Rubber expansion nuts.
#1
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Join Date: Aug 2002
Location: State College,
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Rubber expansion nuts.
In order to accomodate a 4 stroke engine in the future, I built my GP 40 Cub with the firewall about 3/4" aft of what the plans call for. Currently using a 45/2stroke.
I used rubber expansion nuts, sometimes called Lord Mounts, to attach a "sub firewall" and attached the engine mount to that.
I could have used blind nuts, but I thought these might take out some "buzzyness".
See quick and dirty drawing
My question is has anyone had any failures with these rubber plugs.
I used rubber expansion nuts, sometimes called Lord Mounts, to attach a "sub firewall" and attached the engine mount to that.
I could have used blind nuts, but I thought these might take out some "buzzyness".
See quick and dirty drawing
My question is has anyone had any failures with these rubber plugs.
#3
Join Date: Feb 2002
Location: Houston, TX
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Rubber expansion nuts.
Tom,
I use them on my mid-sized gassers (up to 42cc). I have not had a failure in flight. I have lost the ability to reingauge the brass nut requiring replacement, and I have had the bolt vibrate loose. Otherwise they are fine and I continue to use them ... checking bolt torqure regularly.
Bedford
I use them on my mid-sized gassers (up to 42cc). I have not had a failure in flight. I have lost the ability to reingauge the brass nut requiring replacement, and I have had the bolt vibrate loose. Otherwise they are fine and I continue to use them ... checking bolt torqure regularly.
Bedford
#4
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Rubber expansion nuts.
I believe what you are referring to is normally called a "Well Nut". A "Lord Mount" is a completely different animal. I had a 1.20 mounted with 10-32 Well Nuts. They deteriorated very quickly and would not stay tight. When I removed them, the rubber was in very bad shape. I don't use them anymore.
#5
Join Date: Feb 2002
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Rubber expansion nuts.
ilikepllanes,
You are right, I am referring to Well Nuts. In my case, I am running gassers, that may be why mine are not deteriorating while yours are.
Bedford
You are right, I am referring to Well Nuts. In my case, I am running gassers, that may be why mine are not deteriorating while yours are.
Bedford