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Medway Maniac View Drop Down
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Posts: 2788 		Post Options Post Options   Quote Medway Maniac Quote  Post ReplyReply Direct Link To This Post Topic: Breather Holes
    Posted: 27 Oct 06 at 10:27am
What diameter breather hole do people recommend, and where on the hull do you put it?
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 27 Oct 06 at 11:26am

Feel Free to look at mine on the 600 if you're down the club tomorrow. 

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JimC View Drop Down
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I usuallg glue in a bit of 2mm diameter polythene tubing and run it up the back of the front bulkhead and down again so part of it is out of the water in just about any position the boat will stay in.
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Iain C View Drop Down
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Posts: 1113 		Post Options Post Options   Quote Iain C Quote  Post ReplyReply Direct Link To This Post Posted: 28 Oct 06 at 12:08am
Silly question but why do you need one?  Is it to stop hull stresses due to temperature or similar?  For some reason my Fireball has pin-sized holes in all the tank hatches...cherub just leaks like a b**tard so no worris there!
RS700 GBR922 "Wirespeed"
Fireball GBR14474 "Eleven Parsecs"
Enterprise GBR21970
Bavaria 32 GBR4755L "Adastra"
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Medway Maniac View Drop Down
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Posts: 2788 		Post Options Post Options   Quote Medway Maniac Quote  Post ReplyReply Direct Link To This Post Posted: 28 Oct 06 at 2:01am

Yes, it's just for pressure equalisation. I recall that my 'ball had pin holes in the hatch covers too, but my new boat doesn't have any hatches!

I like Jim C's idea, but now the hull is built, it's a bit late for such sophistication!

My guess is that the tiniest of holes would do, but some I've seen are about 3mm (Laser's standard hole size on the L3k). I was wondering if there was some clever thinking behind that, but maybe that's just the drill size that came to hand...
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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: 28 Oct 06 at 6:28am
Originally posted by Iain C

Silly question but why do you need one?  Is it to stop hull stresses due to temperature or similar? 


Yep. Moths can suffer quite considerably on hot days, especially the old wood ones. I never bothered on my Cherub, even though it could build up quite a pressure differential in the floor tanks, owing to it being built like a brick [outhouse], but I did on the old singlehander and will if I build a 3mm ply canoe this winter...
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Posts: 511 		Post Options Post Options   Quote Worthy Quote  Post ReplyReply Direct Link To This Post Posted: 28 Oct 06 at 11:23am
Originally posted by Medway Maniac

Yes, it's just for pressure equalisation. I recall that my 'ball had pin holes in the hatch covers too, but my new boat doesn't have any hatches!



I have 2mm holes on my hatch covers too
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Prince Buster View Drop Down
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Posts: 1146 		Post Options Post Options   Quote Prince Buster Quote  Post ReplyReply Direct Link To This Post Posted: 28 Oct 06 at 11:47am
hang on.......a hole? in a boat??    I don't geddit
international moth - "what what?"
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Worthy View Drop Down
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Posts: 511 		Post Options Post Options   Quote Worthy Quote  Post ReplyReply Direct Link To This Post Posted: 28 Oct 06 at 12:14pm
Originally posted by Prince Buster

hang on.......a hole? in a boat??    I don't geddit


You know the theory of hot air expanding?

Well, if you don't have a breather hole then the air inside the hull will expand during the day and put pressure on the boat, possibly making it explode in extreme conditions (or at least put a leak in the boat).

The opposite is true at night time.

In short breather holes are essential
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Lukepiewalker View Drop Down
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Posts: 1341 		Post Options Post Options   Quote Lukepiewalker Quote  Post ReplyReply Direct Link To This Post Posted: 28 Oct 06 at 1:14pm
Look under the front of the toestrap in your laser.
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