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Author Topic:   Dead rise

Bosmass posted 10-16-2002 03:44 PM ET (US)
I figure two dumb questions per month…
A lot of boat manufacturers list the 'dead rise' of their boat. What exactly is it and why is it important

newt posted 10-16-2002 03:56 PM ET (US)
Looking at the stern, the deadrise is the angle between the bottom of the hull and the horizontal. So, a flat bottom boat has no deadrise, and a canoe has lots of deadrise.
In simple terms (from my simple mind), the more deadrise, the softer the ride (deeper V), but more roll at rest. Less deadrise means more pounding, but more stable at rest.
kingfish posted 10-17-2002 09:32 AM ET (US)
In addition to those considerations, less deadrise takes less power to plane and hold plane, so is more fuel-efficient and requires less horsepower for the same speed and weight. And less deadrise means shallower draft.
Bosmass posted 10-17-2002 11:27 AM ET (US)
Thanks, I will incorporate your notes when looking at and evauluating boats.
Got M Hooked posted 10-27-2002 07:10 PM ET (US)
Does anyone now the deadrise on a year 2000 Montak 17 ?
Tom W Clark posted 10-27-2002 08:02 PM ET (US)
Got M Hooked ,
It's kind of meaning less to use the term deadrise with a hull like a Montauk's. A Montauk does not have a deep-V hull nor does the central hull have a constant angle on it.
The bottom of the hull is rounded so the angle you might measure is entirely dependent on exactly where on the hull you measure it. If you measure it adjacent to the keel it’s going to be zero degrees. The further from the keel you measure it the greater the angle.
In spite of this, Whaler did have a specification for deadrise on their web site for the Montauk. How they came up with that number I have no idea. Doesn't really matter as it doesn't tell you much.
jimh posted 10-27-2002 09:02 PM ET (US)
Simply assessing the amount of deadrise on a hull is not much of a metric for deciding how well it rides.
If you like to go bashing into head seas as fast as possible, get plenty of deadrise. That is what offshore race boat hulls have.
If you want a well designed boat that is stable, rides well, planes with minimum power, and has proven characteristics, get a Classic Whaler.
latourfiveo posted 10-28-2002 08:59 AM ET (US)
This is one of the main reasons I tune in to this site, technical information like this. I had always wondered what deadrise was too, actually I thought I knew but was wrong. This site will make a sailer out of me yet! Keep up the good work Jimh and company!
L50
Got M Hooked posted 10-28-2002 09:15 AM ET (US)
I was told that the new Montauk is flatter at the transom, compared to the classic hull, less deadrise, Is this true???

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Author	Topic: Dead rise
Bosmass	posted 10-16-2002 03:44 PM ET (US) I figure two dumb questions per month… A lot of boat manufacturers list the 'dead rise' of their boat. What exactly is it and why is it important
newt	posted 10-16-2002 03:56 PM ET (US) Looking at the stern, the deadrise is the angle between the bottom of the hull and the horizontal. So, a flat bottom boat has no deadrise, and a canoe has lots of deadrise. In simple terms (from my simple mind), the more deadrise, the softer the ride (deeper V), but more roll at rest. Less deadrise means more pounding, but more stable at rest.
kingfish	posted 10-17-2002 09:32 AM ET (US) In addition to those considerations, less deadrise takes less power to plane and hold plane, so is more fuel-efficient and requires less horsepower for the same speed and weight. And less deadrise means shallower draft.
Bosmass	posted 10-17-2002 11:27 AM ET (US) Thanks, I will incorporate your notes when looking at and evauluating boats.
Got M Hooked	posted 10-27-2002 07:10 PM ET (US) Does anyone now the deadrise on a year 2000 Montak 17 ?
Tom W Clark	posted 10-27-2002 08:02 PM ET (US) Got M Hooked , It's kind of meaning less to use the term deadrise with a hull like a Montauk's. A Montauk does not have a deep-V hull nor does the central hull have a constant angle on it. The bottom of the hull is rounded so the angle you might measure is entirely dependent on exactly where on the hull you measure it. If you measure it adjacent to the keel it’s going to be zero degrees. The further from the keel you measure it the greater the angle. In spite of this, Whaler did have a specification for deadrise on their web site for the Montauk. How they came up with that number I have no idea. Doesn't really matter as it doesn't tell you much.
jimh	posted 10-27-2002 09:02 PM ET (US) Simply assessing the amount of deadrise on a hull is not much of a metric for deciding how well it rides. If you like to go bashing into head seas as fast as possible, get plenty of deadrise. That is what offshore race boat hulls have. If you want a well designed boat that is stable, rides well, planes with minimum power, and has proven characteristics, get a Classic Whaler.
latourfiveo	posted 10-28-2002 08:59 AM ET (US) This is one of the main reasons I tune in to this site, technical information like this. I had always wondered what deadrise was too, actually I thought I knew but was wrong. This site will make a sailer out of me yet! Keep up the good work Jimh and company! L50
Got M Hooked	posted 10-28-2002 09:15 AM ET (US) I was told that the new Montauk is flatter at the transom, compared to the classic hull, less deadrise, Is this true???