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Old 23-06-2018, 23:52   #1
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Waterline trim ?

I am trying to keep waterline of the boat parallel to sea as current weight distribution makes boat float higher at the bow. Have noticed that many boats waterline actually leans forward so bows floats lower than sterns.

Is this on purpose?

See pic of mine, where stern is lower than bow.
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Old 24-06-2018, 02:28   #2
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Re: Waterline trim ?

Bum down causes more drag especially noticeable in light air sailing, especially with a hull designed for performance and efficiency. I imagine you'd motor in those conditions anyway, so not sure whether it would make any difference having fore-aft weight balance.


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Old 24-06-2018, 02:46   #3
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Re: Waterline trim ?

Very common with cruising cats - those engines, fuel tanks, large battery banks, generators, solar panels, dinghy etc all weighing down the stern make it very hard to level.


Monohulls don't tend to have the same amount of weight so far astern,and often carry water tanks and anchors/chain more forward that a multihull does - giving them the opposite problem.
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Old 24-06-2018, 13:31   #4
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Re: Waterline trim ?

thks for input.

Will fill my water tanks with extra 0.5 T of water. This should move fore-aft weight balance to right direction and see if any difference when sailing.
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Old 29-06-2018, 10:46   #5
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Re: Waterline trim ?

On cats, lighter is normally better so determining how to move weight around for passage has helped us: allowing crossings with less water weight.
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Old 13-07-2018, 13:28   #6
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Re: Waterline trim ?

It's faster with just the forward hulls in the water. Basically the less sterns in the better

On my cat's, Beach Cats, during some races I found that if I trapped out and moved forward of the front main beam during the upwind legs, I could point higher and sail faster

Here's the boat and you can see how far forward I had to get on the trapeze to do this...…..just forward of the front beam. We sailed singlehanded back then. My jib tell tale would be pointing straight up I was sailing so close to the wind

My boat was a couple rev levels before this one but about the same except for the wave piercing bows and new style daggerboards



This one has the lifting boards so they don't have to get so far forward

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Old 15-07-2018, 00:26   #7
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Re: Waterline trim ?

Quote:
Originally Posted by thomm225 View Post
It's faster with just the forward hulls in the water. Basically the less sterns in the better

On my cat's, Beach Cats, during some races I found that if I trapped out and moved forward of the front main beam during the upwind legs, I could point higher and sail faster

Here's the boat and you can see how far forward I had to get on the trapeze to do this.....just forward of the front beam. We sailed singlehanded back then. My jib tell tale would be pointing straight up I was sailing so close to the wind

My boat was a couple rev levels before this one but about the same except for the wave piercing bows and new style daggerboards



This one has the lifting boards so they don't have to get so far forward

excellent. Clip tells 1 million words !

Will think of weight distribution and try to rearrange. Adding 0.5T of water does not seem constructive. However, I like to sail more efficiently.
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Old 15-07-2018, 00:32   #8
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Re: Waterline trim ?

Quote:
Originally Posted by BigBeakie View Post
Bum down causes more drag especially noticeable in light air sailing, especially with a hull designed for performance and efficiency. I imagine you'd motor in those conditions anyway, so not sure whether it would make any difference having fore-aft weight balance.


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Just yesterday, sailing in flat water boat was happy doing 3 kn in 4 kn apparent with gennaker at 110 app. Felt just fine, actually was a bit surprised that gennaker did not collapse in such little wind. Did not feel need to motor as it went straight to target, but if i can get bit extra with weight distribution will not cry.
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Old 15-07-2018, 16:39   #9
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Re: Waterline trim ?

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Originally Posted by arsenelupiga View Post
excellent. Clip tells 1 million words !

Will think of weight distribution and try to rearrange. Adding 0.5T of water does not seem constructive. However, I like to sail more efficiently.
Great!

Some with large boats don't believe they can learn anything from the smaller and faster even though it's pretty obvious to most of us.

This is the version I used to race back in the early 2000's. It was a singlehanded boat with a main sail and spinnaker. (quite the hand full buoy racing)

No wave piercing hulls or lifting daggerboards (just straight 4' plus high aspect ratio boards) and the jib was optional. I bought the jib for distance races and I did great unless the wind got over say 15 knots and then I'd usually pitchpole at some point. I didn't have roller furling and plus we don't reef on racing beach cats

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