driving too hard?

socomon

Recruit
Joined
Jun 9, 2002
Messages
2
I have a 25' express cruiser and operate on the Chesapeake Bay. The bay can be rough at times. My boat doesn't have much deadrise and tends to pound, especially upwind in chop or crossing large boat wakes. She sometimes lands with a slam. How do I know if I'm driving her too hard and risking structural harm. I have my share of stress cracks in the gel coat and saw a new one after this past weekend. Is this a sign i'm pushing too hard by going too fast in chop? What is the best way to drive an i/o in strong wind and choppy water?
 

crab bait

Captain
Joined
Feb 5, 2002
Messages
3,831
Re: driving too hard?

what can i say ..... stress cracks are not a good thing... if your pushing to hard an it's crackin up.... what can i say.... i guess take it slower.... try alittle bow high ...
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: driving too hard?

Howdy, Socoman.<br /><br />That sort of punishment will destroy some boats. . .cheaply made, thin skinned boats like. . . um, ah, well cheap. You know who I mean.<br /><br />Other boats, like Boston Whalers, McKees, Carolina Skiffs (to cover three price ranges) love being slammed around. It is the helmsman and passengers that get destroyed. <br /><br />I very nearly bled to death from internal injuries inflicted by such treatment just a few years ago. <br /><br />I haven't figured out what it is that so many skippers don't understand about "appropriate speed and maneuvering". <br /><br />You need to master maneuvering and speed management in rough conditions.<br /><br />Good luck. :)
 

socomon

Recruit
Joined
Jun 9, 2002
Messages
2
Re: driving too hard?

I was probably only going about 20-25 in a two foot chop with a 15-20 mph wind. You wouldn't think that would be so bad but it was pounding. My boat is a maxum - which isn't the greatest quality and weights about 5,000 lbs dry. I tried running bow up by the headwind really slowed me down.
 

FlyBoyMark

Ensign
Joined
Apr 14, 2002
Messages
934
Re: driving too hard?

GOOD quality boats are not supposed to BREAKUP when driven hard within their design limitations of engine and speed combos. If they do I would have some serious quality doubts about the boat......(personally, that is....)
 

Hooty

Rear Admiral
Joined
Oct 2, 2001
Messages
4,496
Re: driving too hard?

Yo socomon,<br />My guess is the boat's as tough as you are, flat bottom and all. I/we TRIED to sledge-hammer a fiberglass hull (Lonestar)to distruction. They're TOUGH!<br /><br />c/6<br /><br />Hooty
 

Franki

Lieutenant Junior Grade
Joined
Feb 16, 2002
Messages
1,059
Re: driving too hard?

Also, Gelcoat gets brittle and damaged from UV and exposure.. and that can make it spider at the slightest provocation... it does not mean that the underlying fiberglass is compromised though.. just keep an eye on the glass in areas of high stress like the tramsom and watch for real cracks.<br /><br />Experimentation is the key.. my boat has a tendency to slam as well, and the first time I noticed that, I played with trim and speed in a rough area till I had worked out what trim worked at what speed to minimise the effect..<br /><br />first time it happend I was near WOT and I thought the boat was gonna snap in half. it wasn't a big chop either, but I got airborn and landed hard.. there wasn't any sign a problem though, it was me that lost years from the experiance.<br /><br />rgds<br /><br />frank
 

suzukidave

Petty Officer 1st Class
Joined
Jul 1, 2000
Messages
387
Re: driving too hard?

All boats will slam in the conditions you describe at some point. What varies is how big the waves are before your boat meets its design limits. The factors that cause pounding are trim, hull weight, deadrise and hull-v shape and length. The factors that dictate the impact on the boat from the pounding are hull strength (mainly thickness) and stringer design/integrity.<br /><br />You can adjust the trim within safety limits, but the rest you are stuck with. If your boat is a maxxum it is built for speed not weather -- it's light and has a flattish v bottom. It will pound easy and because it is built light it will suffer more than most boats from the pounding. I doubt you are cracking it up in a 2 foot chop, but over time your boat will not tolerate pounding.<br /><br />things you can do:<br /><br />1. try sucking the bow down a little with your trim control (stay safe) and reducing speed until you don't pound in a bad way. I think the difference between a healthy pound and a bad pound is in the vibrations you feel -- you want to work towards no vibrations or shudder so it feels more like you are slamming the door of '66 buick electra 4 door post than a '93 Yugo. That tells you the keel is absorbing the shock rather than transmitting it all through the hull, possibly unevenly.<br /><br />2. if you can't stay on plane with method one and you are in a hurry, make like a sailboat and tack your way upwind. Quartering the chop will reduce pounding a lot and maybe let you stay on plane if you don't mind a bit of a roll.<br /><br />3. Otherwise, what's your hurry? Nothing wrong with just running at fast troll if your boat can't take the chop. Your boat has a design limit but when the weather clears up you will scoot right past that whaler. Have a beverage and enjoy the day.
 

Mumblerone

Petty Officer 1st Class
Joined
May 12, 2002
Messages
344
Re: driving too hard?

I agree with JB, a good boat can take alot more than the people in it...and it should be that way. Even in a great boat you hit that odd wave that's larger and the boat will slam/pound...if this happens consistantly, I will slow down. Those ten footers are tough sometimes. :p As to structual damage, this shouldn't be happening. I'd have it checked out by the dealer or marine surveyor. ;)
 
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