Brian: I think you left out the fact that the gear and boat (even full of water) displace some water. So, just as a 200 lb person doesn't need 200/62.4=3.2 cu ft of life jacket, less foam would be needed. It would be interesting to know what that displacement is. --Gary On Feb 27, 2008, at 7:47 AM, brian gilbert wrote:
> Hi folks: > > I have a '78 M17... no foam floatation. Because of the displacement > (appx > 1550 lbs, plus, maybe, 450 lbs for a battery, motor, my not-so- > svelte self, > and misc gear), it would require a large amount of foam. > > How much? ( I'm doing this from memory, so I might not get it right, > but... > ) Water weighs about 64 lbs per cubic foot, so dividing 2000/64= 31 > cubic > feet of foam, BUT... that's the amount of foam needed to float her > on the > design waterline. If you filled the boat with foam, it'd probably > come to a > foot above the cabin sole. > > You don't need that much foam to float a swamped boat, but I believe > conventional practice is to use anywhere from 50-70% of that number. > (One of > my books says that reductions of 30-70 percent are possible.) So > you'd still > need 15 cu feet at minimum, and it would have to be distributed > correctly... > if you stuck it all under the V-berth, the boat might float, but it > also > might roll over with just the bow above water... not a good > situation in a > storm. > > That's why most larger, heavier boats don't have built-in > floatation... it > usually requires too much interior space to be practical. I suppose > it would > be possible to do it on a 17, 'cause there's plenty of dead space in > the > after end and some under the V-berth, but it would take a lot of > space. And > getting the calculation wrong might mean the difference in just barely > floating above water and sinking to the bottom VERY slowly. > > Best > BG > > -- > Brian Gilbert > Author, Fix It And Sail, The Complete Trailer-Sailor > Marine Media > 3404 Hartford Dr > Chattanooga, TN 37415 > www.sailingsmall.com > > From: [EMAIL PROTECTED] > Reply-To: [email protected] > Date: Wed, 27 Feb 2008 00:25:06 +0000 > To: [email protected] > Subject: montgomery_boats Digest, Vol 60, Issue 24 > > > Send montgomery_boats mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats > or, via email, send a message with subject or body 'help' to > [EMAIL PROTECTED] > > You can reach the person managing the list at > [EMAIL PROTECTED] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of montgomery_boats digest..." > > > Today's Topics: > > 1. Havasu Winter 2008 Event (Steve R.) > 2. Re: wet lockers (William Larson) > 3. Re: wet lockers ([EMAIL PROTECTED]) > 4. Re: wet lockers (Gary M Hyde) > 5. Re: wet lockers (Gary M Hyde) > 6. Interior of an M15 (W David Scobie) > 7. Re: montgomery_boats Digest, Vol 60, Issue 23 (Ben Smith) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 26 Feb 2008 16:35:29 -0800 > From: "Steve R." <[EMAIL PROTECTED]> > Subject: M_Boats: Havasu Winter 2008 Event > To: " For and about Montgomery Sailboats" > <[email protected]> > Cc: Sean <[EMAIL PROTECTED]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="UTF-8" > > We are back home and had a wonderful time on Lake Havasu. It was > nice to > meet the M-boaters, P-boaters and other boaters. I regret that some > were > not able to come and some could not get out on the water. You were > missed. > The weather was pleasant, although with little wind Saturday, and > often > times there were no other boats in sight. Sean and Jo were great > hosts. > Thanks for shuttling everyone around and organizing the event. > > steve > > Steve R. > M-15 #119 > Lexington, KY > > > > ------------------------------ > > Message: 2 > Date: Tue, 26 Feb 2008 16:37:47 -0800 (PST) > From: William Larson <[EMAIL PROTECTED]> > Subject: Re: M_Boats: wet lockers > To: For and about Montgomery Sailboats > <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=iso-8859-1 > > Dave: > You're right on the M17 - no foam floatation. I have tried on > occasion to > bury the lee rail on a beam reach without success. Perhaps no need > for the > foam flotation in that it's stiffer than M15? Maybe some of our > "seasoned" > skippers can chime in on this one. > Bill Larson M17 #632 > > W David Scobie <[EMAIL PROTECTED]> wrote: > ben: > > the M15 has 'positive flotation' in the form of foam blocks > installed at the > factory. the two foam locations are: under the cockpit floor, in the > bow (in > a screwed shut locker). > > the hull is solid fiberglass - not a floating sandwich like a > 'whaler. so > without the foam the M15 would sink. i have no idea what the 'lift > potential' is for a swamped M15. thing is ... i've never read that > an M15 > has been swamped - neither by accident or by design. > > i don't believe the M17 has positive flotation. i'll be corrected if > wrong > ;o)- > > in a short bit i'm going to post some interior shots of my M15. this > will > show the foam locations. the link will be shared on this email list. > > > dave scobie > M15 #288, not yet named > > > Ben Smith > wrote: > > So forgive me on the confusion but I don't yet own a Montgomery. Are > these > boats made with foam in them to give them buoyancy even if knocked > down > (like a Boston Whaler)? What is the extent of a Montgomery's reserve > buoyancy, what is installed at the factory? > > > Thanks, > Ben > > --------------------------------- > Looking for last minute shopping deals? Find them fast with Yahoo! > Search. > _______________________________________________ > http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats > > > > ------------------------------ > > Message: 3 > Date: Tue, 26 Feb 2008 19:44:04 EST > From: [EMAIL PROTECTED] > Subject: Re: M_Boats: wet lockers > To: [EMAIL PROTECTED], [email protected] > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="US-ASCII" > > As a new M-17 single-handing sailor planning some Chesapeake Bay > sailing > this > season, I'd also be interested in experiences of M-17 sailors in > unexpected > squalls, etc. Does a knock-down in an M-17 present a danger of > swamping? > Or > (assuming the lockers are secure) does it reliably self-right? Any > exciting > sea-stories from the old hands? > > Thanks > > Rick > M-17 #633 Lynne L > > > ************** > Ideas to please picky eaters. Watch video on > AOL Living. > > (http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-du > ffy/2050827?NCID=aolcmp00300000002598) > > > ------------------------------ > > Message: 4 > Date: Tue, 26 Feb 2008 19:35:33 -0800 > From: Gary M Hyde <[EMAIL PROTECTED]> > Subject: Re: M_Boats: wet lockers > To: For and about Montgomery Sailboats > <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes > > Dave: > I think you are right. The M15 is required to have floatation, about > 10 cubic feet if I remember what Jerry emailed me once. The M17 is in > a larger class and isn't required to have it. > --Gary > On Feb 26, 2008, at 4:11 PM, W David Scobie wrote: > >> ben: >> >> the M15 has 'positive flotation' in the form of foam blocks >> installed at the factory. the two foam locations are: under the >> cockpit floor, in the bow (in a screwed shut locker). >> >> the hull is solid fiberglass - not a floating sandwich like a >> 'whaler. so without the foam the M15 would sink. i have no idea >> what the 'lift potential' is for a swamped M15. thing is ... i've >> never read that an M15 has been swamped - neither by accident or by >> design. >> >> i don't believe the M17 has positive flotation. i'll be corrected >> if wrong ;o)- >> >> in a short bit i'm going to post some interior shots of my M15. >> this will show the foam locations. the link will be shared on this >> email list. >> >> >> dave scobie >> M15 #288, not yet named >> >> >> Ben Smith <[EMAIL PROTECTED]> wrote: >> >> So forgive me on the confusion but I don't yet own a Montgomery. Are >> these boats made with foam in them to give them buoyancy even if >> knocked down (like a Boston Whaler)? What is the extent of a >> Montgomery's reserve buoyancy, what is installed at the factory? >> >> >> Thanks, >> Ben >> >> --------------------------------- >> Looking for last minute shopping deals? Find them fast with Yahoo! >> Search. >> _______________________________________________ >> http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats > > > > > ------------------------------ > > Message: 5 > Date: Tue, 26 Feb 2008 19:40:40 -0800 > From: Gary M Hyde <[EMAIL PROTECTED]> > Subject: Re: M_Boats: wet lockers > To: For and about Montgomery Sailboats > <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes > > The second time out in my M17 when new I couldn't release the main > sheet in a jibe and shipped several gallons of water over the lee > gunwale and all around my buddy Vince! But not went into the cabin > even though the hatch boards were not in place. Vince had a change of > clothes along, so all ended well. > --Gary Hyde > 2005 M17 sailboat #637 'Hydeaway 2' > We can't change the wind, but we can trim our sails. Sailing is a bit > like "African Queening" thru life. > > On Feb 26, 2008, at 4:44 PM, [EMAIL PROTECTED] wrote: > >> As a new M-17 single-handing sailor planning some Chesapeake Bay >> sailing this >> season, I'd also be interested in experiences of M-17 sailors in >> unexpected >> squalls, etc. Does a knock-down in an M-17 present a danger of >> swamping? Or >> (assuming the lockers are secure) does it reliably self-right? Any >> exciting >> sea-stories from the old hands? >> >> Thanks >> >> Rick >> M-17 #633 Lynne L >> >> >> ************** >> Ideas to please picky eaters. Watch video on >> AOL Living. >> >> > (http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-du > ffy/2050827?NCID=aolcmp00300000002598 >> ) >> _______________________________________________ >> http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats > > > > > > > > > > ------------------------------ > > Message: 6 > Date: Tue, 26 Feb 2008 22:15:35 -0800 (PST) > From: W David Scobie <[EMAIL PROTECTED]> > Subject: M_Boats: Interior of an M15 > To: For and about Montgomery Sailboats > <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=iso-8859-1 > > Monty Fans: > > i've put together a short video slideshow that shows the interior > spaces of > an M15. > > http://s57.photobucket.com/albums/g203/spankmeairlines/M15number288/?action > =view¤t=6b150b28.pbr > > > individual slideshow images may be viewed through this link - > > http://s57.photobucket.com/albums/g203/spankmeairlines/M15number288/ > > NOTE - password required to view album (not the video slideshow). > the > password is: > > monty15fan > > the album images are not in any order (photobucket wouldn't allow me > to > 'organize' within an album). if you watch the slideshow you can see > the > approx name of each picture. in the image album you can review > details > about each photo. > > if anyone has a challenge let me know. i'll then work at getting a > different format for sharing these photos. > > > dave scobie > M15 #288 - not yet named > > > --------------------------------- > Be a better friend, newshound, and know-it-all with Yahoo! Mobile. > Try it > now. > > ------------------------------ > > Message: 7 > Date: Wed, 27 Feb 2008 07:25:03 +0000 > From: Ben Smith <[EMAIL PROTECTED]> > Subject: Re: M_Boats: montgomery_boats Digest, Vol 60, Issue 23 > To: <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="iso-8859-1" > > > Thanks Dave, Does anyone know if the 17s have "positive flotation" > blocks > installed? > Thanks, > Ben > > > > > > > > > ben: > > the M15 has 'positive flotation' in the form of foam blocks > installed at the > factory. the two foam locations are: under the cockpit floor, in the > bow (in > a screwed shut locker). > > the hull is solid fiberglass - not a floating sandwich like a > 'whaler. so > without the foam the M15 would sink. i have no idea what the 'lift > potential' is for a swamped M15. thing is ... i've never read that > an M15 > has been swamped - neither by accident or by design. > > i don't believe the M17 has positive flotation. i'll be corrected if > wrong > ;o)- > > in a short bit i'm going to post some interior shots of my M15. this > will > show the foam locations. the link will be shared on this email list. > > > dave scobie > M15 #288, not yet named > > > Ben Smith wrote: > > So forgive me on the confusion but I don't yet own a Montgomery. Are > these > boats made with foam in them to give them buoyancy even if knocked > down > (like a Boston Whaler)? What is the extent of a Montgomery's reserve > buoyancy, what is installed at the factory? > > > Thanks, > Ben > > --------------------------------- > _________________________________________________________________ > Climb to the top of the charts!?Play the word scramble challenge > with star > power. > http://club.live.com/star_shuffle.aspx?icid=starshuffle_wlmailtextlink_jan > > > ------------------------------ > > _______________________________________________ > montgomery_boats mailing list > [email protected] > http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats > > > End of montgomery_boats Digest, Vol 60, Issue 24 > ************************************************ > > > _______________________________________________ > http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
