searider 5,4 transom

mike-stgt · 14 February 2008, 18:11

Hi there ,
I had to open my transom, because it was shortened ti fit to a short shaft.
I saw out a piece of the board from inside , it is made from a 20mm and a 15mm board glued together.. It is not a strong board like oak, it
is like normal pine plywood used for containers.

Does somebody know, what kind of plywood it was used by AVON?

I think , i have to renew the transom to have the strenght for a 4cyl engine.

Nos4r2 · 14 February 2008, 18:32

I think you would be best advised to phone Avon and ask them. It's marine ply-but exactly what grade I don't know.

mike-stgt · 14 February 2008, 18:59

Hi, I mailed to AVON a few times for some information.
It wasn`t useful. I only get the advice to contact the german importeur.
They don`t answer, maybe they want to sell big boats and make big
service.
Maybe someone knows , what waterproof plywood it was used.

Mike

Searider · 14 February 2008, 19:41

Hi Mike,

Virtually any "marine" plywood should be OK.

the "Marine" plywood specification we have here specifies that the adhesive used in its construction is water and boil resistant and that any knots or voids must be smaller than a certain size.

As an alternative you could use what we call WBP plywood - water and boil proof. Same water resistance as Marine but allowed to have larger knots or voids in it.

A greater number of thin veneers in the board is a pointer to quality as well.

Whatever you use ensure that you cut away any decayed or suspect parts of the old transom - it's very difficult to stick to wet wood!

Duncan

PeterR · 14 February 2008, 20:08

The main difference is that the marine ply is salt resistant very important dont use ordinary ply

mike-stgt · 14 February 2008, 21:08

My question was to check the old transom and the material they used.
It is not very hard to saw, drill and mill.
So i wonder about it is fouled or it was orginal not a very hard wood.

For a new on i have boil and waterproof plywood. It is certified BFU.

Mike

ian parkes · 14 February 2008, 21:09

Marine Ply has many grades .I wouldn't bother with WBP as sold by builders merchants , the quality is vary hit and miss these days
A very high quality marine ply will have no voids and hardwood vineers used throughout .
The spec should read tropical hardwood marine grade WBP bonded quality in accordance with BS1088. It will cost between £50 and £100 a sheet depending on the surface vineer etc . The best ply will also have a Lloyds register approval.

Speak to these people for prices and advice William T eden
head office is at 01634291010 they have branches accross the country and supply lots of major boatbuilders . WWW.edens.co.uk

A decent carpenter should be able to repair that transom ok and maybe fix some sheet metal to it to strengthen it. probably cheaper to find someone who uses marine ply and will only charge for the amount used instead of full sheets .

mike-stgt · 15 February 2008, 20:27

Hi there, in Germany it is sold as the same product.
Okume plywood , BS 1088, aprooved by the German Loyd.

But the original transom looks like a usual board for house building and cement works.

ian parkes · 15 February 2008, 22:16

Quote:

Originally Posted by mike-stgt

Hi there, in Germany it is sold as the same product.
Okume plywood , BS 1088, aprooved by the German Loyd.

But the original transom looks like a usual board for house building and cement works.

german houses maybe

sorry didn't realise you were in Germany , my link not much use then .

mike-stgt · 15 February 2008, 22:44

Anyway thanks for your information.
A friend of mine goes every week to england with a truck, so it will be no problem to buy there .

ian parkes · 15 February 2008, 23:21

Blimey are you sayin its even more expensive over there .

I cut and machine a lot of 18 and 12mm wbp bonded for a customer who makes bee hives . he pays about £20 per sheet for it but i wopuldn't use that stuff , its got a nice surface but lots of voids and crappy wood in the internal layers . We often soak offcuts to test it and it is waterproof though .

All you need are a few offcuts from a boatbuilder
Good luck with the repairs

mike-stgt · 23 February 2008, 21:31

Hi there, as I was wondering about drying the board in the transom, i decided
to cut it out for a new one. It didn`t felt strong enough for a 90HP outboard.
So i will cut 2 new boards, the outer with 19mm and the inner with 12 mm.
I`ll take wbp plywood and glue it with epoxy and fibre.

Greetings from Stuttgart
Mike