A Photo & Discussion Forum for Wharram Design Enthusiasts
Was the compartment used to store propane bottles? Any leaking propane, heavier than air, would simply fall out of the hole.
You should be able to close up the holes. But I imagine that they exist for a reason. Is there any way for water to get into that compartment - either by rain, wave, or seas? It's location makes be believe that water (or something else) was making its way into that compartment and they wanted it to drain out naturally without the use of a pump or sponge. It is something to investigate.
I would just fit a rubber plug from the inside and inspect it regularly to see what happens.
As others have said, it must have been made for a reason, but we don't have that hole on our Pahi 42. Main problem I have with that compartment is that it gets a bit humid as there is no air circulation. I've been thinking to put a small watertight hatch through to the cabin, but a bit reluctant as it would be a potential weakness. Personally I'd clean and dry out that compartment and seal the hole up.