Hi Ian,
I've been looking at various types of hovercraft for a number of years, but have been "studying" in earnest for about 6 months now, I think the surveyor is the ideal cruising craft and it will do everything I'll need I'm sure, I'd like to build a 16' craft with the extra width, coincidentally I spent quite a bit of time admiring your craft today, It's amazing how quite you've got it. I'm going to try and keep mine as quiet as possible, living a few hundred metres from the beach, I hope to be doing a lot of coastal "stuff", so decibels will be an issue.
Are you going to start manufacturing otters, or selling the plans, like a sevtec operation?
Anyway, I'm sure to be worrying you at some point again in the not to distant future, I shall go back and work out H10 and H11 now.
Regards
Andy