Wingtip fasteners
Posted: Fri Feb 09, 2024 11:12 pm
by DWest
Clearly the plans call for rivets. Has anyone used u-nuts and a 6-32 screw to fasten the wingtips or something other than rivets?
Seems like a great way to allow for inspection and allow better access to the wing..
Thoughts?
Re: Wingtip fasteners
Posted: Fri Feb 09, 2024 11:21 pm
by BobDz
Not there yet. But I’ve been thinking along the same lines. Especially if I install position lights.
Re: Wingtip fasteners
Posted: Fri Feb 09, 2024 11:29 pm
by BRS
On my Sonex-A rebuild, the Aveo LED’s wiring needed attention. In order to do so I had to drill several rivets. Now I’d like to 3D print a mount for them so they aren’t at an angle. But then I’d have to drill those rivets again. I say find some way to use another option. Removeable wingtips would be great. Keep in mind though to maintain structural integrity.
Re: Wingtip fasteners
Posted: Sat Feb 10, 2024 8:01 am
by Area 51%
It’s my understanding the Xenox wingtips are quickly interchangeable. How do they attach?.
Re: Wingtip fasteners
Posted: Sat Feb 10, 2024 9:24 am
by XenosN42
Area 51% wrote:It’s my understanding the Xenos wingtips are quickly interchangeable. How do they attach?.
Piano hinges.
Re: Wingtip fasteners
Posted: Sat Feb 10, 2024 10:35 am
by Scott Todd
You could use regular nut plates. On my Onex, I was thinking I might want to change the tips to short ones someday. After weighing all the odds. I used aluminum rivets. I figure I could drill them out in about the time it tales to install one nut plate if I ever go this route. My wing was painted white and I found some rivets already painted white. The red tips were added after everything was painted. Can’t tell the difference 
Re: Wingtip fasteners
Posted: Sat Feb 10, 2024 12:08 pm
by Bryan Cotton
I also used aluminum pops for the wingtips on my Waiex A model. Very easy to drill out if required. It’s been required once.
Re: Wingtip fasteners
Posted: Sat Feb 10, 2024 12:46 pm
by BobDz
Bryan Cotton wrote:I also used aluminum pops for the wingtips on my Waiex A model. Very easy to drill out if required. It’s been required once.
Seems to be the easiest, cheapest, lightest solution.
Re: Wingtip fasteners
Posted: Sat Feb 10, 2024 2:58 pm
by N265DF
Sonex Tech told me okay to use aluminum rivetes for wingtips but, ironically for tail tips stainless steel rivets required.
Darrell Frey
N265DF
Think getting close to flying, but I recall saying that to my lovely Spouse 10 years ago on her 80th birthday.
Re: Wingtip fasteners
Posted: Sat Feb 10, 2024 4:51 pm
by DWest
I can’t see how nut plates would work in fiberglass. Sonex told me the same about the tail tips, factory only so I did and had only one slightly crack the fiberglass. That was because it was too tight in that area to begin with.
Guess the aluminum rivets will be the solution for me too. Got a part number?
Re: Wingtip fasteners
Posted: Sat Feb 10, 2024 5:57 pm
by Bryan Cotton
DWest wrote:I can’t see how nut plates would work in fiberglass. Sonex told me the same about the tail tips, factory only so I did and had only one slightly crack the fiberglass. That was because it was too tight in that area to begin with.
Guess the aluminum rivets will be the solution for me too. Got a part number?
Nutplates work fine in fiberglass. My tail tips have nutplates.
I used aluminum 1/8" avex rivets.
https://www.aircraftspruce.com/catalog/ … kkey=11312
Re: Wingtip fasteners
Posted: Mon Feb 12, 2024 10:58 am
by Scott Todd
I have put nut plates in fiberglass plenty of places. I usually soak the edges with thin CA before riveting but its probably overkill. I don’t think it really penetrates properly cured fiberglass, but it gives me a warm feeling 
Re: Wingtip fasteners
Posted: Mon Feb 12, 2024 6:20 pm
by DCASonex
The aluminum rivets I used when riveting into fiberglass are the from a Zenith kit and I think were listed as Avtech A4 (1/8") rivets. The Avex rivets look like they may be similar. They are identified by a small groove around the stem that creates a weak area where bulging first starts, then the bulge is pulled down onto the fiberglass clamping it to the aluminum. If you pull a standard Sonex rivet into fiberglass it bulges outward inside the fiberglass and tends to breakout if near the edge. Try this with some scrap material. The Sonex SS rivets are much better when fastening two pieces of aluminum together as the expansion eliminates and lateral movement between the parts. Zenith uses (or used to use) Avtech or an equivalent rivet and I made a test Tee square with just a couple of rivets at the joint, this movement is very evident with these rivets. I also used the aluminum Zenith type rivets rivets when fastening aluminum piano hinges to fiberglass even though the head of the rivet is on the fiberglass the SS rivets tend to distort the piano hinges in this application. Just be sure your aluminum rivets have the groove and that they first form a bulge when pulled and then pull that bulge back onto the materiel clamping it, test on some scrap if in doubt.
12 years in service so far, no sign of any problems with those rivets.
David A.
Re: Wingtip fasteners
Posted: Mon Feb 12, 2024 10:36 pm
by lakespookie
Funny this post came up I have literally been contemplating the same with my wingtips, I put all the electrical connections in the landing light location so a quick disconnect is available if I needed it without removing the wing tips, but the more i think about it the more i want to mount them with nutplates and screws for easier access to both the wiring behind the lights and the landing/taxi light,
That being said my light mounts have nut plates works fine in fiberglass so no concern there keep your edge spacing reasonable and you will be ok. also you have some access to the cabling if you remove the aileron as there is an inspection hole in the last bay so technically riveting is still an option if you did the wiring like i did. as the conduit will get it to the back bay and you can use a long gripper to snake the cables if you really needed to replace that set of cables.
Details in my build log if anyone is interested in my wiring.
Re: Wingtip fasteners
Posted: Tue Feb 27, 2024 12:38 am
by DWest
Thanks all. I’m going to go with the aluminum rivets from aircraft spruce. Not even close to starting the fuselage yet and im getting excited to have this thing flying. I figure I can do mods later on. Unless it’s something that is really going to make life and maintenance easier.
Should I use the.187 grip rivets?
Re: Wingtip fasteners
Posted: Sat Aug 17, 2024 5:54 pm
by Eric W
I used Al rivets from the local hardware store. I also had run a plastic tube inside the wing ribs from root to tip for future wingtip lighting, but I never installed any lights.
Figured that if I ever did, Al rivets would be a lot easier to remove, and they’re at the tip of the wing where there’s not much load anyway.
Re: Wingtip fasteners
Posted: Sat Aug 17, 2024 11:02 pm
by onex28
On my Onex everything forward of the panel is platenutted, wanted easy access to the fuel tank if needed.