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Old 19-11-2011, 00:10   #1
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Bareboat to Full Load: What Does it All Weigh ?

Im trying to evaluate the capacity of a couple of bluewater sailing cats
in the 38-41 range and one of the builders has given me this list of
stuff for the max load above bareboat displacement that would load it
to DWL depth. The first column of numbers is the builders, and the
second is my adjusted numbers (for example, less crew, and less water
needed with a water maker, but more fuel for more range).

Note that the base bareboat includes
ANCHOR WINCH WITH 45lbs CQR & 55m CHAIN
RAYMARINE ST60 TRIDATA
REFRIGERATOR, FREEZER, LPG OVEN, STOVE (how much LPG do we need)
VHF RADIO
2 x BINNACLE MOUNTED STEERING COMPASSES
LONG RANGE BATTERY SYSTEM WITH AGM 400amp/hrs
ENGINE CRANKING BATTERY
STAINLESS STEEL BBQ

Now were new at this with no experience, just planning our future,
and Im sure there is stuff missing from this list. So what I would
appreciate from those of you with bluewater cruising and ocean
crossing experience is:

What items of significant weight are missing from this list and/or
what seems excessive?

Description ................ Their Numbers My Numbers
Crew 12 @165 each.............. 1984
Crew" 4 @200 ea ......................................800
Provisions + Personal effects.. 661............ 661
Water (760 litres) 200.8 gal ..1676
Water (151.5 litres) 40 gal......................... 335
Fuel (330 litres) 87.2 gal.......... 613
Fuel (567.8 litres) 150 gal......................... 1055
Liquids carried aboard 67 gal ...505 ...........305
LPG fuel & tanks......................................... 150
Store & spare gear...................... 55............. 55
Extra equipment.......................... 92............. 92
Dingy Raft .................................110............ 160
Motor 100 & Fuel...................... 150............ 250
Watermaker, Solar Panels, etc..................... 250
-----------------------------------------------------------------------------
Total MAX. load..................... 5696 ..........4113

Thanks and hope to see you out there
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Old 19-11-2011, 00:49   #2
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Re: Bareboat to full load: what does it all weigh

You will need entertainment so a guitar or banjo add about 20 lb with case & music book.

Add a solar panel or 2 and controller about 10 lb each
Pots and pans to cook with 10 lb
Storm jib, clip on about 15 lb
Spair Fortress anchor 15 lb
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Old 19-11-2011, 04:24   #3
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Re: Bareboat to full load: what does it all weigh

I sail a monhull so I am less careful about weight, but if your bluewater cruising you need lots of stores, provisions tools and spares.
I have no idea how much this weighs, but its a lot, lot more than your estimate.

Just to give you one example we have 80L of longlife milk on board. That is 170LB in milk alone.
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Old 19-11-2011, 04:34   #4
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Fishing gear, crab pots, snorkeling gear, wet suits, kayak, vacuum, bedding, cleaning stuff, wine, beer, medicinal brandy......laptop. Ropes, fenders, shopping trolley, folding bike, helmet, spare parts/ filters, tools galore, extension cord, spotlight, wet weather gear and life jackets. Generator (100kg+). Weights all variable. Sorry if these things are already accounted for.
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Old 19-11-2011, 04:37   #5
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Re: Bareboat to full load: what does it all weigh

Greetings and welcome aboard the CF, rgesner.

You might be interested in “Pounds per Inch Immersion” (PPI):
The weight required to sink the yacht one inch. It is calculated by multiplying the LWL area by 5.333 for sea water or 5.2 for fresh. The PPI usually increases as the hull sinks into the water as the LWL area is also increasing due to the shape of the hull above water.

Here ➥ http://www.tedbrewer.com/yachtdesign.html
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Old 19-11-2011, 04:47   #6
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Re: Bareboat to full load: what does it all weigh

"Liquids carried aboard 67 gal...305 lbs" is not quite right.

A US gallon (of water-milk-beer) weighs about 8.35 lbs, so 67 gallons will weigh about 560 lbs, not 305 lbs.

So that's another 255 lbs.

Good luck with your endeavors.
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Old 19-11-2011, 04:56   #7
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Re: Bareboat to full load: what does it all weigh

a big question is whether you will be a live aboard or cruiser. If liv aboard clothes, tools, water maker, solar panels, scuba gear, tv, extra lines and anchors, spare parts, dog, water hose, etc. etc. At a certain point you just get use to less speed, and more comfort/convenience
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Old 19-11-2011, 05:53   #8
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Re: Bareboat to full load: what does it all weigh

more batteries. they will never put enough batteries on straight from the factory. more is better and they weigh more than just about anything else
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Old 19-11-2011, 06:24   #9
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Re: Bareboat to full load: what does it all weigh

Tools (100+) engine spares and other spare parts, belts filters electrical etc. (???) secondary and backup anchors with mixed chain and rope rode (150+) dock lines and fenders (100), light air sails (50+ each), dinghy and engine (200+), beer...

BTW not to start an anchor thread but you can find more reliable-setting anchors than a CQR with more holding for the weight. I'd unload the CQR on eBay (still plenty of old timers out there who swear by them).
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Old 19-11-2011, 11:50   #10
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Re: Bareboat to full load: what does it all weigh

- And don't forget the weight of 50cm - 100cm of navigational pilot books, guides etc.! I currently have 85 cms!
- Far more electronic & radio equipment - AIS, radar, radar detector, HF radio and various radio antennas, EPIRB and PLB ....
- Wind generator, solar panels, water generator
- Spinnaker / gennaker and sheets and tackle
- Safety equipment to make you legal in your country of registration -liferaft, danbuoy, lifevests ...
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Old 20-11-2011, 14:18   #11
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Re: Bareboat to full load: what does it all weigh

You list a water generator, which seems like a good idea to me, but I've gotten comments from others saying that they are heavy, use a lot of electricity, and require a lot of maintenance.

West Marine says they only use "modest" amount of electricity and the KATADYN PowerSurvivor 80E (which seems about the right size) is only 35 pounds and provides 12.9 litres of water per hour using 12 Volt DC / 8 amp or 24 Volt DC / 5 amp.

So if you use watermakers, I'd be interested in your further comments.

Thanks - Rusty

Quote:
Originally Posted by multihullsailor6 View Post
- And don't forget the weight of 50cm - 100cm of navigational pilot books, guides etc.! I currently have 85 cms!
- Far more electronic & radio equipment - AIS, radar, radar detector, HF radio and various radio antennas, EPIRB and PLB ....
- Wind generator, solar panels, water generator
- Spinnaker / gennaker and sheets and tackle
- Safety equipment to make you legal in your country of registration -liferaft, danbuoy, lifevests ...
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Old 20-11-2011, 14:20   #12
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Re: Bareboat to Full Load: What Does it All Weigh ?

Thanks for all your helpful comments, keep 'em coming.

It is becoming clear that the boat builders overestimate the draft and bridgedeck
clearance (if they even list it) by specifying them only with an unloaded boat, and/or
specifying them with an unrealistically light load to DWL.

It is getting frustrating trying to find a truly long-range bluewater capable cat of 40'
or less with a good layout which can retain sufficient clearance and good
performance with a reasonable full load of 6000 to 8000 pounds.

:-(
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Old 20-11-2011, 14:41   #13
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Re: Bareboat to full load: what does it all weigh

Quote:
Originally Posted by rgesner View Post
You list a water generator, which seems like a good idea to me, but I've gotten comments from others saying that they are heavy, use a lot of electricity, and require a lot of maintenance.

West Marine says they only use "modest" amount of electricity and the KATADYN PowerSurvivor 80E (which seems about the right size) is only 35 pounds and provides 12.9 litres of water per hour using 12 Volt DC / 8 amp or 24 Volt DC / 5 amp.

So if you use watermakers, I'd be interested in your further comments.

Thanks - Rusty
I have a Village marine "Little wonder" watermaker. It's not heavy, guessing at about 15-20kg, makes 30 litres per hour, and uses 18 amps.

Maintenance is fine, as long as you keep using it. Basically just replacing the pre-filters every few months. (Operate in clear water only)

Watermakers do like to be used constantly. Like most marine stuff, it's lack of use that causes the problems.
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Old 20-11-2011, 15:34   #14
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Our Sea Recovery watermaker weighs about 20kg, produces 30 litres an hour and uses 9 amps. Works great so long as you use it regularly. We wouldn't be without it.
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Old 28-11-2011, 18:34   #15
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Re: Bareboat to Full Load: What Does it All Weigh ?

Quote:
Originally Posted by rgesner View Post
Thanks for all your helpful comments, keep 'em coming.

It is becoming clear that the boat builders overestimate the draft and bridgedeck
clearance (if they even list it) by specifying them only with an unloaded boat, and/or
specifying them with an unrealistically light load to DWL.

It is getting frustrating trying to find a truly long-range bluewater capable cat of 40'
or less with a good layout which can retain sufficient clearance and good
performance with a reasonable full load of 6000 to 8000 pounds.

:-(
check out the Leopard 39 - im dealing with the same issue and at 250kg per cm immersion its about the best ive found under 40 feet. started a thread on this couple of days back
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