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Old 05-19-2017, 12:00 PM   #1
snakyjake
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Question Deadrise: From 12° to 18°?

Considering ride comfort on lake chop...

Is there much of a real difference in deadrise going from 12° to 18° on a 21 foot aluminum boat (or is 18° still bad as 12°)?

Is the weight difference of 800 lbs between two boats going to make a real difference in ride comfort (2,800 vs 3,600 lbs) ?

What about boat length from 22 feet to 23 feet?

Other variables to ride comfort to consider?

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Old 05-19-2017, 04:22 PM   #2
namu mac
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Default Re: Deadrise: From 12° to 18°?

Bigger, heavier and deeper is better for what you described. A sharper entry angle on the bow is better too.
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Old 05-19-2017, 07:14 PM   #3
Eric S
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Default Re: Deadrise: From 12° to 18°?

First off, the distance from the transom to your seat is the most important factor in 'ride comfort'. The closer to the transom, the better the ride.

Next, hull length is on the list. Longer bridges wavelength. Even modest changes in length can be big improvements.

Then deadrise comes up. There's vast differences in warped plane v. constant deadrise, so knowing the shape of the hull is as important as the final deadrise at the transom. Both your angles fall into the moderate deadrise range.

Lastly, hull weight. Weight can be good or bad depending on where it is. Heavier boats can still ride rough, but deep deadrise and heavy weight tend to combine for minimized air under the hull and increase plunging.

For your needs, go take both boats out for a sea trial. The one you like better is the one you should buy. When there isn't a tremendous difference, only a minor one as in this, there are many factors, so just get out in the boat on real water.

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Old 05-20-2017, 04:39 AM   #4
mtriverrunner
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Default Re: Deadrise: From 12° to 18°?

Out of all of the things mentioned, deadrise and length will make the biuggest difference with small changes. I think that all things being equal, the 18 degree hull will probably ride a lot better than the 12.
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Old 05-20-2017, 07:04 AM   #5
Tesoro
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Default Re: Deadrise: From 12° to 18°?

The difference will be night and day driving in a real choppy lake no matter where you and passengers are sitting. Basically you're asking if a river boat will ride as good as an ocean boat in uncomfortable water! nope
Keep in mind that most 'ocean' boats have variable vees...so the bow has a much sharper entry to cut into the chop and send it sideways and then the vee tapers off to 18 degrees in the rear to keep you riding in the water and not on top of it.

river boat hulls are designed to stay on top of the water due to running in water with sharp rocks close to the surface! and to not be steered by the current as much.

Of course alot of use can only afford one boat but use it for rivers/lakes/oceans so the trick is to figure this all out and get a hull type that works the best for what you do the most. I have an 18 deg and it dosent work in fast currents no matter how deep the river. The minute I slow down and let go of the wheel for a second I wind up facing the way I was coming!

There is also a length issue. Personally I would never again own a boat shorter than 21-22ft with a deeper vee type hull
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Old 05-20-2017, 10:08 AM   #6
adrenaline
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Default Re: Deadrise: From 12° to 18°?

Yes, but entry vee also makes a difference, as the bow is what cuts the wave/chop first, fished a 19' 11/28 for over a decade, now a 21' 18/42 is much smoother.
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Last edited by adrenaline; 05-20-2017 at 08:16 PM. Reason: corrected entry vee
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