Bruce Collinson Posted December 28, 2021 Share Posted December 28, 2021 Sorry, mine are M6 and I suspect they were replaced from original ‘80s imperial when surgery was required. BTC Quote Link to comment Share on other sites More sharing options...
John Wagg Posted December 28, 2021 Author Share Posted December 28, 2021 22 hours ago, PatMc said: @John Wagg I have a pair of these, screws & mounting brackets complete, doing nothing. They're unused but slightly grubby & the plastic is opaque white rather than translucent as the Ebay ones. If you want to try them PM me your address & I'll stick them in the post. Hi' PatMc, P.M. sent. Thanks John Quote Link to comment Share on other sites More sharing options...
John Wagg Posted December 28, 2021 Author Share Posted December 28, 2021 Hi' All Internet still not returned to normal but is currently operable. ? I have been involved with nuts and bolts thread all my working life but these are possibly imperial, but which ?? In that case I'm unlikely to find a nylon bolt to suit except perhaps old stock. From Leccyflyers Ebay link (thank you) they are/were a "Flair" product and not produced any more. Current available wing bolt/fittings seem to be generally 4mm etc. I prefer plastic bolts as there is at least some give in the event of something getting in the way. I appreciate all the comments and suggestions thank you very much. Regards John Quote Link to comment Share on other sites More sharing options...
John Wagg Posted January 7, 2022 Author Share Posted January 7, 2022 Just an update. I have come to the conclusion that the thread is 1/4" BSF = 1/4" x 26tpi. So very unlikely to find a plastic bolt. Cheers John Quote Link to comment Share on other sites More sharing options...
Geoff S Posted January 7, 2022 Share Posted January 7, 2022 The thread pitch is very close to 6mm x 1.0mm but I guess 6mm is sufficiently less than 1/4" (6.35mm) so will be too loose. You could use steel 1/4" BSF, I guess, or replace the captive nuts. Geoff 1 Quote Link to comment Share on other sites More sharing options...
Zflyer Posted January 8, 2022 Share Posted January 8, 2022 PTFE tape ? Would that help Quote Link to comment Share on other sites More sharing options...
John Wagg Posted January 8, 2022 Author Share Posted January 8, 2022 A 6mm bolt wobbles as I have tried one and could possibly pull out so is not worth the risk. PTFE tape could be an option but I would have to think that through. Chance that the tape, with it being so soft, may not stay in place. As it is PatMc has very kindly sent me a couple of originals so I'm OK for the moment. As a last resort I suppose I could use metal screws. Also now need to source a modern replacement. Thanks all John Quote Link to comment Share on other sites More sharing options...
Eric Robson Posted January 8, 2022 Share Posted January 8, 2022 John, if you can't remove the old retainers you could epoxy some 6mm studding in and use 6mm plastic nuts and washers to retain the wing. Quote Link to comment Share on other sites More sharing options...
John Wagg Posted January 8, 2022 Author Share Posted January 8, 2022 3 minutes ago, Eric Robson said: John, if you can't remove the old retainers you could epoxy some 6mm studding in and use 6mm plastic nuts and washers to retain the wing. Hi' yes thanks. That is an option that had crossed my mind although I would look at fixing some form of nut into the bracket. Possible drill out the 1/4" thread and epoxy in a 4 or 6 mm thread. John Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted January 8, 2022 Share Posted January 8, 2022 John Don't do anything so drastic. I've just checked my wingbolt stocks and I reckon I have a few of those old Flair bolts and fixings -they are not in a package, so I can't be 100% sure, but they look right and trying a 6mm bolt (of which I have dozens) in the fitting that would be a very sloppy, unsuitable fit as you describe. The bolts have 35mm of thread below the cheesehead. If you would like to try these, I'm not likely to use them, so just drop me a PM with your mailing address and I'll pop them in the post FOC, if that would help you out. 1 Quote Link to comment Share on other sites More sharing options...
Eric Robson Posted January 8, 2022 Share Posted January 8, 2022 Let's hope Leccyflyer can solve the problem. A bolt from the top and a nut to hold it would work but would have to be solid as if it started turning in the captive retainer you would not get the wing off easily. Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted January 8, 2022 Share Posted January 8, 2022 If those bolts are not long enough Eric I like that idea of installing a long 6mm bolt, epoxied in place and then maybe using a pair of wing nuts (no pun intended) to retain the wing. I inherited a Wot-4 foam-e from a clubmate's estate, which had the wing retained by a large knob, which screws down onto a bolt protruding from the fuselage and it works very well for a sports model. Quote Link to comment Share on other sites More sharing options...
Jonathan M Posted January 8, 2022 Share Posted January 8, 2022 I'd go for the solution that is most future-proof. Quote Link to comment Share on other sites More sharing options...
John Wagg Posted January 9, 2022 Author Share Posted January 9, 2022 Sorry for the lack of response guys. Contracted Covid and it's knocked me sideways. Up thread hampered by the internet and now the dreaded lurgy. Very sore chest with all the coughing. I'll come back ASAP. Regards John Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted January 10, 2022 Share Posted January 10, 2022 Get well soon, take care...... Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted January 10, 2022 Share Posted January 10, 2022 Good luck John,,, Quote Link to comment Share on other sites More sharing options...
Peter Christy Posted January 10, 2022 Share Posted January 10, 2022 (edited) Have you tried 1/4" UNC? They have approx 1mm pitch, are available from ModelFixings in nylon, and were used on a lot of Vietnamese and older UK kits. When I build a model using wing-bolts for fixing, I use good quality, thick plywood for the mount and simply tap the wood. Running a bit of thin cyano down the threads after tapping, and running the tap through once the cyano has dried, if necessary, will give a very solid fixing, without the need for captive nuts. Been doing it that way for years, thought it was commonplace! Apologies if this has already been suggested! I've only just stumbled on this thread, and its got quite long to search through...! P.S. Get well soon! -- Pete Edited January 10, 2022 by Peter Christy afterthought Quote Link to comment Share on other sites More sharing options...
Nigel R Posted January 10, 2022 Share Posted January 10, 2022 7 minutes ago, Peter Christy said: When I build a model using wing-bolts for fixing, I use good quality, thick plywood for the mount and simply tap the wood. Running a bit of thin cyano down the threads after tapping, and running the tap through once the cyano has dried, if necessary, will give a very solid fixing, without the need for captive nuts. Me also, with a slight variation, I use a ply/balsa/ply sandwich, which gives extra glue area when sticking it to the fuselage side. Quote Link to comment Share on other sites More sharing options...
Geoff S Posted January 10, 2022 Share Posted January 10, 2022 Not the greatest start to 2022 for you, John. Get well soon. Pete, I've always been a bit wary of using wood threads for regular and frequent use (like wing attachment/removal) but perhaps I should try it. By 'thick' plywood I assume you mean 6 mm - or more? I like the threaded inserts sold by Modelfixings and I've used them a lot as they're neater than the more common T nuts. Geoff Quote Link to comment Share on other sites More sharing options...
Peter Christy Posted January 10, 2022 Share Posted January 10, 2022 Hi Geoff, Plywood thickness depends on the model size, clearly, but I've used 1/4" heavy ply on 60 powered 5 footers without any qualms. One of them has been flying for over 10 years now, and the wing fixing is still rock solid (er, unlike some of the rest of the model! ? ) The trick is treating the threads with thin cyano, once you've cut them. If you overdo it, it can clog them up a bit, but another run through with the tap once they've thoroughly dried usually sorts that. I like Nigel's idea of making a ply / balsa sandwich, but I usually fashion my plywood so that it attaches to the bulkhead at the rear of the wing mount as well as the fuselage sides. Attach it with decent epoxy and the fuselage will break before the mount! ? -- Pete Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted January 10, 2022 Share Posted January 10, 2022 Get well soon John - just let me know if those fittings are going to be any use to you. No rush, they're not eating or drinking. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted January 10, 2022 Share Posted January 10, 2022 2 hours ago, Peter Christy said: I usually fashion my plywood so that it attaches to the bulkhead at the rear of the wing mount as well as the fuselage sides. You've got your extra glue area a different way ? Concur on the thin cyano, I dose all the threads everywhere on the airframe, if they're into wood, not just wing bolts... servos, hatches, cowls, canopies, control horns, etc. Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted February 28, 2022 Share Posted February 28, 2022 As this thread has just resurfaced I can confirm that it had a happy ending - those Flair bolts were the right ones and John was able to secure his wings. ? Quote Link to comment Share on other sites More sharing options...
John Wagg Posted March 1, 2022 Author Share Posted March 1, 2022 (edited) Yes a big thankyou to both Patmc and Leccyflyer for the donations of bolts. Both planes now ready for flying but the weather through February has precluded any chance of test flights. Much appreciated for all the help of the forum. Regards John. Edited March 1, 2022 by John Wagg 1 Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted March 1, 2022 Share Posted March 1, 2022 Get well son John. Everything else can wait , health comes first . 1 Quote Link to comment Share on other sites More sharing options...
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