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NautiC25
Admiral

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USA
957 Posts
Initially Posted - 06/05/2012 :  19:44:22  Show Profile
After 3 years of ownership, I finally took a tape measure to my genoa to see what I have. I got a foot measurement of approx. 16'-10". I then looked in my 89 manual to find the correct foot measurement of a 150. It says 17.25'. So I'm instantly upset thinking I have less than a 150%. Just to make sure though, I check the online post-88 manual, and it says 16'-10".
I'm guessing that I do in fact have a 150%, but why does my 89 manual have a much larger foot measurement?

Cliffnotes: First I was like "fuuuu", then like "whaa???", then like "orly!!!"



Here's a pic of the sheet:
1989 C-25 TR/WK #5894
Miss Behavin'
Sittin' in LCYC on Canyon Lake, Texas
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GaryB
Master Marine Consultant

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USA
4311 Posts
Response Posted - 06/05/2012 :  20:02:13  Show Profile
The tall rig furling 150% is 16' 4". The hank-on 150 is approx. 17' 3".

Is your sail an original 150 hank on or an after market? If after market they may be cut slightly different.
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NautiC25
Admiral

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USA
957 Posts
Response Posted - 06/06/2012 :  05:23:34  Show Profile
IIRC, it's made by Schurr. It's a hank on.
Why would you say that it's supposed to be 17'-3"? I know MY manual says so, but apparently previous manuals say 16'-10".
Check page 9: http://www.catalina-capri-25s.com/manbro/Cat25Post88scanned.pdf
Edited by - NautiC25 on 06/06/2012 05:26:34
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 06/06/2012 :  06:05:03  Show Profile
The length of the foot is irrelevant.

The measurement that determines the relative size of the headsail is the <b>LP</b> or <b>Luff Perpendicular</b>. "LP is the distance from the clew of the jib to the luff line of the jib in a direction to cross the luff at 90°." That measurement is then compared to the "J" measurement of the boat. The result is a percentage of the "J" measurement. The "J" measurement is defined as: "Distance is measured from the foreside of the mast to the point where forestay attaches to deck." That line is level with the water line. The "J" on a C25 is 10.5 feet. 150% of 10.5 is 15.75 feet. Therefore, a 150% sail on a C25 will have a Luff Perpendicular of 15.75 feet regardless of the length of the foot.

Now, how to account for 2 150% sails having 2 different foot measurements. It can easily be explained by the cut of the jib. If, for example, the jib is cut to allow for increased visibility, the clew may be higher than its deck sweeping cousin. That would necessarily result in a longer foot while keeping the clew at the same relative distance from the luff.
Edited by - John Russell on 06/06/2012 06:13:13
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Stinkpotter
Master Marine Consultant

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Djibouti
9082 Posts
Response Posted - 06/06/2012 :  06:27:33  Show Profile
Pretty good for a flyboy!
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Sam001
Vice Commodore

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USA
441 Posts
Response Posted - 06/06/2012 :  07:27:13  Show Profile
All that math! As long as the sail works......
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Joe Diver
Master Marine Consultant

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USA
1218 Posts
Response Posted - 06/06/2012 :  08:15:52  Show Profile


It was my understanding that there would be no math.....
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OLarryR
Master Marine Consultant

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USA
3473 Posts
Response Posted - 06/06/2012 :  09:20:17  Show Profile  Visit OLarryR's Homepage
Never checked ! It is what it is...at least for now. But you have a good question. I am not going down to take measurements off my 150 but I bought the Quantum sail about 3-4 years ago and I believe my paperwork at home reflects the drawing they made up since the sails were custom made. If I have the dimensions at home, I'll report back.
Edited by - OLarryR on 06/06/2012 09:21:36
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OLarryR
Master Marine Consultant

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USA
3473 Posts
Response Posted - 06/06/2012 :  14:57:55  Show Profile  Visit OLarryR's Homepage
It looks like I do not have the exact measurements at home.
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 06/06/2012 :  19:57:00  Show Profile
As John so well explained, the percent is just a measure of overlap, or lack thereof, it has no relationship with sail area.
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GaryB
Master Marine Consultant

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USA
4311 Posts
Response Posted - 06/06/2012 :  22:11:21  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 NautiC25</i>
<br />IIRC, it's made by Schurr. It's a hank on.
Why would you say that it's supposed to be 17'-3"? I know MY manual says so, but apparently previous manuals say 16'-10".
Check page 9: http://www.catalina-capri-25s.com/manbro/Cat25Post88scanned.pdf
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
The others have thoroughly answered how to measure the size of your sail.

To answer your question about measurements, if you look at the picture in your original post it shows the measurements for the TR on the right side of the page. It lists the standard 150 genoa measurements directly below the 110 jib. The foot is 17.25 ft or 17' 3". The furling 150 is listed at the top of the column on the far right next to the measurements for the main. It lists the furling 150 genoa foot at 16.29 feet or just over 16' 3".

As mentioned above the difference is the cut of the sail for the furler vs the hank on deck sweeper.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.