What you were told was incorrect, as the instructions and diagrams from the USCG indicate. Nothing above the deck/hull joint counts - as they spell out in the instructions. In my case the fin keel was counted as part of the depth, as it hangs from a stub that is clearly part of the hull, and the keel itself shares the lines of the keel stub, qualifying it as "faired or integral". You cannot see where the stub ends and the keel starts. So, the keel stub itself adds to the argument that the keel and the hull are all one "vessel" for measurement purposes, even though it lacks any real  storage capacity. I guess it's the thought that counts!  :-) A keel bolted directly to a flat hull bottom could not be counted, and neither could a retractable or swing keel. A friend who served at documentation headquarters, told me that they feel a lot differently about documentation measurements for recreational vessels than they do about freighters and tankers.

Bill Bina

On 4/23/2013 10:52 AM, Rick Brass wrote:

I was curious about the actual 'Hull Depth" measurement because when I applied for documentation I was told to use the distance from the inside of the cabin top to the cabin sole. The tonnage calculated by USCG is a measure of interior volume available for cargo not weight, after all.

 

Here are the USCG instructions from the measurement form:

 

 

DEPTH (D) is the vertical distance taken at or near amidships from a line drawn horizontally through

the uppermost edges of the skin (outside planking or plating) at the sides of the hull (excluding the

cap rail, trunks, cabins and deckhouses, and deck caps) to the outboard face of the bottom skin of

the hull, excluding the keel.  If your vessel is designed for sailing and the interface between the

"keel" and the "bottom skin of the hull" is not at a clearly defined location (as is the case with an

"integral" or "faired" keel), include the keel in the depth measurement.

 

 

-----Original Message-----
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Bill Bina
Sent: Tuesday, April 23, 2013 5:50 AM
To: cnc-list@cnc-list.com
Subject: Re: Stus-List sailboatlistings.com Inaccurate Listing for a 33-1

 

The hull depth measurement for documetation purposes is not the same as the draft. The hull depth on my C&C 27 is 6.8 feet, and it's draft is about 5 feet. I think the design draft for my boat is stated as 4 feet

11 inches. Draft is the length below the water line when the boat is floating. Hull Depth is measured from the toerail down to the bottom of the fixed keel.

 

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