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Go Back   SailNet Community > On Board > Gear & Maintenance > additional potable water tank location
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Topic Review (Newest First)
08-08-2012 08:12 PM
tdw
Re: additional potable water tank location

Izzy .... slightly off topic but in excess of 300' of chain on a 34'er sounds a tadge excessive to me. Maybe you have a specific reason for that but our heavy 34' steeler ran 120' chain plus the same of rope. Had we not moved on I'd have increased that to 150' of each but more chain than that in a smalll boat is for mine excessive unless you are planning on anchoring in some pretty hostile locations.
08-08-2012 08:01 AM
MarkSF
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).
08-08-2012 05:36 AM
tdw
Re: additional potable water tank location

Quote:
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 ?
08-08-2012 01:55 AM
izzy1554
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
08-07-2012 08:24 PM
tdw
Re: additional potable water tank location

Quote:
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.)
08-07-2012 01:33 AM
MedSailor
Re: additional potable water tank location

Quote:
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!



MedSailor
08-07-2012 01:08 AM
WDS123
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.
08-07-2012 12:50 AM
izzy1554
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.
08-06-2012 07:49 PM
tdw
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.
08-06-2012 04:38 PM
Tempest
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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