Re: [bolger] Digest Number 261

thanks, Steve. I found it shortly after sending that e-mail. Sometimes I
can't find my glasses on my nose!!

As far as I know, no one has built a clam skiff with cabin. When I buy
plans from Bolger, I will ask him if anyone has built it.

george

bolger@egroups.comwrote:

> Bolger rules!!!
> - no cursing
> - stay on topic
> - use punctuation
> - add your comments at the TOP and SIGN your posts
> - add some content: send "thanks!" and "ditto!" posts off-list.
> ------------------------------------------------------------------------
>
> There are 3 messages in this issue.
>
> Topics in this digest:
>
> 1. Re: "Mostly Cabin" Boats
> From:shansen@...
> 2. Re: Blundered Pointy Skiff Near Completion
> From:sonicwonder@...
> 3. Re: Physics?
> From: "Ernie Murphy" <ernie@...>
>
> ________________________________________________________________________
> ________________________________________________________________________
>
> Message: 1
> Date: Thu, 02 Nov 2000 03:34:16 -0000
> From:shansen@...
> Subject: Re: "Mostly Cabin" Boats
>
> --- Inbolger@egroups.com, "George " <gmfulk@i...> wrote:
> > Steve,
> >
> > Did you scan in the photos of clam skiff with cabin? where are
> they?
> >
> > George
>
> George,
>
> I scanned it shortly after you requested it. A confirmation message
> was sent out when I uploaded it.
>
> It's currently the third item down in the Files menu. What's scanned
> are Bolger's drawings from the MAIB article.
>
> Steve Hansen
>
> ________________________________________________________________________
> ________________________________________________________________________
>
> Message: 2
> Date: Thu, 02 Nov 2000 04:24:36 -0000
> From:sonicwonder@...
> Subject: Re: Blundered Pointy Skiff Near Completion
>
> --- Inbolger@egroups.com, "Richard Spelling" <richard@s...> wrote:
> > Yes. Take pictures. Then take the boat out and bang it into the dock
> a
> > couple of times, drag it over some rocks, and throw some mud inside
> it.
> >
> > Then you can stop worrying about the perfect finish, and have fun!
> >
> > I'm pretty much at the same stage with my Larsboat. Has a nice
> pretty finish
> > on it, and I'm hesitating to take the boat out and USE it!
> >
> > Will take my own advice this weekend.
> >
>
> Hehe...Good to know someone else is in the same boat so to speak!
> Pictures are now up under the "Skiffy" folder. More to come soon ...
>
> ________________________________________________________________________
> ________________________________________________________________________
>
> Message: 3
> Date: Thu, 02 Nov 2000 09:47:09 -0000
> From: "Ernie Murphy" <ernie@...>
> Subject: Re: Physics?
>
> "a boat would behave the same whether ballasted with 500 lbs. of
> water, or 500 lbs of lead"
>
> Well, not true, let me see if I can give you a feel for this. I
> concidered this while imagineering a catfish, which has a water-
> filled keel.
>
> Imagine you have any boat, and start filling baloons with water,
> knotting the end and tying off with string. Weigh each baloon, then
> dump it overboard. Tie the string to the gunnel and do another. How
> many baloons will it take to sink your boat?
>
> Well, not *quite* an infinite ammount. After all, the string and
> even the baloon itself have some weight. But close.
>
> Now start doing the same with fishing sinkers that have the same
> weight as a water filled baloon. As long as the weights stay off the
> bottom they will start to pull your boat down as soon as you add the
> first one.
>
> Sure, 500 pounds of water and 500 pounds of lead both weigh 500
> pounds *in air*. Put em underwater and the water weighs.... zero,
> nada, nothing. Just remember: all boats float cause they weigh
> nothing.
>
> It's displacement you see. A 500 pound boat displaces an volumn of
> water that if you could scoop out and take out on land and weigh it
> would weigh... exactly 500 pounds. If the weight of water your boat
> displaced weighed any less, your boat would be sinking.
>
> (Water inside the boat isn't displaced. It may be out of place, but
> thats something different.)
>
> The lead will have weight underwater, as it is denser then the
> water. A thing is good for balast under water as long as it is denser
> then water, but only by the difference in it's weight and the weight
> of water it displaces.
>
> For my 'water keel' catfish, the water filling the keel still does
> a few useful things: It still has mass, hence it will help damp out
> movement (it will take more time for it to heel all the way over wet
> over dry), and also help carry it thru tacks. But, since underwater
> water "don't weigh nothing," it will not add to the righting moment
> till the boat heels to it's side and the keel comes out dry. And once
> outside it gets heavy FAST, helping to stop a rollover when it's
> getting disasterous.
>
> -Ernie
>
> --- Inbolger@egroups.com, "Bill Jochems" <wjochems@s...> wrote:
> > Estimado grupo Bolger
> > I have a question about something which is related, I think, to
> David
> > Ryan's question about 100 lbs. centered vs. 50 lbs. on each side.
> Bolger
> > has written that water ballast is of no effect until it has been
> lifted
> > above the water line. I don't understand this. It seems to me
> that weight
> > is weight, be it water, concrete or lead; and that a boat would
> behave the
> > same whether ballasted with 500 lbs. of water, or 500 lbs of lead,
> if the
> > centers of gravity of each were the same.
> > Bill Jochems
> > -----Original Message-----
> > From: David Ryan <david@c...>
> > To:bolger@egroups.com<bolger@egroups.com>
> > Date: Monday, October 30, 2000 10:17 AM
> > Subject: Re: [bolger] Physics?
> >
> >
> > >Hooray! Dr. Wah would be proud, even if he never did understand
> what
> > >I was doing in his class.
> > >
> > >Moving on.
> > >
> > >In a flat bottomed boat, is there a difference between putting 100#
> > >dead in the center of the center, or putting 50# on each chine?
> > >
> > >YIBB,
> > >
> > >David
> > >
> > >
> > >
> > >>That's about right. Let the weight of your 900# beam act in the
> middle;
> > the
> > >>lever arm is from fulcrum is then (15-3)=12', so the moment is
> > 12*900=10800
> > >>ft-lb. To balance the beam, you need to apply 10800/3 = 3600# on
> the
> > short
> > >>end (i.e. 3*3600=10800 => equilibrium).
> > >>
> > >>(To figure it much, much more simply, convert your units to SI
> metric,
> > >>divide by 1000 and then once again by .001 ;-)
> > >>
> > >>Gregg Carlson
> > >>
> > >>At 09:58 AM 10/30/2000 -0500, you wrote:
> > >>>FBBB --
> > >>>
> > >>>It's been 12 years since I cracked a physical text book (my
> degree is
> > >>>in fine art, go figure.)
> > >>>
> > >>>Anyone care to check me on this:
> > >>>
> > >>>A 30 foot beam that weighs 30 pounds per foot is balanced on a
> > >>>fulcrum 3 feet from one end (and 27 feet from the other.)
> > >>>
> > >>>By my (suspect) calculations, there is a torque of 10935 foot-
> pounds
> > >>>on one side, and 135 foot-pounds on the other.
> > >>>
> > >>>Further (dubious) arithmetic says that if I apply 3600 pounds of
> > >>>force directly on the end of the short side, the beam will be
> > >>>balanced.
> > >>>
> > >>>Anyone wanna check my math?
> > >>>
> > >>>YIBB,
> > >>>
> > >>>David
> > >>>
> > >>>
> > >>>CRUMBLING EMPIRE PRODUCTIONS
> > >>>134 W.26th St. 12th Floor
> > >>>New York, NY 10001
> > >>>(212) 243-1636
> > >>>
> > >>>
> > >>>Bolger rules!!!
> > >>>- no cursing
> > >>>- stay on topic
> > >>>- use punctuation
> > >>>- add your comments at the TOP and SIGN your posts
> > >>>- add some content: send "thanks!" and "ditto!" posts off-list.
> > >>>
> > >>>
> > >>
> > >>
> > >>
> > >>Bolger rules!!!
> > >>- no cursing
> > >>- stay on topic
> > >>- use punctuation
> > >>- add your comments at the TOP and SIGN your posts
> > >>- add some content: send "thanks!" and "ditto!" posts off-list.
> > >
> > >
> > >CRUMBLING EMPIRE PRODUCTIONS
> > >134 W.26th St. 12th Floor
> > >New York, NY 10001
> > >(212) 243-1636
> > >
> > >
> > >Bolger rules!!!
> > >- no cursing
> > >- stay on topic
> > >- use punctuation
> > >- add your comments at the TOP and SIGN your posts
> > >- add some content: send "thanks!" and "ditto!" posts off-list.
> > >
> > >
>
> ________________________________________________________________________
> ________________________________________________________________________