[TheForge] Way off topic: boat dock

[Peter Hirst]

You gotta think about the overall geometry, too.  Do a little research on 
primary and secondary stability of floating bodies. Two barrels side by side 
are very stable across their width, and very unstable end to end.  If the 
long axes of the barrels are perpendicular to the length of the dock, it 
will be very unstable side to side.  If you put them parallel to the length 
of the dock, you should be fine.

----- Original Message ----- 
From: "Bob Ehrenberger" <eforge at centurytel.net>
To: "Grant Marcoux" <gblacksmith at alamedanet.net>; "Sponsored by ABANA" 
<theforge at mailman.qth.net>
Sent: Friday, March 28, 2008 7:28 PM
Subject: Re: [TheForge] Way off topic: boat dock


> Grant,
>
> Thanks for the information.  I have been putting of building the dock for
> some 8 years. Just never seems to be any free time.  Then a couple months
> ago I was looking ar my resource pile and noticed a large frame that was
> originally industrial shelfing. It's 4' wide and about 15' long. The idea
> came to me that all I had to do was get enough flotation uder it and build 
> a
> deck and I was done.  In the time I have been thinking about this frame it
> came to me that I can simplify it even more by using wooden pallets for 
> the
> decking.  I can lift one end by myself so I think it is probably under 400
> pounds. For stability I was thinking of putting two barrels under each 
> end.
> The barrels will stick out past the edge of the dock and give it a bigger
> foot print.
>
> Robert Ehrenberger
> Shelbyville, Mo.
> eforge at centurytel.net
>
>
>
> ----- Original Message ----- 
> From: "Grant Marcoux" <gblacksmith at alamedanet.net>
> To: "Bob Ehrenberger" <eforge at centurytel.net>; "Sponsored by ABANA"
> <theforge at mailman.qth.net>
> Sent: Thursday, March 27, 2008 10:47 PM
> Subject: RE: [TheForge] Way off topic: boat dock
>
>
> Bob:  You can also get a very accurate idea by measuring the volume of 
> water
> displaced.  Detrmine cubic feet and multiply by 64.4 for fresh water.  In
> underwater lift problems, we calculated the volume of water we needed to
> displace when we chose our lift bags.
>
> You are right at 440 lbs, stability is another issue.
>
> Grant
>
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net
> [mailto:theforge-bounces at mailman.qth.net]On Behalf Of Bob Ehrenberger
> Sent: Thursday, March 27, 2008 8:35 PM
> To: theforge
> Subject: [TheForge] Way off topic: boat dock
>
>
> I'm planning on building a boat dock this summer and was wondering if any 
> of
> you knew how much flotation you get from a 55 gal drum?  I have several
> available but don't want to over kill it too bad if I can help it. The way 
> I
> figure it 55 gal of water would weigh 440 lbs so each drum should hold up
> 400 pounds. Does this sound right to you?
>
> Robert Ehrenberger
> Shelbyville, Mo.
> eforge at centurytel.net
>
>
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