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cmckitrick
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USA
116 Posts
Initially Posted - 02/05/2005 :  09:27:44  Show Profile
Can someone tell me what P, I, J, and E mean regarding the C 25 specifications? Thanks.
Charlie McKitrick
Norwell, MA
Valiant Lady... for now
'81 C 25 SR/FK
Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 02/05/2005 :  10:00:35  Show Profile  Visit Frank Hopper's Homepage


E is easy, it is the boom measurement. The measurement is taken from the tack to the maximum clew of the sail. There are often black bands on booms to mark this measurement.
J isn't bad, it is just the foredeck measurement. It is measured from the bow tack to the base of the mast.
I and P are harder.
I is the longest one and is measured from the base of the mast to the top.
P is the shorter long one, it is measured from the gooseneck to the top.
L is the most obscure, but very important to understand. It determines the overlap on your headsail. It is measured at the normal or perpendicular to the forestay (and to the base I think), it is the distance for a 100% headsail; note that it is subtly different from the J.

If anyone thinks I have any of this wrong, please chime in.
Edited by - Frank Hopper on 02/05/2005 10:15:02
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cmckitrick
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USA
116 Posts
Response Posted - 02/05/2005 :  10:10:43  Show Profile
Thanks, Frank and/or Martha. I appreciate it.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 02/05/2005 :  10:13:35  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by cmckitrick</i>
<br />Can someone tell me what P, I, J, and E mean regarding the C 25 specifications? Thanks.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Charlie,

The P, I, J, and E, are standing rig measuements that allow sailmakers to properly size sails to a particular boat.




The "P" dimension is the luff length of the main-sail.

The "E" dimension is the foot length of the main-sail.

The "I" dimension is measured along the front of mast from the highest halyard to the main deck. The main deck is where the deck would be if there were no deckhouse.

The "J" dimenesion is the base of the foretriangle measured along the deck from the headstay to the mast.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 02/05/2005 :  10:26:06  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by fhopper@mac.com</i>
<br />

"...J isn't bad, it is just the foredeck measurement. It is measured from the bow tack to the base of the mast.
I and P are harder."

"...I is the longest one and is measured from the base of the mast to the top."

"...L is the most obscure, but very important to understand. It determines the overlap on your headsail. It is measured at the normal or perpendicular to the forestay (and to the base I think), it is the distance for a 100% headsail; note that it is subtly different from the J."

If anyone thinks I have any of this wrong, please chime in.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Frank,

The J dimension is not a straight measurement from the bow tack to mast base, which on a C25 would result in a longer angular measurement due to the mast base being higher than than the bow tack, but is rather a horizontal measurement from the bow tack to the mast.

The I dimension is not measured from the mast base, but rather from the actual main deck level.

And the L/P measurement of the headsail is the distance from the clew of the headsail to the luff on a line perpendicular to the luff.
Edited by - dlucier on 02/05/2005 10:28:35
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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