Screws vibrating out
#1
Moderator
Thread Starter
Screws vibrating out
I have reatored an old Wildhare Sukhoi and flown it a few times. The canopy is held on by 4 screws that go through the fuselage into a blind nut in the canopy. I can't really tighten those screws as it would crush the balsa structure. Two vibrated loose and fell out last time I flew it. So does anyone have a solution? I can't Loctite them because I have to remove the canopy for assembly. Maybe Vibratite? Maybe a neoprene washer? Something else?
#8
Moderator
Thread Starter
I didn't even think of using nylon bolts. There is very little stress on these, so they would be plenty strong. I'll try that before going to the neoprene washers.
#10
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Bonded washers are very good for these types of applications. A bonded washer is a steel/metal washer, with a rubber washer bonded to it which creates a cushion/bed. There's different types and sizes of course, but you get the idea. Essentially they might be like putting an o-ring behind a washer... but much better.
I use those quite a bit for canopies and cowlings, and anywhere vibration might be present... as well as areas that might be a bit softer.in one way or another.
McMaster Carr has a good supply of them... in different sizes that fit most every size screw on planes from small to giants.
I use those quite a bit for canopies and cowlings, and anywhere vibration might be present... as well as areas that might be a bit softer.in one way or another.
McMaster Carr has a good supply of them... in different sizes that fit most every size screw on planes from small to giants.
#13
Another quick and easy solution is to cut a piece of fuel tube about 1/8" long and slide it up to the screw head. Compress it about half way and it will provide enough friction to keep the screw from vibrating out without cracking the canopy.
Scott
Scott