Repair & maintenance: Internal or External Flange Anderson Self Bailer?

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Internal or External Flange Anderson Self Bailer?

Printed From: Yachts and Yachting Online
Category: General
Forum Name: Repair & maintenance
Forum Discription: Questions & tips on the subject
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=8842
Printed Date: 14 May 25 at 1:03pm
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Topic: Internal or External Flange Anderson Self Bailer?

Posted By: jugman9969
Subject: Internal or External Flange Anderson Self Bailer?
Date Posted: 01 Jan 12 at 3:53pm

Just bough a wooden Mirror for my son.

I need to install a self bailer, probably Anderson.

Would it best to purchase an internal or external flange Mini or Super Mini self bailer as I am not sure which type of flange to go for?

Thanks

Replies:

Posted By: JimC
Date Posted: 01 Jan 12 at 4:12pm

Is there nothing at all at the moment?

All else being equal I like the internal flange ones, but you are normally forced to use one alternative or the other by the hull skin thickness. Use the same as the next two mirrors in the dinghy park!

Posted By: jugman9969
Date Posted: 01 Jan 12 at 6:40pm

We have joined West kirby Sailing Club, full of cadets, not many mirrors. To be honest not sure what the difference is....is the flange the flat piece of alloy?? Sorry I am not sure.

Posted By: JimC
Date Posted: 01 Jan 12 at 8:23pm

Internal/external flange...
Its about how they fit in the boat. When you look at the bailer the flange has the bolt holes in.

If the flange is flush with the underneath side of the bailer then this is for external fitting. The bailer is installed from the outside. As well as the slot or the bailer you have to cut away the external surface of the hull so that the flange is flush with the hull. If you have a boat with an inch thick wooden plank floor this is easiest, you lose a bit of stength in the floor, but if its solid and an inch thick who cares...

If on the other hand the bailer structure projects below the flange this is internal fitting. The bailer is installad from the inside and the flange bolts against the inner skin. This means you have to juggle a bit to get the outside surface flush with the hull skin. Usually its just a question of adding a gasket or three, but on very think skinned boats you might need to make a recess.

They probably fit the same way on Cadets and Mirrors...

Posted By: FCDB
Date Posted: 01 Jan 12 at 11:29pm

This is a job I have done on my Mirror. If you have a ply hull, then the external flange model is the one to use.

It takes a bit of care to fit, but the fitting comes with a template and instructions. The care is needed to get a neat job and snug fit. The Anderson fitting is very nice piece of kit.

In summary the work is as follows:

Read instructions, plan work and do a dry fitting at each stage.

Cut the main hole in the hull, by drilling pilot holes at each corner, then use a jig saw to cut the hole. Clean up the ply by lightly sanding the edges.

Then to get the flange flush you will need to carefully shave off the top ply layer, this is about 1mm thick. Use the bailer as the template and lightly cut the top of the ply with a sharp stanley knife. Don't go too deep you only need to go through the top skin of ply. Remove the bailer and then shave off the top layer of ply with a sharp chisel. This is quite easy to judge as you will get down to the glue layer. Check for fit, shave a bit more if required. When complete seal the exposed wood with varnish or epoxy.

Leave to harden overnight.

When the sealing coat has set, bed the flange down on the caulking paste supplied with the fitting.

When fitting the bolts, dip them in varnish to seal the hole in the ply, this prevents water penetrating the ply and causing rot.

For a super smooth finish, use plastic padding car filler to fill the joint and bolt heads. Sand with fine wet or dry paper used wet and make good paint.

Tools needed, drill, jig saw, Stanley knife and sharp chisel. Small tin of yacht varnish. Car body filler

Posted By: jsambrook
Date Posted: 09 Sep 12 at 1:06pm

I've just bought a Mini Bailer, asked the supplier for the missing instructions and was informed that it doesn't come with any. Also FCDB mentioned caulking paste, again this doesn't seem to be an included item. The template is there though :)

All that said, thank you for the helpful instructions above. The only thing I'm left uncertain about before proceeding is siting. Any suggestions on where, this time deliberately (!), to put a hole in my Mirror?

Again, thanks for the helpful postings!

Posted By: JimC
Date Posted: 09 Sep 12 at 5:30pm

You want it where the puddle of water is deepest on a beat:-)

Posted By: SoggyBadger
Date Posted: 09 Sep 12 at 6:02pm

Originally posted by jugman9969

Just bough a wooden Mirror for my son.

I need to install a self bailer, probably Anderson.

Would it best to purchase an internal or external flange Mini or Super Mini self bailer as I am not sure which type of flange to go for?

Thanks

The internal flange ones. External flange ones are made for GRP boats which have a recess moulded into them at the bailer position.

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Best wishes from deep in the woods

SB

Posted By: jsambrook
Date Posted: 09 Sep 12 at 8:24pm

I was wondering more about any potential structural problems caused by being too close to the daggerboard box?

Posted By: Rupert
Date Posted: 09 Sep 12 at 8:27pm

Leave 1/2 an inch or so clear of the case from the edge of the bailer, and you'll be fine - the actual hole will then be an inch or so clear.

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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686