What can you tell from specs? - SailNet Community
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post #1 of 39 Old 04-28-2009 Thread Starter
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What can you tell from specs?

What can you tell me about an anonymous boat by these specifications:

LOA (on deck): 26'8"
LWL (waterline): 20'5"
Displacement: 7000 lbs
Ballast: 2900 lbs
Beam: 9'10"
Sail area: 323 sq. ft.
Draft: 3'11"

I'm curious about what relatively unbiased opinions I'll get by not naming the boat in question.

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post #2 of 39 Old 04-28-2009
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post #3 of 39 Old 04-28-2009
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From the specs you can determine the speed of the vessel, the capsize ratio.
The comfort ratio and so forth.
After you have worked up these numbers you go and view the boat for yourself and sit in it walk from one end of the cabin to the other. Walk around the deck and if the boat is in the water, you get a feel of how the boat moves.
But it is still on how your own feelings are about that particular vessel.

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post #4 of 39 Old 04-28-2009
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^ ^ ^

Exactly. The specs say it's a beamy, heavy and somewhat shallow draft vessel for the circa 27 foot range, unless it's got a centerboard or is a small full keeler...but it's the same beam as my 33 footer...If this is a guessing game, so I'll guess it's an older boat, pre-1980.

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post #5 of 39 Old 04-28-2009
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It sounds like a beamy full keel, shoal draft, heavy displacement boat...heavier and beamier than a Cape Dory 26... probably very slow...

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post #6 of 39 Old 04-28-2009
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Quote:
Originally Posted by kwaltersmi View Post
What can you tell me about an anonymous boat by these specifications:

LOA (on deck): 26'8"
LWL (waterline): 20'5"
Displacement: 7000 lbs
Ballast: 2900 lbs
Beam: 9'10"
Sail area: 323 sq. ft.
Draft: 3'11"

I'm curious about what relatively unbiased opinions I'll get by not naming the boat in question.

My unbiased and relatively inexperienced opinion would be; Heavy for its size, too beamy for its size, underpowered for its weight.

I can only base this on a boat I had of simular LOA and LWL. Our Displacement was half, ballast was half, beam was 2 foot less, sail area was equal and draft was 1.7 foot more., it was a very quick boat and a blast to sail

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post #7 of 39 Old 04-28-2009
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Quote:
Originally Posted by Valiente View Post
^ ^ ^

If this is a guessing game, so I'll guess it's an older boat, pre-1980.
I would guess post 80's

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post #8 of 39 Old 04-28-2009
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Running the Numbers

I took the opportunity to run the numbers and this is what I get:

DSP to Length = 368 (200-300 is “cruising”)


Sail Area to DSP Ratio = 14.2 (Most boats are between 16-18)

Hull Speed = 6.05 kts

Velocity Ratio = 1.05 (under powered is less than 1)

LOA to Beam = 2.72 (“fine” is 3.5-4)

Capsize Risk = 1.99 (over 2 cannot compete in ocean races)

Comfort Ratio = 22.09 (This is in the range of racers, cruisers are 60+)

The LOA/Beam ratio indicated a little “tubbiness”, but probably is this way to accommodate an interior. To get a “fine” hull, you would need to decrease beam by a foot or more which would probably “loose” the cabin. Where you are getting killed is the relatively small rig (small sail area) in relationship to the displacement. This is going to be a slow boat. The capsize risk and comfort ratios are marginal again, due to the high DSP to length ratio and smaller hull form (length and DSP). So how did I do? What boat is this? A Pacific Seacraft?

Valiente, can you give me your racing boat’s data for comparison?

Last edited by GeorgeB; 04-28-2009 at 05:13 PM.
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post #9 of 39 Old 04-28-2009
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Quote:
Originally Posted by kwaltersmi View Post
What can you tell me about an anonymous boat by these specifications:

LOA (on deck): 26'8"
LWL (waterline): 20'5"
Displacement: 7000 lbs
Ballast: 2900 lbs
Beam: 9'10"
Sail area: 323 sq. ft.
Draft: 3'11"

I'm curious about what relatively unbiased opinions I'll get by not naming the boat in question.
My initial thought were along the lines of a Bruce Roberts Spray 27, or Tom Thumb 26, maybe even a catboat. But most of them would come in with longer waterlines.

She must be a beamy boat (our 31' has the same beam), with longish overhangs. Possibly a double-ender, but they weren't usually so beamy.

The specs certainly don't suggest a club racer....


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post #10 of 39 Old 04-28-2009
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Quote:
Originally Posted by GeorgeB View Post
What boat is this? A Pacific Seacraft?
Har har. Not a chance.


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Pacific Seacraft Crealock 31 #62

NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT
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