Tony j Posted April 22, 2019 Share Posted April 22, 2019 Good morning All I have a canopy that is located with two peg at the front and then two M3 screws screw into the sides . Now I was flying the other day and returned with one screw missing. So is there away that I can stop them from coming loose in flight. I thought about thread loc but thought this may not suit as they need to go in and out on a regular basis so any suggestions please . Many thanks in advance. Kind regards. Tony J Quote Link to comment Share on other sites More sharing options...
Former Member Posted April 22, 2019 Share Posted April 22, 2019 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted April 22, 2019 Share Posted April 22, 2019 Use stiff nuts inside Quote Link to comment Share on other sites More sharing options...
Former Member Posted April 22, 2019 Share Posted April 22, 2019 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Former Member Posted April 22, 2019 Share Posted April 22, 2019 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
trebor Posted April 22, 2019 Share Posted April 22, 2019 I gave up using locktite as even the kindest stuff used to strip fine Chinese threads made of China's best metal, instead I use Uho por which is very sticky and shake ressistant. Even the other half's old nail varnish comes in handy and it looks good too Quote Link to comment Share on other sites More sharing options...
Manish Chandrayan Posted April 22, 2019 Share Posted April 22, 2019 I am assuming that canopy needs to be removed frequently, either to change the batteries or access equipment inside. I am also assuming that the original screws that were on the model and one of which bailed out was metal M3. This is a common occurrence and Locktite, nail varnish etc do not work in this situation. My way of avoiding the screws bailing out is to use nylon screws instead of the provided metal ones. Once snugged in they remain snug. Other option is to remove the existing blind nut and epoxy a nyloc nut. This will allow you to use metal screws but the torque required to loosen or tighten the screw may dislodge the nyloc nut Quote Link to comment Share on other sites More sharing options...
kc Posted April 22, 2019 Share Posted April 22, 2019 Any sort of rubbery adhesive works well to lock screws. I used Evostik impact or Thixofix to hold silencer screws in - never came loose until needed to unscrew. Of course shakeproof washers as found on lots of electrical items ( dozens in an old washing machine ) could be used in this instance if they are small enough sizes. Quote Link to comment Share on other sites More sharing options...
Ronaldo Posted April 22, 2019 Share Posted April 22, 2019 I solder steel nyloc nuts onto captive 'T' nuts. Sounds impossible I know, but it does work if you can set the soldering iron temperature just hot enough to melt the solder and not the nyloc insert. I've used this method for all kind of fixings where vibration is an issue. Quote Link to comment Share on other sites More sharing options...
Former Member Posted April 22, 2019 Share Posted April 22, 2019 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Nigel Dell Posted April 22, 2019 Share Posted April 22, 2019 I found that just changing the metal bolts to nylon stopped this, if they are suitable for purpose that is, It was just to hold a canopy section access hatch on the fuz in my case, the Seagull models iSport has the exact same set up. Quote Link to comment Share on other sites More sharing options...
Capt Kremen Posted April 22, 2019 Share Posted April 22, 2019 Where the screw hole already exists and the screw is loose, take a small piece of 'soft wood' e.g. match stick. Break off enough to insert as filler in the hole, using a spot of glue to stop it coming out. Re-insert the screw. The screw will then cut a new tighter thread fit. (This is a common remedy for musical instrument loose screw strap buttons which are subject to constant wear and tear). Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted April 22, 2019 Share Posted April 22, 2019 I try to replace screw retention on hatches with a spring latch, either a single central latch or one each side mounted in the fuselage side mounted so that the sprung pin locates into a notch in the edge of the hatch tab. As I'm all electric now I want quick access to the battery so screwed on hatches are out. Quote Link to comment Share on other sites More sharing options...
Peter Jenkins Posted April 23, 2019 Share Posted April 23, 2019 I slip a bit of fuel tubing over the bolt but with a washer between the bolt head and fuel tubing. When tightened, the fuel tubing provides sufficient pressure to stop the bolt loosening and falling out. I've used this to retain the canopy on a Capiche 140 with what has to be the roughest 4 stroke 180 made - Saito! The bolts stayed tight all day. Cheap and very effective. Quote Link to comment Share on other sites More sharing options...
Tony j Posted April 23, 2019 Author Share Posted April 23, 2019 Hi Thank you all for your replies lots of interesting ways of dealing with the issue , its good to know that I am not alone with the problem. Kind regards Tony J Quote Link to comment Share on other sites More sharing options...
Jon Laughton Posted April 23, 2019 Share Posted April 23, 2019 A small collar of silicone fuel tubing between the head of the M3 bolt and the fuselage side may do the trick - just tighten it up well before flying. Alternatively fir the both toa Seacraft cup washer and a spring washer for the same kind of effect Quote Link to comment Share on other sites More sharing options...
FlyinBrian Posted April 24, 2019 Share Posted April 24, 2019 Small "O" rings on the M3 bolts or as abve slivers of silicon fuel tube. Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted April 24, 2019 Share Posted April 24, 2019 try a rubber washer under the bolt head..... ken anderson...ne...1...rubber washer dept. Quote Link to comment Share on other sites More sharing options...
Cuban8 Posted April 24, 2019 Share Posted April 24, 2019 A cut down servo grommet works well, the round type rather than rectangular Futaba ones. Full grommets hold cowls in place without losing screws as well. Quote Link to comment Share on other sites More sharing options...
Bruce Collinson Posted April 24, 2019 Share Posted April 24, 2019 Modelfixings sell small O-ring grommets, included in their socket-head servo screw packs (which I endorse unreservedly, five get used for every one that secures a servo) and are great for cowls and canopies upto say 10cc in old money. I'm sure they're sold seperately, although much better value in the assortment pack. BTC Quote Link to comment Share on other sites More sharing options...
Steve Balaam Posted April 24, 2019 Share Posted April 24, 2019 I used to have this problem until I changed to plastic screws similar material to wing retention bolts . The plastic screw thread expands a little as you screw it in and provides a solid hold, never had a problem since. Steve B Quote Link to comment Share on other sites More sharing options...
Mike T Posted April 25, 2019 Share Posted April 25, 2019 It's an obvious question (so obvious in fact that nobody has yet thought to ask it), but what material are you trying to fix into? I think I'd need to know that before offering any advice on stopping a screw from working out of it... Quote Link to comment Share on other sites More sharing options...
Tony j Posted April 25, 2019 Author Share Posted April 25, 2019 Hello Mike thank you for your reply I am using metal screws through a wooden side screwing into a steel captive nut Kind Regards Tony J Quote Link to comment Share on other sites More sharing options...
SR 71 Posted April 25, 2019 Share Posted April 25, 2019 Is that a screw or a bolt ? If it's into a captive but i would say bolt I always cut 3mm off the end of a piece of full tube put it over the bolt When it's tight the tube squashes up and stops the bolt turning Tony Quote Link to comment Share on other sites More sharing options...
Nigel R Posted April 26, 2019 Share Posted April 26, 2019 Any threaded fastener into a nut, is a bolt, whereas, any threaded fastener into a threaded piece of material, is a screw, I believe. And thus a hair is split. Quote Link to comment Share on other sites More sharing options...
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