Re: Sharpie Cat design
Enjoy sky, mountain, ice, forest, water, Bolger boats. Beautiful.
Graeme.
Graeme.
--- Inbolger@yahoogroups.com, Harry James <welshman@p...> wrote:
> If you haven't checked out the Zeiger's home page in a while,
there are
> many fine pictures of a Martha Jane in action.
>
>http://www.alaska.net/~mzeiger/MJ.html
>
> Through out the site you will see many pictures of why shallow
draft is
> neat no matter where you are. I particularly like the scene in
the
> summer 2003 section where they are all up a creek on Admiralty
Island.
> About as much Bolger content as you can get in one scene, Martha
Jane ,
> Modified AS29, dinghy's consisting of Nymph, Light Dory and June
Bug.
>
> HJ
The K24looks interesting, thanks HJ. Probably more seaworthy with
the Hobie 16 or 18 rig. TFJones 22'6"x14' Night Heron seems
similar. Less capacity, and maybe cheaper all up.
Graeme
the Hobie 16 or 18 rig. TFJones 22'6"x14' Night Heron seems
similar. Less capacity, and maybe cheaper all up.
Graeme
--- Inbolger@yahoogroups.com, Harry James <welshman@p...> wrote:
> Check out
>
>http://www.prcn.org/kismet/k24t.htm
>
> Simple boat, trailerable (though not easy),
>
> HJ
>
So true.
Graeme
-- Inbolger@yahoogroups.com, Harry James <welshman@p...> wrote:
Graeme
-- Inbolger@yahoogroups.com, Harry James <welshman@p...> wrote:
> I don't think that trailer boats are really that easy especiallyat the
> small cruiser size. Martha Jane is certainly easier than some withthe
> tabernacle mast. I know that Mark Zeiger only has to drive about 4-6
> miles to launch his Martha Jane yet he leaves it on a mooring allsummer.
>makes it
> I think that any thing much past 16' or so has an inertia that
> hard to get up and head to the water with. You don't have theimpulse
> trip when the weather beckons, it has to be well planned inadvance.
>
> HJ
>
> Philip Smith wrote:
>
> >If you want something quick to trail and launch and
> >you haven't got your heart set on a cat, consider the
> >Martha Jane, especially as modified.
> >
> >
> >
> >
Thanks for the link Peter.It's a while since I visited the Woods
site. I'm really taken with the claimed 20 minute launching
procedure, less so by an estimated 2000 costing of ~Aus$12000 plus.
IRC, not long ago there was an article in Australian Amateur
Boatbuilder by someone who built Wizard well, and over time
economically. At least they were very happy with the
boat,performance, and more so with its prospective resale value.
Graeme
--- Inbolger@yahoogroups.com, "pvanderwaart" <pvanderwaart@y...>
wrote:
site. I'm really taken with the claimed 20 minute launching
procedure, less so by an estimated 2000 costing of ~Aus$12000 plus.
IRC, not long ago there was an article in Australian Amateur
Boatbuilder by someone who built Wizard well, and over time
economically. At least they were very happy with the
boat,performance, and more so with its prospective resale value.
Graeme
--- Inbolger@yahoogroups.com, "pvanderwaart" <pvanderwaart@y...>
wrote:
>
> Also check out the Woods Janus, and especially, the Wizard.
>
>http://www.sailingcatamarans.com/
>
> Peter
... and for several of the designs there are examples already built.
It took me a moment to work out the site's non-standard way of
linking to other pages -- by clicking on the buttons (although the
instructions are right there on the page). There are lots of nice
photos.
Howard
--- Inbolger@yahoogroups.com, "pvanderwaart" <pvanderwaart@y...>
wrote:
It took me a moment to work out the site's non-standard way of
linking to other pages -- by clicking on the buttons (although the
instructions are right there on the page). There are lots of nice
photos.
Howard
--- Inbolger@yahoogroups.com, "pvanderwaart" <pvanderwaart@y...>
wrote:
>
> Also check out the Woods Janus, and especially, the Wizard.
>
>http://www.sailingcatamarans.com/
>
> Peter
Hi John. Yes I've looked at Tiki 21. It's a great boat. Although its
trailerable the only drawback is that you can't just back it down
the boatramp and take off. I sometimes bay cruise a 14'x 8'
fibreglass Caper Cat( people have cruised these three-up from North
Queensland to PNG). Less sporty than a Hobie, with good in-hull
storage too, but still a bit too overpowered to fit Wharram's idea
of a safe cruising cat. I like cat cruising - settle back, ease
sheets, and if there is any wind at all you pass nearly everything
without the fuss.
Only the thing is, you are exposed, perched on the bridgedeck all
the time. Tenting is possible, but it's inconvenient with stores
tucked away in the holds. I'd like some kind of little cabin. I'd
probably still mostly sleep on the bridgedeck at anchor or hove-to,
but the cabin(s) would give better shelter when needed, and would be
so much better for making coffee and meals while on the go.
Wharram had a trailerable 16'x8' permanently assembled, seaworthy,
Maui cat. I thought about adapting that, but could not really see it
working.
Thomas Firth Jones has Weekender. It won a design contest judged by
our hero Phil Bolger. It looks complicated and needs a special
trailer built. It would certainly trail and launch easily, but is
for sheltered waters.
Graeme
trailerable the only drawback is that you can't just back it down
the boatramp and take off. I sometimes bay cruise a 14'x 8'
fibreglass Caper Cat( people have cruised these three-up from North
Queensland to PNG). Less sporty than a Hobie, with good in-hull
storage too, but still a bit too overpowered to fit Wharram's idea
of a safe cruising cat. I like cat cruising - settle back, ease
sheets, and if there is any wind at all you pass nearly everything
without the fuss.
Only the thing is, you are exposed, perched on the bridgedeck all
the time. Tenting is possible, but it's inconvenient with stores
tucked away in the holds. I'd like some kind of little cabin. I'd
probably still mostly sleep on the bridgedeck at anchor or hove-to,
but the cabin(s) would give better shelter when needed, and would be
so much better for making coffee and meals while on the go.
Wharram had a trailerable 16'x8' permanently assembled, seaworthy,
Maui cat. I thought about adapting that, but could not really see it
working.
Thomas Firth Jones has Weekender. It won a design contest judged by
our hero Phil Bolger. It looks complicated and needs a special
trailer built. It would certainly trail and launch easily, but is
for sheltered waters.
Graeme
--- Inbolger@yahoogroups.com, "John Spoering" <spoering@e...> wrote:
> Hi Graeme - Just a thought - have you looked into James
Warrams Tiki 21
> catamaran ? I had the pleasure of building the first one in the
USA and
> it only took me 6 months of spare time in the back yard,
Accomadations are
> more than adequate for 2 and she's a great sailer inshore and
off. Check
> out the James Warram web site thru Google or Yahoo.
> Aloha - Jack
Spoering - Ft Lauderdale, Fl
>
>
> > [Original Message]
> > From: graeme19121984 <graeme19121984@y...>
> > To: <bolger@yahoogroups.com>
> > Date: 12/12/2004 7:14:03 PM
> > Subject: [bolger] Re: Sharpie Cat design
> >
> >
> >
> > I like the Martha Jane, and I've seen one marvelously modified
by a
> > guy who lives aboard and cruises Tasmania to PNG full time. To
fit
> > the kind of messing-about requirements I have in mind, compact,
> > quick to get in the water and relatively fast on the water, I
> > thought a multihull of some kind would fit the bill, short of
going
> > to a planing powerboat. Whereas MJ would out score my old Micro,
at
> > 23'6" she is fairly big. If I went from 16' to over 20'in a cat
I'd
> > certainly have the speed and spartan accomodation, but again
it's a
> > relatively big project still without the trailing and rigging
> > complete solutions.
> >
> > Mr bolger wrote me saying that H&H Schooner at US$100 was an
> > excellent boat if the comparatively deep keel were acceptable.
There
> > are some shallows where I might go and I wonder at the
practicality
> > of raising H&Hs dagger board, and though very beautiful the
sailplan
> > may take too much time too rig. H&H would be great fun for
longer
> > deep water bay, or offshore cruises. (Sooner or later these
boats
> > would be trailed to Great Barrier Reef waters and I worry about
> > speeding in the trades over isolated emergent coral bombies :-(
> >
> > I've no experience with trimarans, but can see the main hull
might
> > allow accomodation as it can have more beam than a
catamarans.Maybe
> > a sharpie hull? Also the lighter side floats should make the
package
> > easier to configure for trailing. Mr Bolger answered my query
about
> > the camping trimaran 'Beach Cruiser' #554 for US$100 as being a
> > design for a hull (sharpie?) using Hobie 16 floats, rig, and
> > hardware. I don't know much about it and would love to see a
picture
> > or drawing. Could it be built without the Hobie hulls, out of
ply?
> > Does it easily trail, rig, launch? Fast?
> >
> > ( I've said before some kind of out-rigger sailing canoe / proa
> > could be the way to go. At an L/B approaching 6.5 what about a
> > partially decked and out-riggered Zephyr? 'Gizmo'(L/B~12) , Jim
> > Michalak's take on PCB's 'Minimum Proa' seems do-able but
> > accomodation within raised topsides would be very tight.)
> > Graeme
> >
> >
> > --- Inbolger@yahoogroups.com, Philip Smith <pbs@w...> wrote:
> > > If you want something quick to trail and launch and
> > > you haven't got your heart set on a cat, consider the
> > > Martha Jane, especially as modified.
> >
> >
> >
> >
> >
> >
> > Bolger rules!!!
> > - no cursing, flaming, trolling, spamming, or flogging dead
horses
> > - stay on topic, stay on thread, punctuate, no 'Ed, thanks,
Fred' posts
> > - Pls add your comments at the TOP, SIGN your posts, and snip
away
> > - Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax:
> (978) 282-1349
> > - Unsubscribe:bolger-unsubscribe@yahoogroups.com
> > - Open discussion: bolger_coffee_lounge-
subscribe@yahoogroups.com
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
Check out
http://www.prcn.org/kismet/k24t.htm
Simple boat, trailerable (though not easy),
HJ
graeme19121984 wrote:
http://www.prcn.org/kismet/k24t.htm
Simple boat, trailerable (though not easy),
HJ
graeme19121984 wrote:
>I like the Martha Jane, and I've seen one marvelously modified by a
>guy who lives aboard and cruises Tasmania to PNG full time. To fit
>the kind of messing-about requirements I have in mind, compact,
>quick to get in the water and relatively fast on the water, I
>thought a multihull of some kind would fit the bill, short of going
>to a planing powerboat. Whereas MJ would out score my old Micro, at
>23'6" she is fairly big. If I went from 16' to over 20'in a cat I'd
>certainly have the speed and spartan accomodation, but again it's a
>relatively big project still without the trailing and rigging
>complete solutions.
>
>Mr bolger wrote me saying that H&H Schooner at US$100 was an
>excellent boat if the comparatively deep keel were acceptable. There
>are some shallows where I might go and I wonder at the practicality
>of raising H&Hs dagger board, and though very beautiful the sailplan
>may take too much time too rig. H&H would be great fun for longer
>deep water bay, or offshore cruises. (Sooner or later these boats
>would be trailed to Great Barrier Reef waters and I worry about
>speeding in the trades over isolated emergent coral bombies :-(
>
>I've no experience with trimarans, but can see the main hull might
>allow accomodation as it can have more beam than a catamarans.Maybe
>a sharpie hull? Also the lighter side floats should make the package
>easier to configure for trailing. Mr Bolger answered my query about
>the camping trimaran 'Beach Cruiser' #554 for US$100 as being a
>design for a hull (sharpie?) using Hobie 16 floats, rig, and
>hardware. I don't know much about it and would love to see a picture
>or drawing. Could it be built without the Hobie hulls, out of ply?
>Does it easily trail, rig, launch? Fast?
>
>( I've said before some kind of out-rigger sailing canoe / proa
>could be the way to go. At an L/B approaching 6.5 what about a
>partially decked and out-riggered Zephyr? 'Gizmo'(L/B~12) , Jim
>Michalak's take on PCB's 'Minimum Proa' seems do-able but
>accomodation within raised topsides would be very tight.)
>Graeme
>
>
>--- Inbolger@yahoogroups.com, Philip Smith <pbs@w...> wrote:
>
>
>>If you want something quick to trail and launch and
>>you haven't got your heart set on a cat, consider the
>>Martha Jane, especially as modified.
>>
>>
>
>
>
>
>
>
>Bolger rules!!!
>- no cursing, flaming, trolling, spamming, or flogging dead horses
>- stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
>- Pls add your comments at the TOP, SIGN your posts, and snip away
>- Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax: (978) 282-1349
>- Unsubscribe:bolger-unsubscribe@yahoogroups.com
>- Open discussion:bolger_coffee_lounge-subscribe@yahoogroups.com
>Yahoo! Groups Links
>
>
>
>
>
>
>
>.
>
>
>
If you haven't checked out the Zeiger's home page in a while, there are
many fine pictures of a Martha Jane in action.
http://www.alaska.net/~mzeiger/MJ.html
Through out the site you will see many pictures of why shallow draft is
neat no matter where you are. I particularly like the scene in the
summer 2003 section where they are all up a creek on Admiralty Island.
About as much Bolger content as you can get in one scene, Martha Jane ,
Modified AS29, dinghy's consisting of Nymph, Light Dory and June Bug.
HJ
Philip Smith wrote:
many fine pictures of a Martha Jane in action.
http://www.alaska.net/~mzeiger/MJ.html
Through out the site you will see many pictures of why shallow draft is
neat no matter where you are. I particularly like the scene in the
summer 2003 section where they are all up a creek on Admiralty Island.
About as much Bolger content as you can get in one scene, Martha Jane ,
Modified AS29, dinghy's consisting of Nymph, Light Dory and June Bug.
HJ
Philip Smith wrote:
>If you want something quick to trail and launch and
>you haven't got your heart set on a cat, consider the
>Martha Jane, especially as modified.
>
>
>
>
I don't think that trailer boats are really that easy especially at the
small cruiser size. Martha Jane is certainly easier than some with the
tabernacle mast. I know that Mark Zeiger only has to drive about 4-6
miles to launch his Martha Jane yet he leaves it on a mooring all summer.
I think that any thing much past 16' or so has an inertia that makes it
hard to get up and head to the water with. You don't have the impulse
trip when the weather beckons, it has to be well planned in advance.
HJ
Philip Smith wrote:
small cruiser size. Martha Jane is certainly easier than some with the
tabernacle mast. I know that Mark Zeiger only has to drive about 4-6
miles to launch his Martha Jane yet he leaves it on a mooring all summer.
I think that any thing much past 16' or so has an inertia that makes it
hard to get up and head to the water with. You don't have the impulse
trip when the weather beckons, it has to be well planned in advance.
HJ
Philip Smith wrote:
>If you want something quick to trail and launch and
>you haven't got your heart set on a cat, consider the
>Martha Jane, especially as modified.
>
>
>
>
Hi Graeme - Just a thought - have you looked into James Warrams Tiki 21
catamaran ? I had the pleasure of building the first one in the USA and
it only took me 6 months of spare time in the back yard, Accomadations are
more than adequate for 2 and she's a great sailer inshore and off. Check
out the James Warram web site thru Google or Yahoo.
Aloha - Jack Spoering - Ft Lauderdale, Fl
catamaran ? I had the pleasure of building the first one in the USA and
it only took me 6 months of spare time in the back yard, Accomadations are
more than adequate for 2 and she's a great sailer inshore and off. Check
out the James Warram web site thru Google or Yahoo.
Aloha - Jack Spoering - Ft Lauderdale, Fl
> [Original Message](978) 282-1349
> From: graeme19121984 <graeme19121984@...>
> To: <bolger@yahoogroups.com>
> Date: 12/12/2004 7:14:03 PM
> Subject: [bolger] Re: Sharpie Cat design
>
>
>
> I like the Martha Jane, and I've seen one marvelously modified by a
> guy who lives aboard and cruises Tasmania to PNG full time. To fit
> the kind of messing-about requirements I have in mind, compact,
> quick to get in the water and relatively fast on the water, I
> thought a multihull of some kind would fit the bill, short of going
> to a planing powerboat. Whereas MJ would out score my old Micro, at
> 23'6" she is fairly big. If I went from 16' to over 20'in a cat I'd
> certainly have the speed and spartan accomodation, but again it's a
> relatively big project still without the trailing and rigging
> complete solutions.
>
> Mr bolger wrote me saying that H&H Schooner at US$100 was an
> excellent boat if the comparatively deep keel were acceptable. There
> are some shallows where I might go and I wonder at the practicality
> of raising H&Hs dagger board, and though very beautiful the sailplan
> may take too much time too rig. H&H would be great fun for longer
> deep water bay, or offshore cruises. (Sooner or later these boats
> would be trailed to Great Barrier Reef waters and I worry about
> speeding in the trades over isolated emergent coral bombies :-(
>
> I've no experience with trimarans, but can see the main hull might
> allow accomodation as it can have more beam than a catamarans.Maybe
> a sharpie hull? Also the lighter side floats should make the package
> easier to configure for trailing. Mr Bolger answered my query about
> the camping trimaran 'Beach Cruiser' #554 for US$100 as being a
> design for a hull (sharpie?) using Hobie 16 floats, rig, and
> hardware. I don't know much about it and would love to see a picture
> or drawing. Could it be built without the Hobie hulls, out of ply?
> Does it easily trail, rig, launch? Fast?
>
> ( I've said before some kind of out-rigger sailing canoe / proa
> could be the way to go. At an L/B approaching 6.5 what about a
> partially decked and out-riggered Zephyr? 'Gizmo'(L/B~12) , Jim
> Michalak's take on PCB's 'Minimum Proa' seems do-able but
> accomodation within raised topsides would be very tight.)
> Graeme
>
>
> --- Inbolger@yahoogroups.com, Philip Smith <pbs@w...> wrote:
> > If you want something quick to trail and launch and
> > you haven't got your heart set on a cat, consider the
> > Martha Jane, especially as modified.
>
>
>
>
>
>
> Bolger rules!!!
> - no cursing, flaming, trolling, spamming, or flogging dead horses
> - stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
> - Pls add your comments at the TOP, SIGN your posts, and snip away
> - Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax:
> - Unsubscribe:bolger-unsubscribe@yahoogroups.com
> - Open discussion:bolger_coffee_lounge-subscribe@yahoogroups.com
> Yahoo! Groups Links
>
>
>
>
>
>
>
It would be hard to build anything to replace a pair
of Hobie 16 hulls for less money. This is at least
true in the US where there are Hobie 16s. There are a
lot of derilict Hobie 16s sitting about waiting to
donate their hulls to some project.
I saw an outboard powered cat the hulls of which
started their nautical life as either a Hobie 14 or a
Hobie 16. (The beam had been at least halved.)
of Hobie 16 hulls for less money. This is at least
true in the US where there are Hobie 16s. There are a
lot of derilict Hobie 16s sitting about waiting to
donate their hulls to some project.
I saw an outboard powered cat the hulls of which
started their nautical life as either a Hobie 14 or a
Hobie 16. (The beam had been at least halved.)
I like the Martha Jane, and I've seen one marvelously modified by a
guy who lives aboard and cruises Tasmania to PNG full time. To fit
the kind of messing-about requirements I have in mind, compact,
quick to get in the water and relatively fast on the water, I
thought a multihull of some kind would fit the bill, short of going
to a planing powerboat. Whereas MJ would out score my old Micro, at
23'6" she is fairly big. If I went from 16' to over 20'in a cat I'd
certainly have the speed and spartan accomodation, but again it's a
relatively big project still without the trailing and rigging
complete solutions.
Mr bolger wrote me saying that H&H Schooner at US$100 was an
excellent boat if the comparatively deep keel were acceptable. There
are some shallows where I might go and I wonder at the practicality
of raising H&Hs dagger board, and though very beautiful the sailplan
may take too much time too rig. H&H would be great fun for longer
deep water bay, or offshore cruises. (Sooner or later these boats
would be trailed to Great Barrier Reef waters and I worry about
speeding in the trades over isolated emergent coral bombies :-(
I've no experience with trimarans, but can see the main hull might
allow accomodation as it can have more beam than a catamarans.Maybe
a sharpie hull? Also the lighter side floats should make the package
easier to configure for trailing. Mr Bolger answered my query about
the camping trimaran 'Beach Cruiser' #554 for US$100 as being a
design for a hull (sharpie?) using Hobie 16 floats, rig, and
hardware. I don't know much about it and would love to see a picture
or drawing. Could it be built without the Hobie hulls, out of ply?
Does it easily trail, rig, launch? Fast?
( I've said before some kind of out-rigger sailing canoe / proa
could be the way to go. At an L/B approaching 6.5 what about a
partially decked and out-riggered Zephyr? 'Gizmo'(L/B~12) , Jim
Michalak's take on PCB's 'Minimum Proa' seems do-able but
accomodation within raised topsides would be very tight.)
Graeme
guy who lives aboard and cruises Tasmania to PNG full time. To fit
the kind of messing-about requirements I have in mind, compact,
quick to get in the water and relatively fast on the water, I
thought a multihull of some kind would fit the bill, short of going
to a planing powerboat. Whereas MJ would out score my old Micro, at
23'6" she is fairly big. If I went from 16' to over 20'in a cat I'd
certainly have the speed and spartan accomodation, but again it's a
relatively big project still without the trailing and rigging
complete solutions.
Mr bolger wrote me saying that H&H Schooner at US$100 was an
excellent boat if the comparatively deep keel were acceptable. There
are some shallows where I might go and I wonder at the practicality
of raising H&Hs dagger board, and though very beautiful the sailplan
may take too much time too rig. H&H would be great fun for longer
deep water bay, or offshore cruises. (Sooner or later these boats
would be trailed to Great Barrier Reef waters and I worry about
speeding in the trades over isolated emergent coral bombies :-(
I've no experience with trimarans, but can see the main hull might
allow accomodation as it can have more beam than a catamarans.Maybe
a sharpie hull? Also the lighter side floats should make the package
easier to configure for trailing. Mr Bolger answered my query about
the camping trimaran 'Beach Cruiser' #554 for US$100 as being a
design for a hull (sharpie?) using Hobie 16 floats, rig, and
hardware. I don't know much about it and would love to see a picture
or drawing. Could it be built without the Hobie hulls, out of ply?
Does it easily trail, rig, launch? Fast?
( I've said before some kind of out-rigger sailing canoe / proa
could be the way to go. At an L/B approaching 6.5 what about a
partially decked and out-riggered Zephyr? 'Gizmo'(L/B~12) , Jim
Michalak's take on PCB's 'Minimum Proa' seems do-able but
accomodation within raised topsides would be very tight.)
Graeme
--- Inbolger@yahoogroups.com, Philip Smith <pbs@w...> wrote:
> If you want something quick to trail and launch and
> you haven't got your heart set on a cat, consider the
> Martha Jane, especially as modified.
If you want something quick to trail and launch and
you haven't got your heart set on a cat, consider the
Martha Jane, especially as modified.
you haven't got your heart set on a cat, consider the
Martha Jane, especially as modified.
Sharpie Cat approximates to Wharram Tiki 21:
WLL 18'6"
LOA 21'
BOA 12'
B of hull 3'1" (V hull of similar WLB)
Draft 1'2" (" " " " " SharpieCat
has more for CB & rudder)
Headroom under tent 4'6" ( across bridgedeck )
Sleeps 4 ( 2 in hulls, 2 tented)
Weight empty 790lbs
Weight hull 200lbs
Load capacity approx 1000lbs
Sail area 208sqft
Build time approx 400 hrs
Both good for somewhat differing purposes. Unfortunately neither
quick to trail and launch for, say, a day or overnight cruise. Less
so for an afternoon, on an impulse. Longer cruises and mooring, if
tenable, would alter the equation.
Graeme
--- Inbolger@yahoogroups.com, "Howard Stephenson"
<stephensonhw@a...> wrote:
WLL 18'6"
LOA 21'
BOA 12'
B of hull 3'1" (V hull of similar WLB)
Draft 1'2" (" " " " " SharpieCat
has more for CB & rudder)
Headroom under tent 4'6" ( across bridgedeck )
Sleeps 4 ( 2 in hulls, 2 tented)
Weight empty 790lbs
Weight hull 200lbs
Load capacity approx 1000lbs
Sail area 208sqft
Build time approx 400 hrs
Both good for somewhat differing purposes. Unfortunately neither
quick to trail and launch for, say, a day or overnight cruise. Less
so for an afternoon, on an impulse. Longer cruises and mooring, if
tenable, would alter the equation.
Graeme
--- Inbolger@yahoogroups.com, "Howard Stephenson"
<stephensonhw@a...> wrote:
>ft.
> This would match my back-of-the-envelope-type calculation. In cu.
> it's 6/12 x 20/12 x 23 x 2 (two hulls) x 0.55 (typical PC of ahull
> of this type)= 21 cu.ft. Multiply this by 64 (lb. per cu. ft. ofsoftware
> seawater), you'll end up with 1281 lb.
>
> Alternatively, if you know the total weight, you can work out how
> deeply the hulls have to be immersed to provide the equivalent
> displacement.
>
> Howard
>
> --- Inbolger@yahoogroups.com, "Todd" <ktsrfer@m...> wrote:
> >
> > I did some simple figuring and with the help of ply boats
> > came up with a 6'' draft on 20'' wide hulls 1,300 lb displacment
> for
> > the 23' 6'' sharpie PB Catamaran.
The cabin is neat. Kinda Birdwatcher flexible utility. Ok for semi-
protected waters?
What about individual hull static WLLength/WLBeam ratio? Maybe ~
18'/23"? Giving approx 9.3? Too high?
Wharram's Design book says his first Atlantic crossing catamaran,
Tangaroa, was 23'6". It says the defects were: it had a flat bottom
which pounded ( Bolger says sharpiecat would be rather noisy), its
8/1 individual hull L/B dragged a displacement wave,
and its full
bows gave a slow hull speed. (also after this cat he adopted as one
of his design principles: No permanent deck cabin between hulls.)
IIRC JW states elsewhere superstructure height should be 11% (no
more than 15 percent) of length, or windage will be too much.
Wharram's trailerable 16' Maui design (now not marketed due to newer
stitch and tape stringerless construction methods superseding) has
the option of a solid ply bridgedeck. I gave a lot of thought to
somehow adding spartan accommodation - in the hulls by raising
topsides but leaving an open bridge deck, or by walling in the
bridge deck something like Bolger's Fishcat with a tent top, and so
on. The 60 degree V hulls, displacement, deck clearance and
seaworthiness made it too difficult for me.
However a simple trailable catamaran, easily (= quickly) rigged and
launched at the boatramp, with some spartan accomodation (not a
tent) for one or two, yet with acceptable performance remains an
attractive concept.
Could Sharpiecat be reduced to a trailable beam (Sail area may need
complementary reduction/lowering), or could the bridgedeck/cabin be
fastened down over raised hull coamings in an easily demountable
way? To trailer it dissassembled put the cabin, rotated 90 degrees,
on top of the hulls.
Graeme
protected waters?
What about individual hull static WLLength/WLBeam ratio? Maybe ~
18'/23"? Giving approx 9.3? Too high?
Wharram's Design book says his first Atlantic crossing catamaran,
Tangaroa, was 23'6". It says the defects were: it had a flat bottom
which pounded ( Bolger says sharpiecat would be rather noisy), its
8/1 individual hull L/B dragged a displacement wave,
and its full
bows gave a slow hull speed. (also after this cat he adopted as one
of his design principles: No permanent deck cabin between hulls.)
IIRC JW states elsewhere superstructure height should be 11% (no
more than 15 percent) of length, or windage will be too much.
Wharram's trailerable 16' Maui design (now not marketed due to newer
stitch and tape stringerless construction methods superseding) has
the option of a solid ply bridgedeck. I gave a lot of thought to
somehow adding spartan accommodation - in the hulls by raising
topsides but leaving an open bridge deck, or by walling in the
bridge deck something like Bolger's Fishcat with a tent top, and so
on. The 60 degree V hulls, displacement, deck clearance and
seaworthiness made it too difficult for me.
However a simple trailable catamaran, easily (= quickly) rigged and
launched at the boatramp, with some spartan accomodation (not a
tent) for one or two, yet with acceptable performance remains an
attractive concept.
Could Sharpiecat be reduced to a trailable beam (Sail area may need
complementary reduction/lowering), or could the bridgedeck/cabin be
fastened down over raised hull coamings in an easily demountable
way? To trailer it dissassembled put the cabin, rotated 90 degrees,
on top of the hulls.
Graeme
--- Inbolger@yahoogroups.com, "Todd" <ktsrfer@m...> wrote:
>
> The cabin is the kicker on this cat . Seems you can't have your
cake
> and eat it to. Start optimising the cabin for windage you end up
> with making the hulls taller to acommadate space lost in cabin
which
> adds windage. The cat just looks fun . But I keep seeing 2 skinny
> hulls one short and a one long with a big square cabin in the
> middle;) I'll keep you posted.
>
> Todd
>
> --- Inbolger@yahoogroups.com, "doug6949" <prototype@c...> wrote:
> >
> > Windage is always going to be a factor to consider in catamaran
or
> > pontoon designs. Any cabin you put on it will significantly
> increase
> > the profile.
> >
> > 18" freeboard is not much for a 23 foot cat. Your cabin profile
is
> > what you need to evaluate.
> >
> > Doug
> >
The cabin is the kicker on this cat . Seems you can't have your cake
and eat it to. Start optimising the cabin for windage you end up
with making the hulls taller to acommadate space lost in cabin which
adds windage. The cat just looks fun . But I keep seeing 2 skinny
hulls one short and a one long with a big square cabin in the
middle;) I'll keep you posted.
Todd
and eat it to. Start optimising the cabin for windage you end up
with making the hulls taller to acommadate space lost in cabin which
adds windage. The cat just looks fun . But I keep seeing 2 skinny
hulls one short and a one long with a big square cabin in the
middle;) I'll keep you posted.
Todd
--- Inbolger@yahoogroups.com, "doug6949" <prototype@c...> wrote:
>
> Windage is always going to be a factor to consider in catamaran or
> pontoon designs. Any cabin you put on it will significantly
increase
> the profile.
>
> 18" freeboard is not much for a 23 foot cat. Your cabin profile is
> what you need to evaluate.
>
> Doug
>
Windage is always going to be a factor to consider in catamaran or
pontoon designs. Any cabin you put on it will significantly increase
the profile.
18" freeboard is not much for a 23 foot cat. Your cabin profile is
what you need to evaluate.
Doug
pontoon designs. Any cabin you put on it will significantly increase
the profile.
18" freeboard is not much for a 23 foot cat. Your cabin profile is
what you need to evaluate.
Doug
--- Inbolger@yahoogroups.com, "Todd" <ktsrfer@m...> wrote:
>
> I did some simple figuring and with the help of ply boats software
> came up with a 6'' draft on 20'' wide hulls 1,300 lb displacment for
> the 23' 6'' sharpie PB Catamaran. That leaves about an 18'' clearance
> from deck to water. How much freeboard before windage starts to play
> a major roll remember we have the cabin on top.
>
> Cat weighs what 600 lbs max, 400lbs for family of three 300lbs for
> gear. sweeeeeeeeeeeeeeeet
>
>
> Todd
This would match my back-of-the-envelope-type calculation. In cu. ft.
it's 6/12 x 20/12 x 23 x 2 (two hulls) x 0.55 (typical PC of a hull
of this type)= 21 cu.ft. Multiply this by 64 (lb. per cu. ft. of
seawater), you'll end up with 1281 lb.
Alternatively, if you know the total weight, you can work out how
deeply the hulls have to be immersed to provide the equivalent
displacement.
Howard
it's 6/12 x 20/12 x 23 x 2 (two hulls) x 0.55 (typical PC of a hull
of this type)= 21 cu.ft. Multiply this by 64 (lb. per cu. ft. of
seawater), you'll end up with 1281 lb.
Alternatively, if you know the total weight, you can work out how
deeply the hulls have to be immersed to provide the equivalent
displacement.
Howard
--- Inbolger@yahoogroups.com, "Todd" <ktsrfer@m...> wrote:
>
> I did some simple figuring and with the help of ply boats software
> came up with a 6'' draft on 20'' wide hulls 1,300 lb displacment
for
> the 23' 6'' sharpie PB Catamaran.
I did some simple figuring and with the help of ply boats software
came up with a 6'' draft on 20'' wide hulls 1,300 lb displacment for
the 23' 6'' sharpie PB Catamaran. That leaves about an 18'' clearance
from deck to water. How much freeboard before windage starts to play
a major roll remember we have the cabin on top.
Cat weighs what 600 lbs max, 400lbs for family of three 300lbs for
gear. sweeeeeeeeeeeeeeeet
Todd
came up with a 6'' draft on 20'' wide hulls 1,300 lb displacment for
the 23' 6'' sharpie PB Catamaran. That leaves about an 18'' clearance
from deck to water. How much freeboard before windage starts to play
a major roll remember we have the cabin on top.
Cat weighs what 600 lbs max, 400lbs for family of three 300lbs for
gear. sweeeeeeeeeeeeeeeet
Todd