The Murphy Builders Site

Folks,

It's time to put a shoulder-type eyebolt on my wing struts for tiedown purposes. I ordered a set of the "wing strut tie down rings" from MAM; $42 USD later they arrived. They are 5/16" diameter, 20 thread/inch, 4" long, with only a 3/8" eye--not a big enough eye to get two loops of rope through.

After poking around on marine hardware sites on the web, it would appear that this size's working load limit is 900 lbs on a straight pull. Overall, the price seems STEEP compared to somewhat comparable ones I found on various hardware sites (e.g. $5 to $12 each on the web--though I did not find an exact match).

- What are other folks doing for strut tiedown attach points?

- Has anyone else used the MAM eyebolt? Opinion?

- Is a 900 working load limit (straight pull) really strong enough for the Moose?

Thank you,

Ted
142SR




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I don't have an answer, as I havn't started building yet, but I would say
you can probably find better hardware options for less money, for many
situations like this. Regarding aircraft quality hardware: you can buy
better quality, but you can't put it on an aircraft. That's why homebuilts
are so cool; you can use better quality stuff, and get it cheaper usually
too.
I have a question though, which was the real reason I replied to this. Has
anyone put tie-down rings closer to the wing tips, for float plane use, like
Beavers have? They sure are nice for moving the plane around at the dock.
Maybe not necessary on a Rebel though, since the wing is probably low enough
to grab directly, without a rope.
Thanks.
Jesse

From: "Ted Waltman" <tedwaltman@i1ci.com>
Reply-To: <rebel-builders@dcsol.com>
To: rebel-builders@dcsol.com
Subject: Wing tie-down eye bolt
Date: Fri, 11 Jun 2004 08:17:23 -0600

Folks,

It's time to put a shoulder-type eyebolt on my wing struts for tiedown
purposes. I ordered a set of the "wing strut tie down rings" from MAM; $42
USD later they arrived. They are 5/16" diameter, 20 thread/inch, 4" long,
with only a 3/8" eye--not a big enough eye to get two loops of rope
through.

After poking around on marine hardware sites on the web, it would appear
that this size's working load limit is 900 lbs on a straight pull.
Overall, the price seems STEEP compared to somewhat comparable ones I found
on various hardware sites (e.g. $5 to $12 each on the web--though I did not
find an exact match).

- What are other folks doing for strut tiedown attach points?

- Has anyone else used the MAM eyebolt? Opinion?

- Is a 900 working load limit (straight pull) really strong enough for the
Moose?

Thank you,

Ted
142SR




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Ted,

I used MAM's SS tie down bolts on my Rebel and they have worked fine. The
Moose I would imagine they would be OK even though it is a larger plane. I have
no knowledge of the engineering of the bolt but it would appear on the service
to be sufficient, to me.

Bruce




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Not sure what thread size the Moose takes, but the RV guys use these from
Van's. They are 3/8-16 and only $3.50 USD

http://www.vansaircraft.com/cgi-bin/cat ... -213&brows
e=airframe&product=tiedown-ring

-Mike Kraus
N223RV RV-4 Flying
N213RV RV-10 Empennage complete, working on Tailcone, thinking about a
Moose....




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I have eye bolts in the spar just inboard of the wing tips. I don't have
ropes there and caution using them. I have seen on several occasions of good
Samaritans grabbing the wing line and pulling the airplane into the dock
with the float taking the hit. It always leaves a dent in the float. If your
going into docks that have several airplanes on them and dock attendants
know what there doing they will grab the wing tip line and walk you forward.
Again caution, if you don't know the person on the dock yell leave me alone.
I find it better to go around than trying to save a bad docking.
Al
Moose, N526AP
----- Original Message -----
From: "Jesse Jenks" <jessejenks@hotmail.com>
To: <rebel-builders@dcsol.com>
Sent: Friday, June 11, 2004 11:02 AM
Subject: RE: Wing tie-down eye bolt

I don't have an answer, as I havn't started building yet, but I would say
you can probably find better hardware options for less money, for many
situations like this. Regarding aircraft quality hardware: you can buy
better quality, but you can't put it on an aircraft. That's why homebuilts
are so cool; you can use better quality stuff, and get it cheaper usually
too.
I have a question though, which was the real reason I replied to this. Has
anyone put tie-down rings closer to the wing tips, for float plane use,

like

Beavers have? They sure are nice for moving the plane around at the dock.
Maybe not necessary on a Rebel though, since the wing is probably low

enough

to grab directly, without a rope.
Thanks.
Jesse

From: "Ted Waltman" <tedwaltman@i1ci.com>
Reply-To: <rebel-builders@dcsol.com>
To: rebel-builders@dcsol.com
Subject: Wing tie-down eye bolt
Date: Fri, 11 Jun 2004 08:17:23 -0600

Folks,

It's time to put a shoulder-type eyebolt on my wing struts for tiedown
purposes. I ordered a set of the "wing strut tie down rings" from MAM;

$42

USD later they arrived. They are 5/16" diameter, 20 thread/inch, 4"

long,

with only a 3/8" eye--not a big enough eye to get two loops of rope
through.

After poking around on marine hardware sites on the web, it would appear
that this size's working load limit is 900 lbs on a straight pull.
Overall, the price seems STEEP compared to somewhat comparable ones I

found

on various hardware sites (e.g. $5 to $12 each on the web--though I did

not

find an exact match).

- What are other folks doing for strut tiedown attach points?

- Has anyone else used the MAM eyebolt? Opinion?

- Is a 900 working load limit (straight pull) really strong enough for

the

Moose?

Thank you,

Ted
142SR




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The ones that I got from MAM a few years ago are welded stainless with a
0.6" hole. Probably a marine part. I could not find a stronger forged
unit that I liked. MAM's part seemed more suitable after I looked up the
strengths of some common half inch ropes.
Ken
119R

From: "Ted Waltman" <tedwaltman@i1ci.com>
Reply-To: <rebel-builders@dcsol.com>
To: rebel-builders@dcsol.com
Subject: Wing tie-down eye bolt
Date: Fri, 11 Jun 2004 08:17:23 -0600

Folks,

It's time to put a shoulder-type eyebolt on my wing struts for tiedown
purposes. I ordered a set of the "wing strut tie down rings" from MAM;

$42

USD later they arrived. They are 5/16" diameter, 20 thread/inch, 4"

long,

with only a 3/8" eye--not a big enough eye to get two loops of rope
through.

After poking around on marine hardware sites on the web, it would appear
that this size's working load limit is 900 lbs on a straight pull.
Overall, the price seems STEEP compared to somewhat comparable ones I

found

on various hardware sites (e.g. $5 to $12 each on the web--though I did

not

find an exact match).

- What are other folks doing for strut tiedown attach points?

- Has anyone else used the MAM eyebolt? Opinion?

- Is a 900 working load limit (straight pull) really strong enough for

the

Moose?

Thank you,

Ted
142SR

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Ted, I have used numerous ways to make tie downs, but the best I have is a
bolt and a female threaded "D" ring. The "tear drop" shape of these is also
long enough that it will stick out through the upper strut fairing far
enough to get the rope in. Unfortunately I bought a 1/2 dozen of these in
1995 (used them all) and can't find the part # to reorder. If I recall the D
rings where about $12 Cdn each. I'm sure searching thru Spaenaur's stuff or
similar hardware sites will bring them up.

www.spaenaur.com

Heck..took the time to look for them as I typed this
http://www.spaenaur.com/view_pdf.asp?Page=B320
"Drop forged eye nuts" is what they are really called. 5/16" pt #024-851 and
3/8" pt#024-852. Not sure what size bolts go through the Moose lift strut
fitting blocks as have never looked.

The same link page has "shouldered forged eye bolts" that would work good as
well, but don't give as much room for a double rope loop.

Cheers,
Wayne

----- Original Message -----
From: "Ted Waltman" <tedwaltman@i1ci.com>
To: <rebel-builders@dcsol.com>
Sent: Friday, June 11, 2004 10:17 AM
Subject: Wing tie-down eye bolt

Folks,

It's time to put a shoulder-type eyebolt on my wing struts for tiedown

purposes. I ordered a set of the "wing strut tie down rings" from MAM; $42
USD later they arrived. They are 5/16" diameter, 20 thread/inch, 4" long,
with only a 3/8" eye--not a big enough eye to get two loops of rope through.

After poking around on marine hardware sites on the web, it would appear

that this size's working load limit is 900 lbs on a straight pull. Overall,
the price seems STEEP compared to somewhat comparable ones I found on
various hardware sites (e.g. $5 to $12 each on the web--though I did not
find an exact match).

- What are other folks doing for strut tiedown attach points?

- Has anyone else used the MAM eyebolt? Opinion?

- Is a 900 working load limit (straight pull) really strong enough for the

Moose?

Thank you,

Ted
142SR




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