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questionnaire for a-level D.T
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craig-m View Drop Down
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Posts: 34 		Post Options Post Options   Quote craig-m Quote  Post ReplyReply Direct Link To This Post Topic: questionnaire for a-level D.T
    Posted: 15 Nov 06 at 8:01pm

Originally posted by Kiteboy

youll get to the stage where you just make up results! everyone does

I'm doing GRAPHIC PRODUCTS at GCSE, and i had to do exactly that. I couldn't get to the sailing club to ask sailors, and nobody else knew what the product was! Still...teacher didn't know the dfference!

RS300 406DERBYSHIRE YOUTH SAILING
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Scooby_simon View Drop Down
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Posts: 2415 		Post Options Post Options   Quote Scooby_simon Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 06 at 8:06pm
Originally posted by Guest#260

Originally posted by JimC

Originally posted by Adds

I agree with Rick if the boom is going in and out how is it going to get the correct bearing, unless you spend £399 on a tacktick mast rotation sensor.


No doubt that's the design element of his project, but one obvious way of doing it is to have a mechanical linkage so that the compass housing turns on the boom exactly in synch with the boom turning on the gooseneck. That would only work for non-rotating masts though: with a rotating mast the linkage would have to be relative to the deck so it would be more complicated to rig but still possible.

It would have to be a pretty tight bit of engineering not to suffer from slop as the boom moves quite a bit.

How about using an electronic compass and seperating the display from the sensor - I think Nigel Buckley did this on his 470 in th 80's ...

 

Yep,. that might work - The problem would be even worse on Cats as the mast also rotates.

Wanna learn to Ski - PM me..
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olly_love View Drop Down
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Posts: 1145 		Post Options Post Options   Quote olly_love Quote  Post ReplyReply Direct Link To This Post Posted: 16 Nov 06 at 11:28am

i made all of mine up. the project turned out fine and the spadle will be out soon on the market so keep an eye out for it.

oh and haveing the compas mounted to the boom with a gearing it wouldnt work well cause the boom is always moving cause of sheeting.  prehaps if u made a compas that has more than one dial on it but that would have sheilding probs

anyway keep going and just steel ideas
TWO FRANK-Hunter Impala


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Posts: 78 		Post Options Post Options   Quote BigFatStan Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 06 at 10:40am
Put the sensor somewhere fixed (anywhere in the boat basically) connect to the display by wire or wireless. Not difficult
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Posts: 78 		Post Options Post Options   Quote BigFatStan Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 06 at 10:42am
But I still think it addresses a problem that doesn't exist - how many people have problems seeing their tacktick?
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Posts: 78 		Post Options Post Options   Quote BigFatStan Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 06 at 10:50am
But I still think it addresses a problem that doesn't exist - how many people have problems seeing their tacktick?
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English Dave View Drop Down
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Posts: 682 		Post Options Post Options   Quote English Dave Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 06 at 11:21am

It would still be easier to read on the boom!

How about a GPS compass? That would measure your true heading rather than the direction the boat is pointing in and would ignore the angle of the boom. You'd have to be moving though.
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(You'd think I'd be better at it by now)

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BigFatStan View Drop Down
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Posts: 78 		Post Options Post Options   Quote BigFatStan Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 06 at 1:39pm
I'm not convinced it would be better on the boom - I don't spend much time looking at that when I am going upwind (which is presumably when the compass is most used) but I do spend most of the time looking past the mast.
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49erGBR735HSC View Drop Down
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Posts: 1991 		Post Options Post Options   Quote 49erGBR735HSC Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 06 at 1:55pm
For the cats with rotating masts, wouldn't the ideal be to make a bracket which comes back from the mast step, a bit like the one on the 49ers and have the compass mounted solidly to the bracket which is mounted independantly to the mast. Have a look at http://www.ruleone.co.uk/compass_shop.html for details on the 49er mount and it may be just a case of modifying the design for a cat application (if there is a case for any modification or else it may be back to the drawing board for other ideas).
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Adds View Drop Down
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Posts: 126 		Post Options Post Options   Quote Adds Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 06 at 2:01pm
Stan makes a good point it is very easy to see the tacktick, if anything you want it further forwards not back. It is not quick to have your eyes in the boat, ie looking at the boom.
Cheers Dudes
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