From: "Michael O'Flynn" <moflynn@sd23.bc.ca>
To: <baidarka@lists.intelenet.net>
Subject: Re: [baidarka] Gunwale height
Date: Mon, 20 Jul 1998 09:03:21 -0700
Hi Patrick.
ABS, as you may already know, is actually Acrylnitrile Butadiene Styrene (or
All Black Stuff, as some of my students are fond of calling it!)
You can get it in any plastic shop, and it comes in white and black. You
can use methylene chloride to glue it together (the fabricator's choice --
for speed), or you can simply use the yellow plumber's ABS solvent cement.
The former has an exciting MSDS, while the latter is probably just bad for
you. For my money, the yellow stuff is cheaper, but much thicker (when
you're trying to stick two pieces together by flooding liquid between them).
Putz showed using cardboard to make templates for the wood which would
become the coaming. I used the cardboard, then transferred that to 1/8"
ABS.
The coaming is simply 1/8" ABS with a top lip created from two pieces of
1/4" ABS glued together along the top edge. Imagine the letter "P". I
reinforced the corners (it's an old-fashioned coaming, to my mind) by using
small, bent pieces of ABS glued into the corners.
ABS is really easy to work with, as it is tough and not brittle. It bends
well with heat. Perhaps a heat gun would work with it -- I usually use an
oven or a home-made strip heater.
-----Original Message-----
From: Patrick Pierquet <ppierquet@teltech.com>
To: 'baidarka@lists.intelenet.net' <baidarka@lists.intelenet.net>
Date: Monday, July 20, 1998 8:35 AM
Subject: RE: [baidarka] Gunwale height
>Hi Michael - Can you elaborate on your ABS coaming??? Sounds like an
>interesting alternative!
>
>- Patrick Pierquet
>ppierquet@teltech.com
>
>> -----Original Message-----
>> From: Michael O'Flynn [SMTP:moflynn@sd23.bc.ca]
>> Sent: Saturday, July 18, 1998 11:30 PM
>> To: baidarka@lists.intelenet.net
>> Subject: Re: [baidarka] Gunwale height
>>
>> Hi Chris.
>>
>> My "Putz style" hit the water this past week with no ill effect.
>>
>> It is skinned in 3.7 oz aircraft dacron (Ceconite - it cost $72.00
>> Canadian
>> for more than enough to do the whole craft). The dacron was
>> surprisingly
>> easy to work with, almost no wrinkles at all, even before
>> heat-shrinking.
>> Small puckers at the top longitudinal seam make it look kinda
>> authentic
>> (IMHO)
>>
>> I coated it with Flecto Outdoor Diamond Finish. The 3.79 litre tin
>> ('merican gallon) was $60.00, and is enough to do 2 more 'yaks.
>>
>> The finish is water-based, and not designed for below the waterline,
>> but I
>> tested the stuff for several days submerged until I actually used it.
>> I put
>> on 5 coats (paranoia?), and it went well.
>>
>> The only toxicity issue I had is that I made my coaming out of ABS,
>> and the
>> solvent cement for it is deadly. I don't think I'll do it that way
>> again,
>> although it looks "bought".
>> -----Original Message-----
>> From: Chris Kohut <chriskayak@earthlink.net>
>> To: baidarka@lists.intelenet.net <baidarka@lists.intelenet.net>
>> Date: Thursday, July 16, 1998 4:50 PM
>> Subject: Re: [baidarka] Gunwale height
>>
>>
>> >At the risk of inspiring incendiary missives, (INCOMMING!!!!) might
>> I ask,
>> if
>> >there are skinning materials such as nylon out there,(which I found
>> to be
>> >fairly easy to work with), what are the properties and advantages of
>> choosing
>> >#10 canvas? Or are there better skinning materials than the two
>> mentioned?
>> >Or is this part of the great Vanilla/Chocolate debate?
>> > Chris
>> >David Baranoski wrote:
>> >
>> >> On Thu, 16 Jul 1998, Wolfgang Brinck wrote:
>> >>
>> >> > I have built baidarkas using white pine for gunwales (1.75") and
>> none
>> of
>> >> > them has broken, but I think white pine is less elastic than some
>> other
>> >> > woods and in time can take a set or warp more easily than stiffer
>> more
>> >> > elastic lumber species.
>> >> >
>> >> > An extra quarter inch (2" gunwale) should be sufficient since
>> stiffness
>> >> > goes up with the cube of the height - if you do the math, you
>> will find
>> >> > that adding a quarter inch will increase stiffness by 50%, adding
>> 1/8th
>> >> > inch will increase stiffness by 22%, so have at it.
>> >> >
>> >>
>> >> Wolfgang,
>> >>
>> >> I'll go ahead with using 2 inches for the gunwales. Lake Ontario
>> can get
>> >> up there sometimes, and the white pine/stiffness question hit my
>> paranoia
>> >> button. I'll sleep better at night now. I think I'll stay away from
>> the
>> >> archives for a while...just sourced a local supplier of #10 canvas
>> duck,
>> >> and I don't want to see that you've been advocating nylon :)
>> >>
>> >> Thanks for the reply; and I'll apologize for getting your book a
>> little
>> >> dog-eared.
>> >>
>> >> David Baranoski
>> >> Thorold, Ontario
>> >> Canada
>> >
>> >
>> >