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G.R.F. View Drop Down
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Posts: 4028 		Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Topic: V Twin
    Posted: 20 Jan 11 at 9:17am
Originally posted by JimC

The wetted surface pictures are all very well, but as soon as the boat has any speed on won't they be entirely misleading? The bow and stern wave systems are going to have a big impact on what is immersed.

Yes of course, and hopefully quite dramatically, there's way too great a wetted surface area as it stands. But the illustration also indicates the rocker is working.

I gather (I'm no expert on these new fangled programmes) it provides an indicator for drag coeffient in displacement style yotting, but it is a great aid nonetheless, so when we tweak the angles it should show positive or negative values.

I imagine it works fantastically on a proper traditional boat, this thing is a bit left field, but without these illustrations that it 'theoretically' will work, I don't think the boys would be very keen to let me go ahead and waste their time.
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getafix View Drop Down
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Posts: 2143 		Post Options Post Options   Quote getafix Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 11 at 1:48pm
Appluading the effort and yes, while it's nice to get a flavour for where you're going, I can't help thinking this is a little like trying to be West Ham manager from a designers point-of-view.  You come up with some prelim renders and numbers and they get splashed on a forum for all and sundry to comment on...... but, hey, makes interesting enough reading
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G.R.F. View Drop Down
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Posts: 4028 		Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 11 at 3:21pm
Now you have got me, West Ham? W.T.F is that? Some sort of none communist bloc pig cured and smoked?

Why would anyone have any management or design issues about that?

 You're going to have to enlighten the ensemble about that analogy, as for the boat it is going to be built and I'm going to sail it.

I've just by co-incidence had another brilliant brain wave about those removable hiking benches, blindingly simple, comfortable as an armchair by co-incidence and super light... Make em inflatable!.
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ifoxwell View Drop Down
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Posts: 669 		Post Options Post Options   Quote ifoxwell Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 11 at 3:25pm
Originally posted by I luv Wight

Here's one I did earlier for Graeme  ( exactly a year ago!)


  

Medway Maniac and I had an online conversation recently about a hull with lines like this one. He kind of talked me out of it but i still think that this has something going for it.

Ian
RS300
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WoodenBoatLuvver View Drop Down
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Posts: 40 		Post Options Post Options   Quote WoodenBoatLuvver Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 11 at 4:27pm


    • Edited by WoodenBoatLuvver - 22 Jan 11 at 6:12pm
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    G.R.F. View Drop Down
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    Posts: 4028     		Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 11 at 5:13pm
    Originally posted by WoodenBoatLuvver

    West Pigham, always blowing bubbles, set off any alarm bells, and their pseudonim Hammers, metaphorical use for one of those eh, in return for all those cruel matches, (jibes) about kindling wood going to waste as to wasting on Cryclassic restorations Wink

    Haven't quite clocked who you are old chap, but found somewhere that could help you..
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    RS400atC View Drop Down
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    Posts: 3011     		Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 11 at 5:22pm
    All this heeled water plane stuff might work OK steady state going up wind in flat water, but what happens in waves, even small ones?
    What happens down wind?
    What happens when you tack and change 'hulls'? The new hull will be presented at an angle to the flow as it comes into the water.
    Anytime both 'hulls' are in the water, drag will be gross as they are trying to travel in different directions.
    Why not just have a cat of the desired width and try to address the manoeuvrability some other way?

    And it looks like  cross between a rubbish barge and a zapcat, without the purposeful nature of either.
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    WoodenBoatLuvver View Drop Down
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    Posts: 40     		Post Options Post Options   Quote WoodenBoatLuvver Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 11 at 5:31pm
    [/QUOTE] Well I think we twigged your real personna old boy



    Edited by WoodenBoatLuvver - 25 Jan 11 at 7:34pm
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    Guests View Drop Down
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    		Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 11 at 6:30pm
    Oi James!   I know I'm not the only one from Thanet on here!
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    JimC View Drop Down
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    Posts: 6662     		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 11 at 6:44pm
    Originally posted by RS400atC

    What happens...

    This is all the sort of stuff you have to think through at this sort of stage. Its always vey easy to come up with reasons why the new and radical won't work, but if you can work your way through all of them on paper then it may be that something useful comes out of it. One thing is for sure, if you give up at the first difficulty you won't innovate anything.

    The major challenges to making this concept work are going to include wave impact and wetted area, and I'm sure the folks working on this don't need me to tell them that. Are they insuperable problems? Well, you're only going to find out with some serious work: a 30 seconds knee jerk forum response from me will be of no value at all so I don't intend to make one. I shall attempt to keep my mouth shut unless/until I spend enough time thinking through the issues to have a halfway informed opinion.

    As for appearance: well the observation that what you're used to looks good is not a new one. I'm pretty sure that I have seen somewhere a book from the 1930s where the author is saying that OK, we all think the J class look ugly now, but you may find they grow on you...
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