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From: <Bhansen97_at_aol.com>
subject: [Paddlewise] bulging and burping
Date: Fri, 17 Dec 1999 09:06:07 EST
<I've never had a problem with bulging hatches on my Romany - but I always
burp all of the hatches.  My husband (who also has a Romany) does have
bulging hatches.  He doesn't usually burp his hatches. >

Seems to me that would depend on whether air in the compartment could/would 
continue to expand or contract after the "burp". I'm sure I have seen hatches 
bulge or suck in after burping. 

For example - This happened day before yesterday - hatch covers sinking in, 
not bulging, this time. I'd been paddling in shallow water  which was colder 
than air temp. Hatch covers sank in a bit. When it was convenient I touched 
land, got out, burped the hatches. Paddled some more, out in deeper water 
where water was apparently colder. Hatches sank in again.

I'm sure no authority on this (or anything else), but I don't think I've ever 
seen water leak into a compartment as a result of VCP or KajakSport hatch 
covers sucking in or bulging, so the accounts of this happening have been of 
interest to me. For sure I've never seen a hatch cover pop off or ocmpletely 
implode from this sort of thing.

As for transporting the boat with hatch covers on as a couple of people have 
related, I was taught that's not a good idea so I (almost) always remove the 
covers even for a "ride" of a few blocks.

Bill Hansen
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From: <HTERVORT_at_aol.com>
subject: Re: [Paddlewise] bulging and burping
Date: Fri, 17 Dec 1999 10:46:39 EST
In a message dated 12/17/99 6:07:46 AM Pacific Standard Time, 
Bhansen97_at_aol.com writes:

> I don't think I've ever 
>  seen water leak into a compartment as a result of VCP or KajakSport hatch 
>  covers sucking in or bulging, so the accounts of this happening have been 
of 
> interest to me. 


I have.  I reproduced this effect some years ago when someone complained of 
water leakage in the rear of a VCP boat.  The round front hatch did not leak, 
but the oval rear hatch did.  I set the boat out in the sun and let it heat 
up, poured water into the channel around the bade of the covers, then cooled 
the boat with a combination of shade and water from the garden hose.  A very 
little water was sucked through the long sides of the oval hatch.  I'm don't 
recall, but I think it only happened when the hatch cover was fully sealed 
onto the opening rim, but not fully pressed down into the deck recess 
(double-sealed).

 
>  For sure I've never seen a hatch cover pop off or completely  
>  implode from this sort of thing.

I've never seen this, but there was a mention of it having happened to 
someone in a letter to one of the paddling magazines once.  The negative 
pressure can definitely make it much harder to remove the covers though.

Harold
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