03-24-2023, 09:00 PM | #11 | |
Join Date: Aug 2004
Location: Austin, TX
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Re: Gurps vehicles to design boats?
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Vehicles 2e doesn't really give you the tools to determine to determine that. I personally think that the sleekness and ratio of weight to flotation rating have something to do with it, but the interaction is fairly complex.
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03-24-2023, 10:23 PM | #12 | |
Join Date: Jan 2006
Location: Central Europe
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Re: Gurps vehicles to design boats?
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Estimating volume under the waterline at different loads for different hull shapes is really complicated, its probably 15 years since I nerded out about GURPS Vehicles so I can't comment on the realism of its ship drafts. I think the designer's notes for GURPS Classic Low Tech had some early Bill Stoddard tweaks.
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"It is easier to banish a habit of thought than a piece of knowledge." H. Beam Piper This forum got less aggravating when I started using the ignore feature Last edited by Polydamas; 03-24-2023 at 10:29 PM. |
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03-24-2023, 11:25 PM | #13 | ||
Join Date: Aug 2004
Location: Wellington, NZ
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Re: Gurps vehicles to design boats?
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Freeboard, as far as I can tell, is best calculated by taking the block the ship fits within, getting its length and width, and thus total height and subtracting draught from that height. This assumes that the body represents all of the ship's useful flotation, and that it's uppermost deck is reasonably flat and level, and thus some sailing ships don't have superstructures, because the gunwhales are high enough that they effectively make the forecastle and poop the upper level of the hull with the deck between as an open part of the ship's body.
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Rupert Boleyn "A pessimist is an optimist with a sense of history." |
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03-24-2023, 11:31 PM | #14 | |
Join Date: Aug 2004
Location: Wellington, NZ
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Re: Gurps vehicles to design boats?
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Stick to spaceships, they're simple.
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Rupert Boleyn "A pessimist is an optimist with a sense of history." |
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03-24-2023, 11:36 PM | #15 | |
Join Date: Jun 2005
Location: Lawrence, KS
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Re: Gurps vehicles to design boats?
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Bill Stoddard I don't think we're in Oz any more. |
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03-24-2023, 11:50 PM | #16 | |
Join Date: Aug 2004
Location: Wellington, NZ
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Re: Gurps vehicles to design boats?
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However, there's another way. Because it does give draught, and it does give flotation, we can get a rough idea by multiplying draught by flotation and dividing that by weight to give total height. Subtract draught from that to give freeboard. That shouldn't be too far off for most modern ships, and large age of sail ships, but will be less and less accurate for smaller and faster ships. It should also allow a guesstimate of length and beam, in conjunction with the length/beam ratios given for various lines.
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Rupert Boleyn "A pessimist is an optimist with a sense of history." |
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03-25-2023, 11:14 AM | #17 |
Join Date: Aug 2004
Location: Austin, TX
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Re: Gurps vehicles to design boats?
I think so, but that doesn't change the fact that losing 1' of freeboard isn't a big deal to the wooden board ship but turns the iron plate ship into a submarine.
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03-26-2023, 07:47 AM | #18 |
Join Date: Dec 2009
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Re: Gurps vehicles to design boats?
I have to admit, I’m confused as to what Ve2 actually does, but here is the bottom line…whatever it does do does it translate to mechanics in the game?
Also does it take into consideration of the five different points of sail to the wind? I think I might have to go back to school and get my engineering degree in boat design. LOL |
03-26-2023, 09:18 AM | #19 | |
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Join Date: Sep 2004
Location: Southeast NC
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Re: Gurps vehicles to design boats?
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Vehicles includes basic rules for sailing vessels, but if you want much detail, you will probably want to consider adding Vehicles Expansion 1
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RyanW - Actually one normal sized guy in three tiny trenchcoats. |
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03-26-2023, 10:13 AM | #20 | |
Join Date: Aug 2007
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Re: Gurps vehicles to design boats?
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You might also want the Gurps Vehicle Builder program to automate all the stuff.. http://www.sjgames.com/gurps/vehiclebuilder/ I'm afraid it's a fairly old program now but I beleive it still works.
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