inspected is the question. >> >> Loctite is between the barrel and that thin rectangular piece you >> call it so they operate as a unit. The wing pin goes into the fully >> assembled socket and allows it to move up and down just a bit. If >> not Loctited the barrel can rotate and make pin insertion more >> difficult. (Frankly, during wing install, simply note the >> orientation of the barrel is all that is needed.) Note that the >> assembly thin side goes on the fuselage side. Dont get that >> backwards as it builds up stress and may be a part of the failure you >> see. >> >> As far as the structural strength, the yoke piece 26A and the barrel >> 26C carry the load of the wing pulling forward under max G load. >> This barrel is designed to move up and down. >> >> As for the Rotax 914: >> >> There is a long and boring troubleshooting guide on my website on >> keeping the 914 running true. The carbs are easily rebuilt with >> proper attention to detail. I find the Rotax engine forum >> informational, but doesnt cover in enough detail. I do find the >> videos provided by Rotax to be quite complete. The paper I did >> covers various phases and expands troubleshooting. See the >> techniques section for an updated version since published in the >> Europa Club magazine. >> >> Bud Yerly >> >> www.customflightcreations.com >> >> Sent from Mail for >> Windows 10 >> >> *From: *Erik Dahlbck >> *Sent: *Sunday, September 6, 2020 5:18 PM >> *To: *europa-list@matronics.com >> *Subject: *Europa-List: Rear wing root socket problems >> >> Hello, >> >> First time posting here, hoping my attached photos are small enough, >> etc... >> >> I'm trying to get Europa SE-XRX airworthy again after being grounded for >> two years. At first due to some hard-to-diagnose carburettor problems. >> 914 float bowls, enough said... If interested, I have a post about it >> over at Rotax-Owners: >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rotax-owner.com%2Fen%2F912-914-technical-questions%2F6881-914ul-carburettor-gremlins%3Fstart%3D15&data=02%7C01%7C%7C8482b0ef213641821e7208d852aa5b72%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637350238926500351&sdata=pMvGV5%2BI41Zjnn3nQnSV8Wo37dGxDwnn9%2Ff%2Bu5P7T%2F0%3D&reserved=0 >> >> >> PROBLEM NO 1 >> >> Anyway, after fixing the engine and while doing the annual together with >> the previous owner/builder, it was discovered that the rear wing socket >> housing, part W26B, starboard side, was cracked in two parts. Further >> inspection showed that also the port side was cracked, albeit not having >> split in two just yet. Please see attached photos. >> >> I've got the spares from the manufacturer however, I'm curious if this >> is a known problem? Any thoughts on what could be the cause? Anything >> further to look out for? >> >> My local mechanic seemed just as puzzled as I was when looking at how >> thin this part is. I mean what is it, 2 mm? >> >> One thing to consider: The aircraft was built as a monowheel but crashed >> on takeoff during flight testing, making a hard landing and a ground >> loop. The incident was traced to a construction error in the control >> line attachment to the rudder, causing alterations in the design (some >> of might be familiar with this). The aircraft was then repaired (by some >> sailplane workshop that seemed to know what they were doing, I've seen >> the photos at least). Among other things it got a new tail, a CS prop >> and was rebuilt as a trigear. Might this new discovery simply be residue >> of that old incident? >> >> Also, the builder's manual states that the W26B and C parts should be >> loctited together. However, there was no trace of this. I'm not sure if >> that instruction has been there since the beginning or if it could be a >> later revision? However, I sort of have my doubts as to some loctite >> being able to strenghten this construction enough to not break from >> whatever broke this...? >> >> Finally, any thoughts on how to reassemble these parts? Where does the >> Loctite go? Just on the barrel and make sure the holes align before i >> dries? How to you avoid getting loctite on the surfaces between the >> barrel and the socket body (W26A)? >> >> >> PROBLEM NO 2 >> >> Due to various reasons, I only got around to cleaning the grease off the >> rear socket assemblies, in preparation for reassembly, but doing the >> loctite-work in a cold hangar, etc, and also enlisting the help of the >> very busy local mechanic, was more than I could get done before last >> winter. >> >> Now, on inspection, the W26A socket bodies show signs of corrosion. >> Please see the other attached photos. Anyone have an opinion on just how >> bad this is? Do they also need changing? And does that require >> composite-work? I've been looking through the builder's manual but I'm >> afraid I'm not quite up to understanding all of it. >> >> >> Any thoughts on both of the above issues would be greatly appreciated! >> >> >> Sincerely, >> >> Erik Gunneland Dahlbck >> Linkping, Sweden >> Europa SE-XRX >> > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.