Hull Strength??

[Skink]

You guys are outstanding, the 21 was a typo, it is a 20 with the two large foam filled stringers. I was thinking about filling the void between the hull and the liner with 2lb foam, mostly for my peace of mind. What do you think? Good idea?

[gofastsandman]

Originally Posted by Skink

You guys are outstanding, the 21 was a typo, it is a 20 with the two large foam filled stringers. I was thinking about filling the void between the hull and the liner with 2lb foam, mostly for my peace of mind. What do you think? Good idea?

No.

If you wanna foam, fill under the gunwhale, but not around the filler hose. I suspect they do that for a reason however. Where Wolves of LLoyds or some such authority.

FRP is designed to flex for a looonng time.

The old racers are what I would think to be thin.

I would be wrong.

Here we are these many years later, and they are still in our thoughts and desire.

Gobble,
GFS

[bly]

Originally Posted by Skink

You guys are outstanding, the 21 was a typo, it is a 20 with the two large foam filled stringers. I was thinking about filling the void between the hull and the liner with 2lb foam, mostly for my peace of mind. What do you think? Good idea?

It would be impossible to put expanding 2 lb foam into that small area to I guess stop what you perceive as a weak area?? No it is not. Yes you can have what they call an oil can effect because both pieces are not extremely thick or cored. But as Bushwacker said and documented. No failures. Expanding foam would only cause probably the inside liner to bulge in different areas and look ugly. Yes there are many things that need improvement to the 1960s moseley hull. They used 20 inch engines back then but now all want 25 inch engines and the added safety height for water control. Also plywood was the only material available back then for transoms and floor. Now many of us are using coosa foam glass type high density material. If your boat gains any weight with water absorbtion of closed cell foam or plywood cores getting penetrated by water. Then the floor will be two low to self bail. Especially with new 4 stroke heavy engines. There are improvements that can be made but injecting 2 lb expanding foam into the liner void is not a good move.