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 Hull speed pushed to the edge

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Floody
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Posts : 154
Sailboat : Clipper Marine 26
Male Join date : 2012-05-24
Job/hobbies : Electronics Engineer

PostSubject: Hull speed pushed to the edge    Fri Jun 15, 2012 2:27 pm

Since I have no way of determining how fast I am sailing or wind speed what will happen if I push it to hard?

I know the hull speed of my Clipper 26 ~ 6 knots.

Say I want to sail in what I think is strong winds what will happen to my ship if I sail too fast? Will she just max out and keep pressing forwards or will the water overtake the bow and make my ship a new fish home? I think that more than likely my boat will just stop accelerating and maintain a constant velocity. Is this correct?
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frelichth
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Male Birthday : 1959-02-21
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PostSubject: Re: Hull speed pushed to the edge    Fri Jun 15, 2012 8:47 pm



The drawing above should help you guage your speed. At hull speed the standing wave along the boat will be as long as your waterline length ( R=4 in this drawing). At 1/2 your hull speed 2 of these waves will occur, at 1/3 three will occur, etc. At anything higher than your hull speed your boat will attempt to ride up the front of the standing wave and go on plane. Since this takes much more energy than the rigging will supply you are basically stalled at your hull speed as you assumed. However, the extra energy generated will still try to push you into the wave front and the associated strain produced in doing so will be transfered to the rigging, causing undue stress. As I reach hull speed I typically tend to slack the sheets and spill the excess air, thus maintaining speed shile reducing stress on the rigging. If the wind is that strong reefing is also a prudent option. That is my understanding of the subject in any case.
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Kelly CM26
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PostSubject: Re: Hull speed pushed to the edge    Sat Jun 16, 2012 8:51 pm

Floody, You won't sail too fast. You get to hull speed and are, in effect, maxed out. Any excess power generated by the sails will result in heeling and side drifting. This will scare the crap out of your crew. Drop your traveler downwind, let out on the main, or turn into the wind when you start to heel. Fly a smaller jib, or no jib. Learn to reef, and heave to. Start your motor, drop your main and get off the water. Use some common sense whether to go out or not, and build your abilities. Go to the library and check out books on sailing, or take a class. Oh, if worse gets to worse, let loose of the tiller it will turn into the wind for you. Mr. Frelichth, I've enjoyed your postings and I also have trouble giving a damn.
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Floody
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Posts : 154
Sailboat : Clipper Marine 26
Male Join date : 2012-05-24
Job/hobbies : Electronics Engineer

PostSubject: Re: Hull speed pushed to the edge    Sun Jun 17, 2012 11:20 pm

Well let me tell you, that you are both correct and I now respect the wind unequivocally. I learned the difficult way...

...My wife and I sailed this weekend and the wind on the last day were the strongest I have sailed, for me and my family at least. The first mistake made was when my wife and I put up the genoa (160%) on a day that had wind speeds at 20 mps avg mixed with 34 mph gust.

I was nervous but stayed cool. One thing I debated in my mind during this moment of mental chess was to pull the genoa and reef the main. But I was not sure of if this was okay conditions or not so I pulled the genoa as my wife sailed it. She and I did the things that you guys suggested above. We sailed in this for about 1 hour with the conditions getting worse. Long story short, we made it out okay but with white knuckles and tiny grins.

Lessened installed. On a positive note: The gear held up good. During that event I could hear my lines screaming at me, yet nothing gave out. I wish I had my camera on, but that was my last thought at the time.

I did take a video and its on my website so take a look if you want.
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