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  #11 (permalink)  
Old 07-01-2008
sctpc sctpc is offline
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Yes but what would the optimal height formula be I have been reading for over 4 hours since I read this post and lots of designers mention it but is there a rule to it, 'deck should be 2 foot making cabin 9 foot for a 30 foot cat or deck 4 foot cabin roof 10 foot for a 50 foot cat.

I find it interesting that all the other design stuff is quite well out explained but none on windage problems ect.
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  #12 (permalink)  
Old 07-01-2008
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sailingdog sailingdog is offline
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there isn't a basic rule for bridge deck clearance and cabin height. Some designers avoid the problem entirely by not using the bridgedeck form living accommodations. Wharram's design often don't have any living space on the bridge deck.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this POST.

Still—DON'T READ THAT POST AGAIN.
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  #13 (permalink)  
Old 07-01-2008
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chucklesR chucklesR is offline
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Check out Performance Cruising Inc. - The Official Gemini 105MC and Telstar 28 Web - I find the boat to be a best of both worlds design in a smallish cruising catamaran. I am of course partial and biased.
The hulls are roughly 8:1 length: beam. I've had mine at 10.3 knts SOG in 16 knts on a close reach (50 degrees off the wind) going up current in 1.25 knts of current. Other owners have reported (and photographed) top speeds of 18 knts, and routinely get 10+.

From the side the gemini looks like a moderately high windage mono. That's hard to do with a queen sized bed in the master cabin and twin staterooms aft with double beds. It has 39 inches of clearance at the front it takes chesapeake chop well on the nose, but with only 18 inches at the stern we do get the occasional 'thumb' on the floor of the cockpit. Reportedly they do well in typical ocean swell and have crossed the Atlantic and Pacific Ocean quite well. Several reside in Hawaii, having sailed there on their own bottoms, a couple are currently circumnavigating (theslapdash.com.
By making the salon area standing height for only the walk in area and sitting height at the salon table Tony Smith (the designer) was able to give it a nice profile. Otherwise, headroom is 6'2" throughout.
I routinely dock my boat in a cross wind of 5 or so knots and I can tell you it parks and tracks as surely as a car with very little problem caused by windage.
Mine:
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Last edited by chucklesR : 07-01-2008 at 10:21 AM.
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  #14 (permalink)  
Old 07-01-2008
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sailingdog sailingdog is offline
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chuckles-

fyi, your link to slapdash is busted, got a ")" where it ain't supposed to be.
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Sailingdog

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this POST.

Still—DON'T READ THAT POST AGAIN.
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  #15 (permalink)  
Old 07-01-2008
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chucklesR chucklesR is offline
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Fixed it, thanks.
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  #16 (permalink)  
Old 07-01-2008
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De nada...
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Sailingdog

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this POST.

Still—DON'T READ THAT POST AGAIN.
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