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Seafins - Stab Mods

https://www.murphybuilders.net/viewtopic.php?f=1&t=3925

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Seafins - Stab Mods

Posted: Sat Feb 18, 2012 9:09 am
by Warren Montgomery
Just starting 3500 stab mods and need to clarify a couple of things.
(even after reading the archives)

The Seafins as per MAMs demo appear to start aft of the stab main spar
on main rib.
Is this the correct position?

I would like to add some blind nuts for a future seafin on main stab rib
How many per seafin and size?
Do they need to be flush or is there enough clearance for round head bolts?

ST403 doubler, there was discussion of increasing these to the full
length of 9'10"
Is this necessary?

Outer stab rib corner wrap.
Again is this a one off mod or should it be included?
I thought maybe doing as Mike D did on the inside but extending forward
to also act as a rib doubler for the seafin, thoughts?

Warren
Moose 029
Dubai, UAE




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Seafins - Stab Mods

Posted: Sat Feb 18, 2012 9:12 am
by Al Paxhia
Warren,
They do start aft of the spar, I riveted mine since it was done after the
fact, nut plates are a better solution. There is just enough clearance for
the fins so you will need flush fasteners. I would see it MAM has new
heavy end rib if not I would add a doubler, I used three rows of 1/8 rivets
on 1.5 pitch (no doubler).
Al

----- Original Message -----
From: "Warren Montgomery" <monty@emirates.net.ae>
To: <murphy-rebel@dcsol.com>
Sent: Friday, April 16, 2004 10:21 AM
Subject: Seafins - Stab Mods

Just starting 3500 stab mods and need to clarify a couple of things.
(even after reading the archives)

The Seafins as per MAMs demo appear to start aft of the stab main spar
on main rib.
Is this the correct position?

I would like to add some blind nuts for a future seafin on main stab rib
How many per seafin and size?
Do they need to be flush or is there enough clearance for round head
bolts?
ST403 doubler, there was discussion of increasing these to the full
length of 9'10"
Is this necessary?

Outer stab rib corner wrap.
Again is this a one off mod or should it be included?
I thought maybe doing as Mike D did on the inside but extending forward
to also act as a rib doubler for the seafin, thoughts?

Warren
Moose 029
Dubai, UAE




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Seafins - Stab Mods

Posted: Sat Feb 18, 2012 9:12 am
by Al Paxhia
Hi Don,
I will measure to be sure and let you know but I think .063.
Al
----- Original Message -----
From: "Don Boardman" <dboardm3@twcny.rr.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, April 19, 2004 10:30 AM
Subject: Re: Seafins - Stab Mods

Hi Al,

We are getting close!
What thickness did you use for your Seafins?

Don B.
From: Al Paxhia <paxhia2@comcast.net>
Reply-To: murphy-rebel@dcsol.com
Date: Mon, 19 Apr 2004 10:07:52 -0700
To: murphy-rebel@dcsol.com
Subject: Re: Seafins - Stab Mods

Warren,
They do start aft of the spar, I riveted mine since it was done after
the
fact, nut plates are a better solution. There is just enough clearance
for
the fins so you will need flush fasteners. I would see it MAM has new
heavy end rib if not I would add a doubler, I used three rows of 1/8
rivets
on 1.5 pitch (no doubler).
Al

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Seafins - Stab Mods

Posted: Sat Feb 18, 2012 9:12 am
by Al Paxhia
I measured the seafins and they are .080 thick.
Al
----- Original Message -----
From: "Al Paxhia" <paxhia2@comcast.net>
To: <murphy-rebel@dcsol.com>
Sent: Monday, April 19, 2004 10:35 AM
Subject: Re: Seafins - Stab Mods

Hi Don,
I will measure to be sure and let you know but I think .063.
Al
----- Original Message -----
From: "Don Boardman" <dboardm3@twcny.rr.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, April 19, 2004 10:30 AM
Subject: Re: Seafins - Stab Mods

Hi Al,

We are getting close!
What thickness did you use for your Seafins?

Don B.
From: Al Paxhia <paxhia2@comcast.net>
Reply-To: murphy-rebel@dcsol.com
Date: Mon, 19 Apr 2004 10:07:52 -0700
To: murphy-rebel@dcsol.com
Subject: Re: Seafins - Stab Mods

Warren,
They do start aft of the spar, I riveted mine since it was done after
the
fact, nut plates are a better solution. There is just enough clearance
for
the fins so you will need flush fasteners. I would see it MAM has
new
heavy end rib if not I would add a doubler, I used three rows of 1/8
rivets
on 1.5 pitch (no doubler).
Al

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Seafins - Stab Mods

Posted: Sat Feb 18, 2012 9:12 am
by Don Boardman
Hi Al,

We are getting close!
What thickness did you use for your Seafins?

Don B.
From: Al Paxhia <paxhia2@comcast.net>
Reply-To: murphy-rebel@dcsol.com
Date: Mon, 19 Apr 2004 10:07:52 -0700
To: murphy-rebel@dcsol.com
Subject: Re: Seafins - Stab Mods

Warren,
They do start aft of the spar, I riveted mine since it was done after the
fact, nut plates are a better solution. There is just enough clearance for
the fins so you will need flush fasteners. I would see it MAM has new
heavy end rib if not I would add a doubler, I used three rows of 1/8 rivets
on 1.5 pitch (no doubler).
Al

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