: I am building a wood Frame Yost Sea Ranger large coaming. I was wondering if
: 1/4 inch oak will be strong enough for the cockpit bottom boards. Since
: this is the large coaming version, these boards need to span 29. Thanks
: for any advice (for reference, Yost recommends 3/8" cedar)

Hi Dan,
If the 3/8" cedar works then 1/4" oak should do just as well.
You can check it by resting the oak strips across two blocks of wood the right distance apart and sitting on them.

Hope this helps,
Mike Savage
South West Cork