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Catalina/Capri 25/250 Sailor's Forums

General Sailing Forum

Hull Speed

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Rick Heaverly 86 C25 5382
Navigator

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Belize
206 Posts

Initially Posted - 05/23/2002 : 11:00:29

Last Sunday we were out on Invictus, winds raning 15 to 25. I reffed the main and ran up my 110. Average speed was 4-5 mph according to my gps. We got hit with a couple of gusts and the gps read 7-7.5 then 8.2 mph. Is that possible? I thought max hull speed was around 6.7 mph.

Rick Heaverly
"Invictus"

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 05/23/2002 : 13:12:06

Don't forget GPS is reading speed over the ground not through the water. You may be sailing at 5 or 6 Knts and have a 2 or 3 Knts current ? In addition GPS needs a stable signal you could pick it up and wave it around and read 60.

Doug&Ruth
Wind Lass
Tacoma Wa.

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LOREN SOUERS
Navigator

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USA
100 Posts

Response Posted - 05/23/2002 : 16:28:31

<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
Don't forget GPS is reading speed over the ground not through the water. You may be sailing at 5 or 6 Knts and have a 2 or 3 Knts current ? In addition GPS needs a stable signal you could pick it up and wave it around and read 60.

Doug&Ruth
Wind Lass
Tacoma Wa.
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

FYI, the same is true about law enforcement radar. They read 35 and 55 mph just held up to tuning forks.

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 05/23/2002 : 23:44:44

You can certainly exceed hull speed (about 6.3 kts) when on a broad reach or running such that you can catch the front side of a wave and actually surf on it. Upwind, it's pretty tough to exceed hull speed unless you have enough power to get the bow up over the bow wave, (planing) which is not likely on our boats. But it's easy on a sunfish!

Dave Bristle - 1985 C-25 #5032 SR-FK-Dinette "Passage" in SW CT

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gnorgan
Admiral

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USA
563 Posts

Response Posted - 05/25/2002 : 02:09:00

Rick, I see what you meant now re: "copying cat." <img src=icon_smile_blush.gif border=0 align=middle> Didn't know you'd posted this. So is your 110 a reefing jib?

C25 tall/wing
Classical Cat #5944

Edited by - gnorgan on 05/25/2002 02:14:21

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Rick Heaverly 86 C25 5382
Navigator

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206 Posts

Response Posted - 06/03/2002 : 16:44:21

gnorgan,

my head sails are all hank on, 150 for tall rig, 150? for standard rig that i found in the dumpster at a marina and a 110 for tall rig.

Rick Heaverly
"Invictus"

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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.