Who do I find out my boats pay-Load? - SailNet Community
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post #1 of 29 Old 08-05-2013 Thread Starter
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Who do I find out my boats pay-Load?

I have a C&C 30 mk1
How would I find how much weight I can she can haul? with provisions and water and fuel etc.

Here is all I know..
Specifications

LOA 30 ft.
LWL 24 ft. 11 in.
Beam 10 ft.
Draft 5 ft.
Disp. 8,000 lbs.
Ballast 3,450 lbs. lead
Sail area 459 sq. ft.
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post #2 of 29 Old 08-05-2013
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Re: Who do I find out my boats pay-Load?

The designer should know.


OK, when I say "should" he should more than really, really, know. But in the old days when they just knocked up a boat by 'experience' and sight of thumb they couldn't really at all, could they?

But your boat... is it fibreglass and built in the 1970's or 80's or newer? They designer should know.

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post #3 of 29 Old 08-05-2013
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Re: Who do I find out my boats pay-Load?

What is a "payload", I can't find it listed in any of my reference books on design.

There is no hard answer to your question but let me try. Your boat will sink 1" for every 900 lbs. ( approx.) you load on it. Of course this number goes up as you immerse the hull and the waterplane area increases. This is known as "pounds per inch immersion". It has nothing to do with the displacement of the boat. It is a fucntion of waterplane only. But, at some point you will run out of volume to load more gear and your added weight will have reduced your SA/D to the point that the boat sails sluggishly. If you have added weight unevenly fore and aft you may also effect the trim of the boat so it is either stern down (more likely) or bow down (less likely). If you begin stacking gear on deck you will raise your VCG and harm your stability. I think common sense will tell you when you have run out of volume for more gear. But no, there is no such thing as a "payload" for as sailing yacht. Not in my experience anyway.
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Re: Who do I find out my boats pay-Load?

ltgoshen: Watch your waterline and don't let it sink below the water. I think what you mean is the boat's capacity. After 1972 boats 20 feet and under that use an inboard, outboard or I/O must have a capacity plate that provides that information. Not so on sailboats over that size.

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post #5 of 29 Old 08-05-2013
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Re: Who do I find out my boats pay-Load?

Dr:
There is a good chance he can't see his waterline! He probably has only a vague idea where the actual DWL is. It sure as hell isn't the bootstripe. Some builders will scribe a feint line at the DWL. This is easily eradicated with appplications of bottom paint. Others might have a notch in the stem and the stern to indicate the plane. But I doubt he has either of these and the bootstripe will be probably about 4" above the DWL but there is no way of knowing. The only way he can effectively determine his DWL is to get freeboard measurements from the designer or perhaps an old IOR measurement certificate.

If it were my boat and I wanted to know where the DWL was I would get the very best profile drawing that came from the designer's office and with that in hand I'd stand back and compare what the drawing shows to what my eye sees. But I have a damn good eye.

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Last edited by bobperry; 08-05-2013 at 06:06 PM.
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post #6 of 29 Old 08-05-2013 Thread Starter
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Re: Who do I find out my boats pay-Load?

I was mostly trying to get a tonage on gear and provisions for this model boat.. May not be one out there. Here is were the boot stripe was put. I'm afraid it dont tell me much being new to all this stuff.


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post #7 of 29 Old 08-05-2013
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Re: Who do I find out my boats pay-Load?

Like all boats, it should be capable of hauling enough beer to last the crew a week.
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Re: Who do I find out my boats pay-Load?

lt, what are you putting on this boat that you're afraid it will be too heavy? The average boat this size can hold quite a lot. As for provisions, you can't possibly eat that much.

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post #9 of 29 Old 08-05-2013 Thread Starter
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Re: Who do I find out my boats pay-Load?

Thinking of taking some supply's south one day. Med. Just thinking right now.
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post #10 of 29 Old 08-05-2013
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Re: Who do I find out my boats pay-Load?

That's exactly what I was trying to tell you.
Sit up straight.
Spit out your gum.
THERE IS NO HARD ANSWER FOR THIS.

It's a common sense thing.
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