Deadrise: From 12° to 18°? -

Go Back > Ifish Fishing and Hunting > Boat and Motor Tech


Thread Tools Display Modes
Old 05-19-2017, 12:00 PM   #1
Join Date: Jul 2012
Posts: 33
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?

snakyjake is offline   Reply With Quote
Sponsored Links
Old 05-19-2017, 04:22 PM   #2
namu mac
Ifish Nate
Join Date: Aug 2005
Location: Klipsan Beach
Posts: 3,469
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.
The worst day fishing beats staying home and doing yard work.
I eat salmon not Sea Lions
namu mac is offline   Reply With Quote
Old 05-19-2017, 07:14 PM   #3
Eric S
Ifish Nate
Eric S's Avatar
Join Date: Jun 2009
Location: Spokane, Wa
Posts: 3,055
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.

Eric S is offline   Reply With Quote
Old 05-20-2017, 04:39 AM   #4
mtriverrunner's Avatar
Join Date: Mar 2008
Location: Bozeman MT
Posts: 52
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.
mtriverrunner is offline   Reply With Quote
Old 05-20-2017, 07:04 AM   #5
Join Date: Feb 2015
Location: Grants Pass
Posts: 294
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 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
Tesoro is offline   Reply With Quote
Old 05-20-2017, 10:08 AM   #6
King Salmon
Join Date: Jun 2004
Posts: 8,090
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.
Ken 21' NR Seahawk(Maxxum) "Adrenaline"

Last edited by adrenaline; 05-20-2017 at 08:16 PM. Reason: corrected entry vee
adrenaline is offline   Reply With Quote
Old 05-24-2017, 06:29 PM   #7
Brokeass Boater
Brokeass Boater's Avatar
Join Date: Feb 2017
Location: Brentwood, Norcal
Posts: 80
Default Re: Deadrise: From 12° to 18°?

23-24 degrees is considered deep v, 18 would be moderate, 12 is O'my aching back. Always a trade off with hulls, 23 degrees will give you some rough head seas chop handling, but may pitch in the trough, and be a little tippy walking around, ( talking about boats under 25' and 8-8 1/2' beam) compared to a semi v boat with the same beam. On a lake, the swell not much of a concern, but walking/standing around the boat and where the crew sits does matter for leveling the boat, especially when your running across the lake. Unfortunately there's no magic number/combination for smaller boats, except length will help when it comes to a head chop, but that alone will need some dead rise to achieve the best ride. Speed in choppy water is the best solution,,,gregg
Brokeass Boater is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Cast to

All times are GMT -8. The time now is 04:31 AM.

Terms of Service
Page generated in 0.29270 seconds with 30 queries