deadrise vs. displacement?

[rocksandblues]

I have owned a number of boats from pure crap to top tier. build quality aside i have seen the light and am i true believer in deadrise. My current 35' boat has 24deg and travels with ease and comfort through almost any sea.

stick with me...

As i consider moving up again to something around 40'... at what point does displacement overtake deadrise for a superior ride? I know at some point even the Best fishing machines have much less deadrise than would be comfortable on a boat of my current size.

If and when i move up, thinking express, i will be terribly disappointed with a ride less than what i currently have.

[flatbottom]

I believe fuel consumption plays a large part in the deadrise of large boats. I am not sure at what point the weight of the boat over comes the need for deadrise, coupled with width(beam). I am pretty sure fuel consumption is a major factor when deciding how much deadrise and lift a large boat requires.
I also would like to know the formula used in determining deadrise needed in larger boats. Good question rocksandblues !!!

[Reeltitanium]

There is no replacement for displacement!

[gottaflylee]

2 things you can't beat in a boat for a good ride...weigh and length. A few years back I ran a 41' Terra express. She had a very deep V and was a good ride till I sat her down and side to trolling...for get it. From the tower in a turn...hang on. Owner was running the boat once while I was getting rigs ready and came off the top of what I think was a small rouge wave. We must have been 10 or 12' in the air and when we hit I thought we had split the hull open. Throwing open hatches down below and checking the hull as well as all the through hull fitting I found no damage or leaks. I can only assume it was all the "Deadrise" in the boat, 24 degrees as I recall, that kept the boat from splitting into. As most of you know now I run a 50' "Rickie" Has a good sharp entry and a semi flat stern. The "Rickie to me, has the best ride over all and will troll and run side to very well, stable on the drift as well. Having run both...give me a bridge boat over an express to run.

[reel fishy]

As i consider moving up again to something around 40'... at what point does displacement overtake deadrise for a superior ride? I know at some point even the Best fishing machines have much less deadrise than would be comfortable on a boat of my current size.

That is why a lot of boats are built with variable deadrise. You will see quite a few with 60 degrees in the bow and 20 something degrees at the stern. Carolina boats tend to have a very sharp entry and flatten at the stern. Just remember boats with a large degree of deadrise in the stern tend to roll in the trough. That can be further amplified by adding a tower. The farther you go down a hull the less it matters the degree of deadrise. If you are breaking waves with your hull 2/3 the way to your stern there is a problem. The heavy weight will also adversely affect you fuel consumption unless you are running at displacement speeds.

[Mirage36]

IMO you have to be an engineer to cover all of the fine points in the differences between the two.
I'm no engineer, nor an expert but will say this a displacement boat will ride good but it will not be fast without some major iron pushing it. They won't be light or cheap to purchase or run either.

True deadrise is measured at the transom and is probably the best way to get a good ride out of a fast light boat.

So the real "vs" is: concider all of the fine points of one vs. all of the fine points of the other vs. all of the hybrid designs that cover the whole spectrum inbetween vs. the possible hundreds of boat builders out there and there ability to build the quality that fits your budget.

Figure all of that out after you concider what your primary uses will be then you'll have your answer.

JMO...

[flatbottom]

IMO you have to be an engineer to cover all of the fine points in the differences between the two.
I'm no engineer, nor an expert but will say this a displacement boat will ride good but it will not be fast without some major iron pushing it. They won't be light or cheap to purchase or run either.

True deadrise is measured at the transom and is probably the best way to get a good ride out of a fast light boat.

So the real "vs" is: concider all of the fine points of one vs. all of the fine points of the other vs. all of the hybrid designs that cover the whole spectrum inbetween vs. the possible hundreds of boat builders out there and there ability to build the quality that fits your budget.

Figure all of that out after you concider what your primary uses will be then you'll have your answer.

JMO...

I am so confused I might by a cat Here kitty kitty !!!!!