Deadrise v rough water and slow speed (sub 30')
#21
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From another thread in the Active Thunder section::
Ironically I just took some pictures and sent them to him this morning. I have been quiet about this since the project is taking time to complete. I didn't want to put anything out there until we were about 30 days away of the debut.
Since the tooling for the basic boat was complete we had to go back and design and build the dash pods from scratch as well as storage boxes for the front seating and the enclosed head. Also, even though we had made molds for the back seats of the 33, the cockpit seat molds required modifications for the 29 due to the fiberglass cockpit liner's size.
Here's a couple of teasers for you.
![](https://www.offshoreonly.com/forums/attachments/active-thunder/557085d1468075937-29-o-b-defiant-pics-bow-1.jpg)
![](https://www.offshoreonly.com/forums/attachments/active-thunder/557086d1468075938-29-o-b-defiant-pics-bow-2.jpg)
![](https://www.offshoreonly.com/forums/attachments/active-thunder/557087d1468075940-29-o-b-defiant-pics-cockpit-1.jpg)
![](https://www.offshoreonly.com/forums/attachments/active-thunder/557088d1468075941-29-o-b-defiant-pics-cockpit-2.jpg)
Since the tooling for the basic boat was complete we had to go back and design and build the dash pods from scratch as well as storage boxes for the front seating and the enclosed head. Also, even though we had made molds for the back seats of the 33, the cockpit seat molds required modifications for the 29 due to the fiberglass cockpit liner's size.
Here's a couple of teasers for you.
![](https://www.offshoreonly.com/forums/attachments/active-thunder/557085d1468075937-29-o-b-defiant-pics-bow-1.jpg)
![](https://www.offshoreonly.com/forums/attachments/active-thunder/557086d1468075938-29-o-b-defiant-pics-bow-2.jpg)
![](https://www.offshoreonly.com/forums/attachments/active-thunder/557087d1468075940-29-o-b-defiant-pics-cockpit-1.jpg)
![](https://www.offshoreonly.com/forums/attachments/active-thunder/557088d1468075941-29-o-b-defiant-pics-cockpit-2.jpg)
Last edited by Sydwayz; 07-11-2016 at 10:36 PM.
#22
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RR
#23
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Love all that, who wouldn't?
Complicated at my end with a possible sale on my current rig and also my weak Aussie dollar doesn't help. I think we're pushing the budget but maybe if i can get all my ducks to line up at the same time.....?
My short list is still open.
RR
Complicated at my end with a possible sale on my current rig and also my weak Aussie dollar doesn't help. I think we're pushing the budget but maybe if i can get all my ducks to line up at the same time.....?
My short list is still open.
RR
#25
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Going back to my original post, can a boat with low deadrise still work well in the rough of it has a fine entry?
RR
#26
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Thanks RR, if that boats not too far out of your travels if you could have a casual look would be appreciated. I notice someone mentioned a cobalt 262, having owned both a 2008 sea Ray 270 slx and a 2012 cobalt 262, can confidently say the cobalt was a much better built boat, however the ride still wasn't the best, but certainly better than the searay, friends of ours owned a 302 cobalt with twin 496 and that was a much nicer ride, sometimes you can't beat the share displacement of a bigger boat. For reference all these boats were on the Gold Coast in Aus and used in Morton Bay, which as I'm sure you know can get fairly choppy.
#27
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Only if you are off plane and that fine entry is the first point of contact with the chop/wave. Otherwise it is just hanging out in the breeze doing nothing but waiting for the next big one.
#28
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Let me qualify that. A vented (stepped) hull will run flatter than a traditional straight or variable vee hull. A fine entry on a vented hull will be in a better position to pierce the wave first and will therefore have more of an effect on ride quality when on plane. So I modify my opinion from No to Perhaps, depending on the boat you choose. Still, not much beats deadrise for splitting waves and improving ride. The simplest solution is to find a high deadrise boat if you can stand the higher planning speed. Our Baja will plane down to about 21-22 mph with the tabs fully deployed. About 26-27 is as slow as it will go with no tabs. The shallower the deadrise the slower it will go and the flatter it will run on plane. It is a tradeoff for sure.
#29
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Thanks RR, if that boats not too far out of your travels if you could have a casual look would be appreciated. I notice someone mentioned a cobalt 262, having owned both a 2008 sea Ray 270 slx and a 2012 cobalt 262, can confidently say the cobalt was a much better built boat, however the ride still wasn't the best, but certainly better than the searay, friends of ours owned a 302 cobalt with twin 496 and that was a much nicer ride, sometimes you can't beat the share displacement of a bigger boat. For reference all these boats were on the Gold Coast in Aus and used in Morton Bay, which as I'm sure you know can get fairly choppy.
As an ex Melbourne boy on Port Phillip Bay, if a boat can't handle a few waves then it's not much of a boat!
Interesting your thoughts on the Cobalt, they're something I've considered. I'm just restricting myself on size and a single engine due to ease of towing and maintenance.
Sent PM about the Fountain in Phuket.
RR
#30
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Maybe I'm asking too much out of a boat around 25-28'?
Baja 26' Outlaw still hits me as the best in terms of ride, I'm just struggling to understand how a boat like a Crownline or a Cobalt has so much useable space in the cockpit and go fast boats of the same size have so little. Where did it all go?
Thanks for the input,
RR