[TheForge] Way off topic: boat dock

[Robert J Hill]

Grant,
The docks I've seen that were built with barrels as floats were tall 
and unstable.  How tall is the gunwale of your boat?  Wind and weather 
can pummel a boat pinched under a dock.  Foam would sit lower but it 
does get eaten up after a while.  A plastic barrel won't.  Maybe 
weighting it down the barrel with fresh water would help with 
stability.  Works on ships and such.
Rob

On Mar 28, 2008, at 21:45, Bob Ehrenberger wrote:

That seems counter intuitave. I may have to do some simulations with 
scale
models to verify the most stable configuration. It would be easier to 
build
if they are parallel to the dock.

Robert Ehrenberger
Shelbyville, Mo.
eforge at centurytel.net



----- Original Message -----
From: "Peter Hirst" <saltydog335 at aol.com>
To: "Bob Ehrenberger" <eforge at centurytel.net>; "Sponsored by ABANA"
<theforge at mailman.qth.net>
Sent: Friday, March 28, 2008 11:19 PM
Subject: Re: [TheForge] Way off topic: boat dock


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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