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Old 10-19-2010, 02:18 PM
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Default how to measure the deadrise at transom

to all very knowledgeable boaters i am wondering how to measure the deadrise of my boat i am guessing with a protractor but not sure any help would be appreciated it is a 1978 rabco 20' i just restored thanks in advance
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Old 10-19-2010, 03:08 PM
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Best way is with straight level picture of the transom and a protractor.
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Old 10-19-2010, 03:13 PM
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That or snap a level chalk line at the chines and use the protractor to get the angle. Or without a protractor, drop a vertical line at the center measure the 3 legs of the triangle you just formed and figure the angle with geometry.
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Old 10-19-2010, 04:44 PM
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Old 10-19-2010, 04:52 PM
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thats 12 degrees from the pic
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Old 10-19-2010, 05:14 PM
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I say less. More like 10-12
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Old 10-19-2010, 05:17 PM
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Just found my kids protractor. The answer is 12 deg.
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Old 10-19-2010, 05:20 PM
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definitely 10-24
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Old 10-19-2010, 05:26 PM
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Short of an angle finder or a protractor, remember the law of sines. sine 90/height=sine X/hypotenuse. Make sure boat is level (distance from each chine to the ground is equal), measure hypotenuse along hull bottom to common area on each chine (inside radius, say), hold a straight edge along keel such that dim.'s to each chine are the same at said radius, that gives you your height. Sine of 90 degrees is 1, so simply solve for X...or call Parker Rabb and ask him!
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Old 10-19-2010, 06:58 PM
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Pick up a cheap angle finder at the Home Despot
Check each side and aveage the 2
Doesn't matter if it is level
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Old 10-19-2010, 07:07 PM
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Every guy should own a speed square and you can use it do measure deadrise.
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Old 10-20-2010, 09:37 AM
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180 - minus [the angle of the V at your transom], divided by two.... so typical deep V might be 180- 135 = 45, divided by 2 = 22.5 deadrise.
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Old 10-20-2010, 10:15 AM
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Quote:
Originally Posted by nwboater2 View Post
180 - minus [the angle of the V at your transom], divided by two.... so typical deep V might be 180- 135 = 45, divided by 2 = 22.5 deadrise.
I used to copy off you in geometery class. Thanks.
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Old 10-20-2010, 11:23 AM
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Just lay a clear protractor on the picture above or any transom picture and read what it says. If the picture is not level you have to turn the protractor a little until you have same number on each side. Make sure you have the center zero line on the bottom of the keel. If you dont believe me try it on a picture of your own boat or others with a known deadrise.
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Old 10-20-2010, 05:15 PM
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Quote:
Originally Posted by Hawkeye View Post
Just found my kids protractor. The answer is 12 deg.
From the photo, my guess was 13 degree.
Close enough.
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Old 10-20-2010, 05:19 PM
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Definitely 11.75 or so
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Old 10-20-2010, 05:32 PM
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Definitely 11.75 or so
Damn!
You saying that I miised it by 1.25? My estimite.
I still say it's a 13 degree.
And I knew Randy quite well, 1964 or so.
In 1964, doe's anyone really think that anyone had any idea of what a transom deadrise was?
I absolutely promise you that Randy did not, nor me either.
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Old 10-20-2010, 05:37 PM
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Ok, 12.45; we'll compromise. Looks about the same as those Stamas hulls I like so well.....
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Old 10-20-2010, 05:52 PM
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Originally Posted by erie skipper View Post
Ok, 12.45; we'll compromise. Looks about the same as those Stamas hulls I like so well.....
Jim,
The entire discussion as to deadrise is very often, very misleading to the consumer.
My demo's are always a 13 degree, that's what I enjoy for the purpose.
My personal boat, the one that I make monthly payments on, 30', a 19 at the transom and I'm 100% satisfied with the boat for my purpose.
The first 24 degree at the transom was the "Damn Donzi" of Mr. Aronow's, my memory on that, and our company owns DONZI. That was, as I remember, 1964.
I have no wish, nor need for a 24 degree at the transom, none.
Way too much attention paid to deadrise at the transom.
Way too little attention paid to what the consumer wants, the consumers satisfaction with the consumers wishes at heart.
I cannot recall a hull that Randy built that was not a very good hull for it's purpose.
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Old 10-20-2010, 06:16 PM
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Quote:
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Ok, 12.45; we'll compromise. Looks about the same as those Stamas hulls I like so well.....
Well, my oldest son was the sales manager at STAMAS for something less than five years.
I've always thought that his gift for bad information came, for certain, the side of his mothers family.
Mr. Pete, a wonderful man, largest family land owners in Tarpon Springs, who made, and subscibes to the statement that "cell phones are only for rich people"? Ok, how doe's one argue that logic?
Mr. Pete Stamas is a one of a kind.
A man that will never be equalled.
A very fine man.
But also a Greek, another subject.
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