Sea Sled Madness: It's Incurable

[DogCavalry]

What did you hit?

Nothing. Bought it in a hurry. Needed a commuter for daily life. First time on the tidal grid.

 

[DogCavalry]

Soon I'll have both time, and money.

 

[DogCavalry]

@baeckmo, among others, has advised me that there is greater utility with the cabin aft. Squares are 6", 15cm
All folks crudely drawn are me, at 6'4", 194cm. I left out the baldness and potbelly, because they are not informative, not because I'm vain.

 

[DogCavalry]

Drew the splashwell wrong. Cabin behind aft passenger is shiftable for working on engines. Tick marks on top view of transom show outboard centers

 

[bajansailor]

Have you sketched a transverse section through the cabin as well?
If not, then I think this would be useful.
It might even look like you could increase the headroom in the cabin a bit (as it looks rather claustrophobic inside at the moment).
You should (ideally) also try to do a rough stability calculation, or at least try to estimate the effect on stability when five lads (all 6'4" and of corresponding weight) are seated inside, and you are travelling along with the sea swells on the beam - how much effort would be needed to try to induce a capsize?
Is the cabin watertight, with proper windows in the front and sides, or is it mainly just to give some shelter from green water hitting from the front, and rain / spray hitting from above?

 

[DogCavalry]

Hard questions are the best questions. Easy ones make poor boats.

The headroom allows 2"/5cm above the head of the 99th percentile in height. Probably could go up a bit. @baeckmo warned me against doors no one wants to go through. It's weather proof, but with the overlapping ventilation windows. Well, front windows slide. I was much impressed by your tales of handling a tug on your own.
Beam stability, judging by her big sister Serenity should eclipse everything else around.

 

[Darkzillicon]

I know that you can get around windage by using curved surfaces. I am not sure how you have considered windage but given the cabin height… all things considered it’s probably better to have the stern blown around than the bow.

 

[DogCavalry]

The cabin can't really get lower and still put humans inside.

 

[DogCavalry]

Huh. Apparently I can't count. I drew the picture 5 squares too long.

 

[bajansailor]

Can you post the shortened (by 5 squares) version when you have re-drawn it please?

 

[fallguy]

Huh. Apparently I can't count. I drew the picture 5 squares too long.

Too far aft?

I apologize, but I wondered if that boat would ever get out of the hole as drawn. Wasn't in the mood to throw shade on the drawing..

 

[bajansailor]

You could maybe try a couple of section sketches as well - one through the cabin, and one in way of where the chap is standing on the foredeck - to see how they look?

 

[DogCavalry]

I drew the sketch again with human shaped folks, and correct proportions. And a section for better visualization. It's through AA.

 

[Cacciatore]

Good morning DogCavalry, thank you for sharing your project, which is quite intriguing. At a glance, I strongly advise reconsidering the weight distribution on board (will you be installing 1 or 2 outboard engines?)—especially with this type of hull, as you might encounter a hump zone at very low speeds. Take a look at the luxury tender taxis in Venice (ITALY) to get an idea of how to better distribute the weights along the entire boat. Just my 2 cents.

 

[DogCavalry]

Good morning DogCavalry, thank you for sharing your project, which is quite intriguing. At a glance, I strongly advise reconsidering the weight distribution on board (will you be installing 1 or 2 outboard engines?)—especially with this type of hull, as you might encounter a hump zone at very low speeds. Take a look at the luxury tender taxis in Venice (ITALY) to get an idea of how to better distribute the weights along the entire boat. Just my 2 cents.

Thanks for your interest, @Cacciatore . It's an unsolvable conundrum. Most of the time this boat will run with one adult and her cup of coffee. On some days, five men, their tools and 300kg of plywood on the front deck. My first iteration had the cabin as far forward as possible, so that the nominal LCM was clear for heavy loads, but the feedback from @baeckmo was that an aft cabin would be the better compromise.