Why 24deg.?

[PaulO]

I understand the concept of the 24 degree deadrise deep V hull. I was wondering why 24? If 24 is good - is more better? Why not? I have bever seen any boat advertised to have more than 24 deg. deadrise. Have there been any? Where they successful? Just stirring up some converstation here. A couple more good threads can get us through till spring!
PaulO

[GEOO]

Paul,
24 degrees is the basic standard for a good Deep V hull. Most belive it gives you the best ride without giving up too much speed & efficiency. I have seen a few manufactures make 24.5 and 25 degrees. http://www.contender.com/
How's the 20' CIG doing???
I should have my boat all set by Lake Cumberland, Hopefully I'll see you at Lake George.
GEOO

[PaulO]

George,
I will be picking up the cig. in 2 weeks. Can't wait. I forgot what it looks like. It's been a long winter. How is life with the baby? Is your wife enjoying it yet? Two months to go for our second! What have you been up to on the Donzi? Looking forward to seeing you at Lake george.
PaulO

[ALLAN BROWN]

OVER THE YEARS, WE HAVE BUILT FROM INVERTED V HULLS TO FLAT, TO 30 DEGREE VEES. 24 IS THE MAGIC NUMBER. MORE IS MORE COMFORT, LESS STABILTY. LESS IS MORE STABILITY, LESS COMFORT.

BROWNIE

[GEOO]

Paul,
Hailey and Mom (Heather) are doing well.
Two weeks you must be getting anxious. That's great!!
I needed to change some of the valve terrain. The springs were bottoming out with the high lift cam!! It's all set to drop back in the boat. GEOO

[This message has been edited by GEOO (edited 03-05-2001).]

[Len]

Paulo, keeping the "shape" in mind consider the fact that an 18' weighs about 2500 lbs for arguments sake. This means that when at rest in the water, the boat will need to displace about 250 gallons of water, a minute amount less if it is salt.(more dense) A cubic foot of water weighs about 62 1/2 lbs (Can and US weights) So during water use, with the exclusion of high speeds and planing etc, you always need to be moving/displacing about 40 cubic feet of water. This is where bottom design plays an important role when crawling around or at rest and/or at dock. Get in an 18-20 Boston Whaler and put 4 people on one side and look over the edge at "the big fish"...No problem, in fact it doesn't "scare" anyone. Now put the same 4 people on the side of the 18-20 Donzi/Cig to look at the "fish" and see how much more "sensitive" it is. The Whaler can displace it's weight without much movement due to the sheer square/cubic footage exposed/submersed in it's bottom design. The same weight to be "displaced" in an 18-20 Donzi/Cig basically heels it on the 24 degree mark, so the deadrise is parallel to the water and then it "sinks" to equate the cubic footage required for equilibrium. !!! http://www.donzi.net/ubb/eek.gif BUT http://www.donzi.net/ubb/eek.gif!!! The poor people in the Whaler at sea on an unpleasant day will have to use the washroom every 10 minutes, send out divers to look for their teeth and have Saline implants put in their asses! (I've owned three, never four).
As for "DESIGN"/strakes/lift characteristics/entry, sheer and chine properties,...go back to Brownie...(or someone that really knows what they are talking about... http://www.donzi.net/ubb/wink.gif

[This message has been edited by Len (edited 03-05-2001).]

[Frank Civitano]

There was a boat with a 26 degree dead rise. She was designed for the Florida to Bahama run and was a Solid boat for a 28 ft boat. The only problem was she was great in rough water but a slug at high speed. Sonics were built for the rough stuff. They cut the bottoms on the smaller boats to 23.

------------------
Frank Civitano

[BigGrizzly]

Len, Forget the engineering. You forgot to mention the saucer bottom like mine and the Knife entry like GeneD's. Like Brownie says its the magic number. Also this does not include the double steppers. My sone swears his will our ride mine. Point is for over 36 years the have been trying to improve on it and havn't yet. the biggest improvement has been the drives and horsepower, not the hulls. Look at Geeo, his boat is faster than the fastest boat in the 1969 Hennessey Grand Prix, or was it changed to Beny Hanna then.

Randy


[This message has been edited by BigGrizzly (edited 03-05-2001).]

[Len]

Steppers in civilian racing as early as 1910 ,...apparently

Earlier in pontoon designs on floatplanes
http://www.thunderboats.org/faststep.htm

...with a patent applied for in 1990 by Harry Schoell and law suits to follow against "todays" manufacturers...

http://www.delphion.com/cgi-bin/viewpat.cmd/US05456202__

...but, uhhh,...I don't know.
...Horace Dodge?....



[This message has been edited by Len (edited 03-07-2001).]