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Old 13-10-2021, 13:24   #16
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Re: Gaining Draught? Tanks Empty?

Aussie Monty:

We draw 2.2m. Wait for Springs; half moon was yesterday. The best you can do is launch 1 hr. before high water, enough time to moosh through the mud and get out into the bay. Point 1 m = 4 inches. Consider hauling where there's more water next time.

On edit: Sentence beginning, "Point" looks wrong; try this} 0.1m=4" looks better. He is going to need to heel the boat if he's up the creek by Huskisson: He will require 1.3m tide to get out otherwise.

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Old 13-10-2021, 13:26   #17
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Re: Gaining Draught? Tanks Empty?

You could experiment with hydrogen storage. For example, filling the space in the mast, inflating your dinghy with it, etc. I store mine in mylar balloons.

air weighs 1.3kg per cubic meter

you could also try offloading as much stuff as possible and bringing it to the boat by dingy later.
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Old 13-10-2021, 16:39   #18
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Re: Gaining Draught? Tanks Empty?

Hanging masses out from the hull may well be the answer. We ran aground near the entrance to the marina channel at Carnarvon Western Australia yonks ago (missed the entrance by about 50 m). There was hardly any swell. The boat is heavy at 35 tons with an 8 m long keel and 2.3 m draft. After setting an anchor and then much winching and swearing we resorted to filling three 50 Litre barrels with water and hanging them from the main boom. We then pushed the boom out and the resulting heeling was sufficient to lift the keel off the sand which allowed us to motor off. Easy to control. May work for the Adams 45 which I believe has a fairly short keel at the very bottom. The Adams 45 is hardly a beamy boat which may mitigate against greater keel lifting. Because of the radial geometry when the keel swings, you may only get a very small initial lifting effect, so the greater the mass and the further out from the boat the better.
A couple of passing trawlers offered to pull us off but one of my older, wiser crew advised against it. Apparently, from his experiences this would most likely lead to damage.
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Old 13-10-2021, 17:48   #19
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Re: Gaining Draught? Tanks Empty?

Blimmy, I'm still learning English at the age of 64.

draught
[draft]

NOUN
British spelling of draft, , , .
ADJECTIVE
British spelling of draft.

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Old 13-10-2021, 18:30   #20
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Re: Gaining Draught? Tanks Empty?

The Adams office should be able to give you tons per c/m of immersion,this is one number included in BoB Perrys line plans ,it verry helpful in doing a refit .⛵️⚓️
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Old 13-10-2021, 19:03   #21
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Re: Gaining Draught? Tanks Empty?

The Adams office should be able to give you tons per c/m of immersion,this is one number included in BoB Perrys line plans ,it verry helpful in doing a refit .⛵️⚓️
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Old 13-10-2021, 21:54   #22
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Re: Gaining Draught? Tanks Empty?

Quote:
Originally Posted by Searles View Post
The Adams office should be able to give you tons per c/m of immersion,this is one number included in BoB Perrys line plans ,it verry helpful in doing a refit .⛵️⚓️

What is "c/m" supposed to represent? (coulombs per metre? )
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Old Yesterday, 07:08   #23
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Re: Gaining Draught? Tanks Empty?

Also consider inducing heel to pick up the keel bottom as you go over the bar. Raise a drum of water on the end of the boom for instance, or have a heavy power boat run along side and pull the main halyard over (or both).
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Old Yesterday, 11:31   #24
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Re: Gaining Draught? Tanks Empty?

1m = 39inches
10cm = 4inches


Some of us have worked with both systems for years !
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Old Yesterday, 12:06   #25
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Re: Gaining Draught? Tanks Empty?

Quote:
Originally Posted by rla View Post
1m = 39inches
10cm = 4inches


Some of us have worked with both systems for years !
If you are a British or Irish Baby Boomer you will be used to both and if you are a British or Irish carpenter you will still be using both! (Also if you have had a career in aviation). I often mix the measurements, using whichever is the most convenient for what I am trying do or measure. But who can remember Rods\ Poles\ Perches as measurements of length? or chains for that matter, although we still use cables. Sadly fathoms are rapidly being superseded by metres for depth on pretty well all nautical charts now.
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Old Yesterday, 12:29   #26
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Re: Gaining Draught? Tanks Empty?

Quote:
Originally Posted by billgewater View Post
A couple of passing trawlers offered to pull us off but one of my older, wiser crew advised against it. Apparently, from his experiences this would most likely lead to damage.
The one incident I know of in similar circumstances the rudder got bent during the ungrounding. So probably a wise choice.
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Old Yesterday, 13:32   #27
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Re: Gaining Draught? Tanks Empty?

Quote:
Originally Posted by StuM View Post
What is "c/m" supposed to represent? (coulombs per metre? )
Wise ass.
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Old Yesterday, 15:42   #28
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Re: Gaining Draught? Tanks Empty?

The number you're after is called the "Pounds per inch immersion". The designer will know it, but you can calculate it yourself (see previous posts) if you can measure the waterline plane.
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Old Yesterday, 19:17   #29
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Re: Gaining Draught? Tanks Empty?

If you're on the hard now, why not just cut 200mm off the bottom of the keel? Launch, sail to new marina, haul out, re-attach keel piece, relaunch in deeper water.

I know, I know, the boat might fall over while sailing. So just motor....

Or convert to a wing keel...
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