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Scooby_simon View Drop Down
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    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.

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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!

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mike ellis View Drop Down
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i didnt
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Posts: 7 		Post Options Post Options   Quote Kiteboy Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 06 at 6:58pm
wow you guys have really boring tech projects! im only doing GCSE and im making a carbon fibre kiteboard  if i used a compass id fill one in but i dont. youll get to the stage where you just make up results! everyone does
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Posts: 0 		Post Options Post Options   Quote Guest Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 06 at 5:33pm

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 ...
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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: 15 Nov 06 at 5:30pm
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.

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Posts: 126 		Post Options Post Options   Quote Adds Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 06 at 5:07pm
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.
Cheers Dudes
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lozza View Drop Down
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Posts: 262 		Post Options Post Options   Quote lozza Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 06 at 5:05pm

eliot, just pm'd you my response.
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mike ellis View Drop Down
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Posts: 2339 		Post Options Post Options   Quote mike ellis Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 06 at 4:34pm

good luck with your work, again an example of someone who got a more interesting project than me (gooddam puppet show muttermutter ). i dont have a compass so i cant fill in your survey though.

ahh i see A level, that might explain it.



Edited by mike ellis
600 732, will call it Sticks and Stones when i get round to it.
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Guest View Drop Down
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Posts: 0 		Post Options Post Options   Quote Guest Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 06 at 4:23pm

I fear you have a fundimental problem - if the compass is rotating it won't give you the heading of the boat in an accurate fashion ...

Rick
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