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Steiger craft 23 Miami and the 26 Ches (19-22 deadrise)
272 Sportcraft (13 deadrise)
277 GLE Baha (15 deadrise)
What the hell is the deal with the differences in dead rise. I understand that low deadrise makes for a stable platform, but does that mean they pound? And does that mean the Steiger will roll like all hell?
I just thought for havein a 13 or 15 deadrise would make these boats get beat to death...all of them weight around the same about 6000lbs
Those are transome deadrise. To get a complete picture, I'll need to know the entry deadrise. Short answer: yes, all things being equal, less deadrise=a rougher re-entry. What causes this is water tension (i.e., the weak hydrogen bonds between water molecules). Because of water tension, water resists the splitting of these bonds and holds together. Water tension is not strong, but if you are going fast, the tension is amplified. For example, jump out of your boat while going 5 mph and then 35 mph. Also, the more blunt the surface, the less psi is applied. At any given speed, a certain amount of psi is needed to break water tension. What this translates to is that a boat with little deadrise is more blunt than one with more deadrise. So, when you land on the water from hitting a big wave while going fast, the more deadrise, the more readily you will cut through the water. the reason I am concerned with entry deadrise is that the number of times your transome goes airborne is dwarfed by the number of times your bow will go airborne.
I don't think anyone gives entry deadrise figures. Anyway sure the deeper V the better ride in rough seas. Also need to consider length, beam, weight and weight distribution. There have been many posts on deadrise over the years and you might want to search the site the post any questions you may have.
We all love to fish in deep water but most of us have to go through shallow water to get there and get back home at the end of the day. Keep in mind that the greater the deadrise (higher number of degrees in the angle) the greater the draft of the boat will be for any given beam. Simply put if you have two boats, each with an eight and a half foot beam, the one with the 19 degree deadrise will draw more water than the one with the 15. If you spend any time worth mentioning in skinny water that may mean something to you.
Thom
"Just because you're on their side doesn't mean they're on your side."
(--Teresa Nielsen Hayden)
Rhinoreeler,
Transome deadrise represents different things. For instance, it is a good indicator (but not perfect) as to the overall deadrise of the boat. Many boats do not have variable deadrise, so transome deadrise is the steepest angle you get. Also, the transome is generally the heaviest section (assuming o/b) of the boat. A steep angle here will affect stability at rest more than anywhere else, so in that case, transome deadrise is an excellent indicator of at rest stability. Also, the transome on planing hulls is generaly where the boat is the most in the water. Transome deadrise gives you an idea about how well the boat will track. More deadrise=a better tracking boat. However, as has been mentioned before, there is much more to the boat than deadrise that contributes to ride quality. Quite frankly, I would have to know more about each boat to even begin to predict their respective qualities at rest and moving.
quote:Originally posted by RhinoReeler:
So then the deadrise at the transom represents what? Is it more important to know the entry deadrise than the deadrise at the transom.
I agree that entry and amidships deadrise are very important in determining how a boat rides (along with a lot of other things like weight distribution, etc. To me, a steep transom deadrise is an indication that the manufacturer was trying to make a boat with a good ride. Other manufacturers will use lesser transom deadrise to address other issues (stability, fuel economy, slow speed handling, to name a few) but try to keep a sharp entry carried far aft.
Keep in mind that deadrise tells you something about the characteristics of the hull but many other factors impact ride.
Just one nit to pick here - "More deadrise=a better tracking boat". This is more true the higher the speed. But at very low speed More deadrise can = a squirrellier boat. (Not at all sure about the spelling of "squirrellier" [img]/infopop/emoticons/icon_biggrin.gif[/img] .) Point is, the best deadrise is to a large degree a matter of speed. Faster boats need more, slower boats are better off with less. Which is why lumbering motoryachts have less deadrise than banzai SKA center consoles. Think speed as much as ride.
While everyone measures deadrise, I see very few if any boat manufacturers measure DEGREE OF ENTRY INTO THE WATER.
This is where the rubber meets the road. You can have 24o of DR and only 25o of Entry, the boat will not ride good except in calm seas.
Regulator has a 48o entry and that is why they ride so "soft." They dont advertise this fact very much but it is the reason for a far superior ride than any other boat in its class.
Ride 'em before you buy 'em.
23' Regulator, 2 200 HP Yamaha HPDI's. Charter and SKA Tournament fishing, Chair of King Mack Tourn. benefits underpriviliged kids in Eastern NC.
Deadrise on 23-27' boats
