The Murphy Builders Site

Hi Folks, Looking for a bit of input on the application of nut-plates.

I've arrived at a decision point for the mount for the horizontal stabilizer for the Elite (SR/M & Yukon, probably the same configuration but maybe different size) and I'm looking for some info/opinions. Some of the nuts where the stab mount on the fuselage attaches are looking to be a royal pain to get at to fit and get a wrench on to tighten with the stab in place so I'm considering nut-plates for at least those locations.

So, my question is: is there data/knowledge which can justify that they will be as strong as/as good as the nut/washer combo that they would replace? I see axial strength of 4580 lb according to NASM21047/MS21047 (K1000-4 @ACS) but I haven't found any discussion about equivalences & application of nut-plates vs AN365 or similar nuts.

Any thoughts & advice?

Elite builders; is it easier than it looks to work in there and not worth the bother of the nut-plates?

Image of the mounting bracket below, it's an assembly of items 20, 21, 22:

Tks.,

Dave
Elite583

Picture of what I put in the SR/Moose as you CAN NOT get at at least 2 sets once the bottom skin is riveted onto the tail section. I think I sold them all off though, not sure if I have any left but I'll look shortly.

.
Yup, pretty much what I had in mind.

The ones in back of the aft mount.............

Cheers,

Dave
Elite583

Tail hasn’t fallen off yet

Dave, thought they were all gone.. but found another box of these 1/4-28 one lugs. They are anodized yellow with a floating steel lock nut inside. $3 Cdn each + postage if you want some.

irishfield wrote: ↑

Mon May 07, 2018 7:18 am

Dave, thought they were all gone.. but found another box of these 1/4-28 one lugs. They are anodized yellow with a floating steel lock nut inside. $3 Cdn each + postage if you want some.

Thanks Wayne, I'll pop you an E-mail with details.

Cheers,

Dave
Elite 583