Fuel Tank Nutplates

[Jims170A]

There are special Nut Plates used in fuel tanks. They have a dome on the back
side to cover where the bolt comes through and a Oring on the flat side to
seal it. I would still cover it with Proseal just to be sure it did not leak.
You have to be careful not to use a bolt to long as it will break through
the dome. I don't know a Part Number or a Source to get these but I did see
a bag of 100 get sold on ebay really cheap.
Jim



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[Wayne G. O'Shea]

Jim, I have these anchor nuts also, but won't use for an important
structural item like retaining an aileron! They are called "float nuts" and
were originally designed for use on aircraft float access panels. They have
an o-ring to seal them when riveted to the panel and keep the water out of
the floats (but of course it collects in the nutplate and rusts the
screw/bolt in place!). I use these when installing fuel tank senders in the
root rib, but don't have enough confidence in their structural properties
for holding the aileron/flap brackets in place. They are also a floating nut
which may add to the possibility of cross threading when trying to install
the brackets and shims, and the flaps/ailerons are definitely not an item I
want to take a chance on losing due to bad threads.

Regards,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: <Jims170A@cs.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, December 03, 2001 9:58 PM
Subject: Fuel Tank Nutplates

There are special Nut Plates used in fuel tanks. They have a dome on the

back

side to cover where the bolt comes through and a Oring on the flat side to
seal it. I would still cover it with Proseal just to be sure it did not

leak.

You have to be careful not to use a bolt to long as it will break through
the dome. I don't know a Part Number or a Source to get these but I did

see

a bag of 100 get sold on ebay really cheap.
Jim

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[Wayne G. O'Shea]

One other thing to add to my reasons not to use the "float nut" for the
aileron hinge: They will not work for the aileron hinge brackets as the
"float nuts" are riveted on each side of the nut (like a standard anchor
nut), which isn't possible in this location (without cutting holes in the
rib flange anyhow, which you sure don't want to do!). You need a "one lug"
anchor to get the nut down/up to the edge of the spar, where the hinge bolts
on.

Wayne

----- Original Message -----
From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
To: <murphy-rebel@dcsol.com>
Sent: Monday, December 03, 2001 10:10 PM
Subject: Re: Fuel Tank Nutplates

Jim, I have these anchor nuts also, but won't use for an important
structural item like retaining an aileron! They are called "float nuts"

and

were originally designed for use on aircraft float access panels. They

have

an o-ring to seal them when riveted to the panel and keep the water out of
the floats (but of course it collects in the nutplate and rusts the
screw/bolt in place!). I use these when installing fuel tank senders in

the

root rib, but don't have enough confidence in their structural properties
for holding the aileron/flap brackets in place. They are also a floating

nut

which may add to the possibility of cross threading when trying to install
the brackets and shims, and the flaps/ailerons are definitely not an item

I

want to take a chance on losing due to bad threads.

Regards,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: <Jims170A@cs.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, December 03, 2001 9:58 PM
Subject: Fuel Tank Nutplates

There are special Nut Plates used in fuel tanks. They have a dome on the

back

side to cover where the bolt comes through and a Oring on the flat side

to

seal it. I would still cover it with Proseal just to be sure it did not

leak.

You have to be careful not to use a bolt to long as it will break

through

the dome. I don't know a Part Number or a Source to get these but I did

see

a bag of 100 get sold on ebay really cheap.
Jim

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