Originally Posted by mikehhogg
can a vessel with an open transom attain cat 3 or 4. My halmatic has a transom height of 150mm. I don't do any commercial so wouldn't be familiar with the regs. some open transom boats are round the world yachts.
I'm surprised that your freeboard is only 150mm I think you might be confusing height of transom from the deck and freeboard.
If your waterline is co-incident with the top of the sterndrive, which is where mine is, it will give you 250mm freeboard.
I think possibly the P22's were designed to a rescue boat code that probably also included a 250mm transom freeboard requirement. This is a bit of conjecture though.
The regs only seem to give you some slack in transom height if you operate in Cat 6 waters.
It doesn't help the OP though.