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post #1 of 11 Old 08-06-2012 Thread Starter
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additional potable water tank location

im looking for space for a water tank in my coronado 34. i think 50 gallons would be great for cruising in mexico. the space i found is the water heater compartment behind the engine compartment. 50 gallons is about 400 lbs.

is 400lbs added next to the rudder post too much weight?
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post #2 of 11 Old 08-06-2012
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Re: additional potable water tank location

I wouldn't think so on a 34 ft. well built 5 ton sailboat.

2 of my friends would equal that.

I suppose though, that if you're cruising with all the other related added weight that, that brings with it, you might want to check how she sits on her lines after you load it up. Shifting some of the other weight/gear around to keep a nice balance.

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Last edited by Tempest; 08-06-2012 at 03:43 PM.
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post #3 of 11 Old 08-06-2012
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Re: additional potable water tank location

I doubt the extra weight will trouble the boat overall but you'll certainly need to compensate with some weight up forward if you want to keep her on her lines.

Andrew B

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post #4 of 11 Old 08-06-2012 Thread Starter
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Re: additional potable water tank location

great, cuz my boat could use 50 gallons of clean potable water!

i was thinking it would start hobbie horsing.
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post #5 of 11 Old 08-07-2012
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Re: additional potable water tank location

Time to start doing a bit of math - no need to go extreme, but you should at least do a rudimentary weight and balance to get a feel for your loading.

I wouldn't get obsessed about sailing on her lines, but you should at least have an idea of how you are changing her floatation.

We once put 400 lbs in a 9,000 lbs boat a 'bit aft' of what we guessed was center of floatation - it lowered the stern by 2" and raised the bow by a lot, boat appeared to be popping a wheelie. Why - Center of floatation was significantly foreward of our guess.
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post #6 of 11 Old 08-07-2012
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Re: additional potable water tank location

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Originally Posted by tdw View Post
I doubt the extra weight will trouble the boat overall but you'll certainly need to compensate with some weight up forward if you want to keep her on her lines.
50 gallon rum tank forward of the rudder. Done!



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post #7 of 11 Old 08-07-2012
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Re: additional potable water tank location

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Originally Posted by WDS123 View Post
Time to start doing a bit of math - no need to go extreme, but you should at least do a rudimentary weight and balance to get a feel for your loading.

I wouldn't get obsessed about sailing on her lines, but you should at least have an idea of how you are changing her floatation.

We once put 400 lbs in a 9,000 lbs boat a 'bit aft' of what we guessed was center of floatation - it lowered the stern by 2" and raised the bow by a lot, boat appeared to be popping a wheelie. Why - Center of floatation was significantly foreward of our guess.
Clarification .... my use of "lines" was probably not strictly correct. I was really talking about balance fore and aft, so yes flotation is probably a better term to use.

I don't think hobby horsing is likely to be a major issue but as WDS says, get that weight distribution wrong and you will have her down in the stern which apart from any performance issues simply looks bad.

Andrew B

(Reality is most cruising boats of small to moderate size will inevitably be down on their lines.)

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Last edited by tdw; 08-07-2012 at 07:44 PM.
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post #8 of 11 Old 08-08-2012 Thread Starter
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Re: additional potable water tank location

ah yes looks. i'm planning on replacing my anchor rode from rope to chain. hopefully 300-375' of chain will add some weight forward...

now with my new measurements i'm not as confident that i will be able to squeeze that 50 gallon tank i was hoping for... back to the drawing board.

50 gallons would be nice
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post #9 of 11 Old 08-08-2012
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Re: additional potable water tank location

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Originally Posted by izzy1554 View Post
ah yes looks. i'm planning on replacing my anchor rode from rope to chain. hopefully 300-375' of chain will add some weight forward...

now with my new measurements i'm not as confident that i will be able to squeeze that 50 gallon tank i was hoping for... back to the drawing board.

50 gallons would be nice
new measurements ?

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post #10 of 11 Old 08-08-2012
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Re: additional potable water tank location

I do think 400 lbs right over the rudder stock will have a major effect on fore/aft balance. When the PO added two extra batteries to the lazarettes, that raised the bow about 2 inches. Now if I don't keep the bow water tank full, the boat looks too high at the bow.

Also you want to pay attention to placing the water tank as low as possible so as not to raise the boat's centre of mass too much, effecting the righting moment. In a knockdown, it could make a real difference to recovery.

Where are the existing water tanks?

How about adding qty 10 of 5 gallon jerry cans? They can be placed around the boat, nice and low, and placed so as to not upset balance (or even to improve it).

Bristol 31.1, San Francisco Bay
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