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Knee friendly Single Handers?

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The Moo View Drop Down
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Post Options Post Options   Quote The Moo Quote  Post ReplyReply Direct Link To This Post Topic: Knee friendly Single Handers?
    Posted: 27 Apr 15 at 10:49am
Tall self drainers were experimented with in the National 12 fleet a few years back. Apparently very comfortable to sail but no idea what they were like to recover from a capsize. From certain angles they were very aesthetically challenging to look at particularly at the bow.


Photo courtesy www.nat12.org
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JimC View Drop Down
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 15 at 9:45am
The centre tank will be a key part of the float low but come up reasonably dry concept, plus also gives something to sit on. A boat with a stern tank will tend to come up with much more water in and also accumulate much more water, plus you have a whole world of hassle with getting water through them to transom drains, and it leaves a huge amount of free surface for water to swish about on, making the boat unstable when swamped.

There's little more irritating than a double bottom that's too shallow, because water tends to come in when you tack and pool, especially in light airs with bow down trim, and you end up with some of the most irritating disadvantages of both self draining and non self draining.

Provided the centre tank isn't too wide to readily step over its not really going to be any more challenging than a centreboard to step over as soon as you are used to the boat.

Nothing's perfect, but there are some formidable advantages for that arrangement to set alongside the obvious disadvantages.
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Post Options Post Options   Quote gordon1277 Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 15 at 8:54am
Hi Keith
In the MK2 could you put a rear tank in as per John Turners Merlin and remove the trip hazard in the middle? Is it possible to have a deep double bottomed boat to keep it knee friendly? I would have thought its one or the other.
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Woodburner View Drop Down
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Post Options Post Options   Quote Woodburner Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 15 at 7:46pm
Nope, the Alto is a recent design but it sucks in that department, self balers are an anachronism in this day and age, sorry they're a deal breaker for me, one of the reasons I won't go near a Streaker that and its dagger, it was also the baler that contributed to my decision to give the Zero a drive by as well much as I loved it and it's manners, that thing would've eventually caused problems for me.

Edited by Woodburner - 25 Apr 15 at 7:48pm
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Post Options Post Options   Quote zippyRN Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 15 at 11:27am
Originally posted by The Moo

I seem to recall our old 505 didn't take much water on after a capsize and it wasn't self draining but had open transom ports which were very effective. A very comfortable boat too.

With a bit of design integrity, I am sure you can have the best of both worlds.

while is pretty much what JimC says above

I think the single bottom and  transom flaps model gets a bad press fro mthe  50s / 60s designs like that , that really did scoop up significant amounts of water on righting and  take an age to drain - especially stuff like a 'bag only' ent ...
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Do Different View Drop Down
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Post Options Post Options   Quote Do Different Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 15 at 10:25am
I wouldn't get too hung up on self drainers vs non self drainers. There have been good and bad examples of both, e.g. anyone remember those Wayfarer SDs? They could be exhausting; came up with a load of water on the false floor and the free surface water effect rolled them straight back over before you had a chance to get sorted.
That central tank on the Hadron is a neat arrangement with several benefits and not too many downsides I can see. Even crossing the boat shouldn't be too difficult, with some boom room I guess it's a stride rather than a shuffle. One plus I can see vs RS300, I remember sliding back through down to the low side when (not if) I missed my footing or was too slow, at least it will arrest progress the windward side of halfway Smile  
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PeterG View Drop Down
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Post Options Post Options   Quote PeterG Quote  Post ReplyReply Direct Link To This Post Posted: 24 Apr 15 at 9:20pm
Originally posted by boatshed

Originally posted by PeterG

Originally posted by Woodburner

How does the water drain back out after a capsize? Those infernal self baler things?

The reason I ask is, and it may be an optical illusion but it looks like he's standing up to his ankles in water at rest.


If you stand too far back in a stationary Contender water will come in the transom drains, but as soon as you start trimming the boat and moving it goes straight out - I'd imagine the same applies here.


Not quite.  A Contender is double bottomed and all of the water will drain out after a capsize.   Well, it did on mine.   .....

Agreed that the Contender is double bottomed, and that it is fully self draining after a capsize, but that in no way contradicts what I said - that if you stand in the back of a stationary Contender water will flow in via the transom drains (that may depend on how much you weigh, but I'm not a heavyweight or a Phantom sailor)! Not large amounts, but then the photo we are discussing doesn't show large amounts, I'll bet if the guy in the photo moved forward and powered up most, or all of that water would drain fairly quickly.
Peter
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The Moo View Drop Down
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Post Options Post Options   Quote The Moo Quote  Post ReplyReply Direct Link To This Post Posted: 24 Apr 15 at 9:15pm
I seem to recall our old 505 didn't take much water on after a capsize and it wasn't self draining but had open transom ports which were very effective. A very comfortable boat too.

With a bit of design integrity, I am sure you can have the best of both worlds.
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JimC View Drop Down
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 24 Apr 15 at 4:37pm
Every design is a compromise. Having no self draining capability means a lower floor and lets the boat float lower when on its side.

Edited by JimC - 24 Apr 15 at 4:38pm
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boatshed View Drop Down
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Post Options Post Options   Quote boatshed Quote  Post ReplyReply Direct Link To This Post Posted: 24 Apr 15 at 4:36pm
Originally posted by PeterG

Originally posted by Woodburner

How does the water drain back out after a capsize? Those infernal self baler things?

The reason I ask is, and it may be an optical illusion but it looks like he's standing up to his ankles in water at rest.


If you stand too far back in a stationary Contender water will come in the transom drains, but as soon as you start trimming the boat and moving it goes straight out - I'd imagine the same applies here.


Not quite.  A Contender is double bottomed and all of the water will drain out after a capsize.   Well, it did on mine.   The trouble with single bottom boats is if you are heavy and standing on the plate with the boat is on it's side it will scoop up a huge amount of water when it is rightend.  I'm guessing here but I think it would easy to get it deeper than ankle deep in the Hadron.

Saying that I like the look of the boat.   An unstayed carbon mast, a double bottom and a 60kg hull would be nice.    A more stable RS300 LOL
Steve
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