82 handmade GRP hull

[fallguy1000]

Xps has no crush strength. Do not use it in impact areas or transom core or anyplace subject to clamping or crushing loads.0

[fallguy1000]

Stop the project if you put xps in your transom. It will not support any engine bracket.

Transom cores need to be plywood or 28# structural foams.

[jacquesmm]

I agree: you need foam with a high compressive strength.

[nel.edgar]

Stop the project if you put xps in your transom. It will not support any engine bracket.

Transom cores need to be plywood or 28# structural foams.

sorry i did not mencioned that im not gonna put foam on transom for shore! its gonna be plywood! it was just a test to see how strong could it be...

BTW... will it be wrong if i use Honeycomb in the cabin wall division and in the cabin seats will it be more ligth weigth

[fallguy1000]

The cabin wall might be a structural bulkhead; so verify whether it is structural first and build it strong if so.

The furniture is all up to you.

All the best.

Best way to take boat pictures is from farther away and then closer. Hard to tell what you are doing in some of your close ups.

[Fuzz]

If you use plywood in the transom when you clamp it to bond it to the glass skin it will pull that small bow out of the glass skin. You asked about honeycomb for the cabin. I have used it for both the deck and cabin. It works great for decking. I really like it there. It will work just fine for the cabin also but it is a pain in the butt to deal with any exposed ends. For the cabin I would prefer using foam but foam is much more expensive so there is that downside.
I can tell you have been busy with the sander. The transom has been cleaned up very nicely

[fallguy1000]

Fuzz has a good point. Foam offers a bit better insulation and less condensation than honeycomb.

I am using honecomb on my cabin base and cockpit. The cabin base has an airspace; so plenty of i sulating between tow layers.

Cockpit is outside..

[nel.edgar]

Fuzz has a good point. Foam offers a bit better insulation and less condensation than honeycomb.

I am using honecomb on my cabin base and cockpit. The cabin base has an airspace; so plenty of i sulating between tow layers.

Cockpit is outside..

well...now u got me thinking a lot about the diferent materials...but the true is that Honeycomb is more easy to get for me and also less expensive...

Anyway...my ideas are:

For Transom:
1 - bond 3 layers of 12mm marine plywood together using a mix of epoxy, milled fibers and cabosil.
2 - clean the inside skin with acetone and bond the plywood with the same epoxy mix and using bolts and boards of 3x6 mm as clamps...
3 - then fill the interior gaps and corners with samme epoxy mix and glass 2 layers of 450g biaxial.

question: should i do one first glass of biaxial on the inside transom skin before i bond the plywood panel? im asking this because the transom skin is full of holes beside the great hole of the old inboard stern....

[nel.edgar]

This is my other option for the transom... used the Google Sketchup








Do this transom restoration option could be less expensive than the Bracket??

[fallguy1000]

Clamps sound too small. 3x6mm is too small

No on the xtra glas.*

Glass schedule sounds light.

*If you are gonna bracket; the bracket company will give you the spec, layup, etc.