not sure if this has been presented or attempted yet, but I was considering a concept such that the leeward-side of the main hull had a bowed bulge at the midline (not sure of the technical term), similar to many monohulls; however, maintain a more multihull typical slender-hull on the windward-side of the main hull.

I’m no ship builder but have wanted to build my own little boat for a while now, I’ve been mostly in to catamarans but have in the last year really started to gravitate towards flying/windward/pac. proas.

here’s some images to help explain what I am trying to get across
proa-hull-bowed
monohull-bowed-hull
another bowed-hull

not sure if this has been presented or attempted yet, but I was considering a concept such that the leeward-side of the main hull had a bowed bulge at the midline (not sure of the technical term), similar to many monohulls; however, maintain a more multihull typical slender-hull on the windward-side of the main hull.

I was considering this concept as it’d, hopefully, provide 3 things:
1. help alleviate capsize to leeward via hull shape providing a more gradual roll in the hull and stick out enough to assist in righting the boat
2. help alleviate capsize to leeward via shifting hull balance towards windward, laying more onto the akas and ama since the hull likely wouldn’t float upright on its own
3. bonus extra space, though not much

this is somewhat similar to a lee pod except it seems like a safer design in regards to oncoming leeward waves

any input on this concept is well appreciated

I should note that the red line in the grid view is not necessarily the waterline, simply an axis in Blender, which I mocked this up in. the render above it has a blue ocean waterline, which I simply guessed at for now.
what software is recommended to do more serious but still hobby 3d designs? 😊 i’ve heard solidworks is good

Hi scape. For some reason this thread didn’t show up in the latest posts list? Anyway, the hull shape you propose has been used before, most certainly, although i don’t have the links right now from my mobile. You have to be careful to keep the waterplane symmetrical, or with the correct symmetry. I’ll see if i can dig up some links tomorrow when i get up. -Thomas

Yes, Scape, welcome! Sorry it is a belated welcome. i don’t know why your post managed to ‘fly below the radar’.

Hmm, maybe I mis-remembered. There are some hulls I’ve seen that have quite a flared lee side, which I guess is done with the same idea of capsize stability. But none too the same extent. A similar effect could be had by extending the “lee pod” across the whole length of the hull. That way you don’t need to have the really flared hull side, which is theoretically slower than a thinner hull section. -Thomas

Had a similar idea some years ago. Integration of a kind of lee pod in the hull line with opposite asymmetry, under and above cwl. May be an interesting shape for a bigger cruising proa. It was a concept, which I refined to the current P12 layout.

Hi Scape
I Think the closest example to what you are looking for would be Alexander’s boat that he built in Thialand NIXE in the Designs and Concepts Thread..He addresses in his posts just the issues you are thinking about. Over all, Nixe is similar in size to what you are showing in your posts. He dispensed with a lee pod and instead built a highly flared hull for the reasons you allude to.

Thanks for the replies, there is some good information here. Alexander’s boat is incredible, I’d like to see more videos of it in action. Such a quick build!

I’ve been considering roller, unstayed masts made of carbon fiber. Sounds exotic but is sold by Hobie.
They’re boomless and flex well. Has anyone considered this I wonder, specifically Hobie’s. I was considering 2 of them if size permits. The only thing that stumps me a bit is controlling if wind comes aback on them. The main sheet seems complicated depending on how I’d implement this. More later, I’ll draft some images up, perhaps in a new thread, or maybe rename this one if possible.

Thanks!