Subject: Re: [harryproa] Liveaboard deck plan
From: "Rob Denney" <>
Date: 4/7/2008, 11:32 AM


Don't forget that the ends of the cabin will have to slope for
aerodynamic reasons, so you will not have full headroom there. You
will on the sides which are vertical. Bunks which are not accessible
from the sides are industry standard, but are not easy to get in and
out of.

The charter boat lee hull, deck, bridgedeck and cabin roof are all
25mm foam with 900 triax glass each side. Weight per sq m (10.75 sq')
is about 6 kgs (13.2 lbs) so 1.22 lbs/sq'. The rest is 20mm foam with
600 double bias each side, 4.5 kgs per sq m/0.9 lbs/sq m. depending
on what system you use, you can add between 10-20% of this for
overlaps, joins, paint and bog, and another 10-20 for bulkheads and
structural stuff.

2+ tonnes of payload (there is a heap of stuff required additional to
what you have mentioned, but half a ton of food may be overkill, and a
watermaker is a better solution than carrying it), you will need a
55-60 foot lee hull to do 15 in 15. The ww hull will be 40-45. Not
all of what you are carrying needs to be in the ww hull.



On Mon, Apr 7, 2008 at 9:06 PM, gardner.pomper <> wrote:
> Hi,
> My earlier posting, on the Liveaboard 55, kept growing and was getting
> too close to being the same boat that Rob is already building for the
> 60' charter version. I wanted to give this another try, cutting back
> some of the feature creep to get closer to what I (and/or my wife
> <grin>) needs, as opposed to everything we both want.
> Along with that, I am adopting Rob's concept of keeping all the living
> space out of the hulls, which I am beginning to understand better,
> since it would elminate all the interior finishing, which is very time
> consuming (read expensive). So, I decided to just draw the bridgedeck,
> which can then just be plopped onto the appropriately sized hulls for
> the displacement (oversimplification). If this is too beamy for the
> length, we can just allow the bunks to overhang the ww hull.
> For the weight calculations, I could use some info on what a rule of
> thumb is for structure. I have about 600 sq ft of deck (since I want
> an exterior walkway from the help to the windward hull) and about 500
> sq ft of hardtop. I then estimate 200 sq ft of counter/bunk top and
> 400 sq ft of counter/cabinet sides. How do I figure the weights of
> this, assuming I use resin infusion over foam, which seems to be the
> simplest, lightest way to go?
> Beyond that, I have the following weights (in pounds) for equipment:
> 12' catamaran dingy 160
> 25HP outboard 150
> Propane Stove w/oven 75
> diesel generator 350 ?
> Lectrasan 25
> Head 50
> Microwave 30
> Fridge/freezer 50
> batteries 300
> solar panels 150
> crew 500
> 200 gal water/fuel 1600
> provisions 1000 ?
> Total 4500 lbs (approx)
> So, if I want to sail at 15 knots in 15 knots of wind, what size hulls
> do I need?

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