New engine hatches.

[burgundyben]

I am planning my new engine hatches, long over due.

I was thinking 12mm ply.
¼ teak from robbins epoxied ontop
A rectangle of mahogany stiffback underneath around the perimeter with a cross forenaft and thwartships too.

I thought the stiffbacks would be inch by 2 inch, glued and screwed with the inch face against the underside of the ply. The biggest unsupported panel would be about 18 inches by 2 ft.

I’m a fat git.

Yo uthink these would be tough enough?

 

[Seanick]

Yes.

 

[Peterduck]

If you let your plywood into a rebate on the side/top of the perimeter mahogany, you will protect the end-grain of the plywood from water ingress, which will lengthen the life of the plywood. The rest of your plan sounds fine.
Peter.

 

[burgundyben]

The current hatches and cockpit sole boards have got a teak fiddle glued and pined to the edge of the ply, the 1/4 inch teak has a border around the outside with mitre cut corners, the border sits over the top of the fiddle.

I thought I'd stick with that. Its undercover in the cockpit all the time and I'll epoxy the ply before anything else so it should be fine.

 

[tcm]

I think you should plan to engineer in some acoustic foam inside, the stuff with plastic interlayer is ok, and summink like two layers of this makes massive dfference to noise levels. Also those hatches have to be supersnug, again to elimnate noise sneaking out from engine into cockpit