You can use nylocks, but you need to flox them to the back of the spar. It is a lot easier to flox on a nut plate than it is with just a nut. I used the MF5000-3 http://www.aircraftspruce.com/catalog/hapages/anchornuts.php nuts from Aircraft spruce. They are self locking and plenty strong. I would have loved to use something like a T nut, but I don't know of any that are aircraft quality.
I drilled through the hinges and the spar with a drill bit that was undersized enough so I could tap the screws right into the wood and keep everything aligned while I did all the holes. After the holes were all drilled I used a larger bit to drill the spar holes the correct clearance size. I used short screws with some washers under the heads to just catch the first few threads of the nutplates (So I wouldn't hit the deformed self locking portion of the nutplate and loosen them up when the temporary screws were taken out. You can reuse nylon lock nuts a few times, but all metal lock nuts are only supposed to be used once.) and used thick flox being carefull not to get any in the threads. I also countersunk the hinge and used flat head screws. The hinges I took off had pan head screws with a hole drilled in the opposite half of the hinge to clear the screw heads. If you countersink the hinges make sure that the screw head is not sunk completely into the hinge material. I left mine sticking out about .020". That left more meat on the hinge for the screw to hold down and still gave me full down travel on the ailerons without the screw heads hitting. I originally had three hinge pieces about a foot long each. I replaced them with a continuous hinge per the plans. Some people say to use one long hinge. Some say to use separate pieces so if the wing flexes and bends the hinge it won't bind. I am copying this to the list so that other people can disagree with any of my methods. Aileron hinge attachment is enough of a safety issue that you should have more than one opinion. -------Original Message------- From: Timothy Bellville <soner...@worldnet.att.net> Sent: 07/09/03 08:32 PM To: Brian Kraut <eng...@earthlink.net> Subject: Re: Re: KR>KR2 Ailerons > > Well ,just my luck, he did pop rivet the hinges to the WOOD spar, It was meant to be a temporary installation for alignment then install the nuts later. Do I have to use nut plates or can I use nylocks? Thanks Tim ----- Original Message ----- From: "Brian Kraut" <eng...@earthlink.net> To: "KR builders and pilots" <kr...@mylist.net> Cc: <soner...@worldnet.att.net> Sent: Wednesday, July 09, 2003 3:03 PM Subject: Re: Re: KR>KR2 Ailerons > I had to tear into mine recently to add some nut plates. I used a small cutting wheel on the dremel to cut out about a 1.5" X 1" rectangle just forward of the spar. You can dig out the foam and see what you have and flox in new nut plates if you need to. Repairs are fairly easy. Just stuff in a chunk of foam, sand down to the glass a couple of inches around the hole, and put on two plies of glass. I didn't even need any filler, just five or six coats of smooth prime and some sanding. > > -------Original Message------- > From: Timothy Bellville <soner...@worldnet.att.net> > Sent: 07/08/03 10:18 PM > To: KR builders and pilots <kr...@mylist.net> > Subject: Re: KR>KR2 Ailerons > > > > > Thanks Rick, > looks like I'm tearing in to these wings! > I don't know what is under the glass, I hope he didn't put them in to the > wood spar. > I was actually hoping he glassed over some alum. > I have a call in to him for some answers. > Thanks again. > Tim > ----- Original Message ----- > From: "Rick Wilson" <rwdw2...@yahoo.com> > To: "KR builders and pilots" <kr...@mylist.net> > Sent: Tuesday, July 08, 2003 7:01 AM > Subject: Re: KR>KR2 Ailerons > > > > Tim, The plans call for nuts to be floxed to the back > > side of the spar and then screws put through the spar > > and screwed into the nuts. Same on the aileron spar. > > Hope this helps. Rick Wilson. > > --- Timothy Bellville <soner...@worldnet.att.net> > > wrote: > > > Help Guys, > > > I made a horrible discovery today, and I need some > > > help. On doing an inspection of the wing outer > > > panels, I discovered that the original builder had > > > used SS rivets to mount the piano hinges to the > > > spars, and one came loose! > > > > > > I scanned the plans but could not find anything > > > about the installation of the aileron, just the > > > control horn . > > > What kind of fastener should be used? and how many? > > > Could someone please go in to detail about this most > > > critical assembly. > > > I have spent a great deal of time finishing this > > > little bird, and hopefully this is no big deal. > > > At this point, I thought The wings were complete, > > > ready for paint. > > > Thanks > > > Tim Bellville > > > KR2 > > > N7038V > > > Toledo ,Ohio > > > _______________________________________________ > > > see KRnet list details at > > http://www.krnet.org/instructions.html > > > > > > ===== > > Rick Wilson, Haleyville, Alabama KR2-0200A -99% rwdw2...@yahoo.com > > > > > > > > __________________________________ > > Do you Yahoo!? > > SBC Yahoo! DSL - Now only $29.95 per month! > > http://sbc.yahoo.com > > > > _______________________________________________ > > see KRnet list details at http://www.krnet.org/instructions.html > > > _______________________________________________ > see KRnet list details at http://www.krnet.org/instructions.html > > > >
