Astounding technological development

[Ben]

According to Progression Powerboats of Long Island N.Y, they have come up with a totally radical new hull design - the variable deadrise hull. Now why hasn't anyone thought of this before.

http://www.progressionboats.com/home...tom_detail.jpg

[Jon Fuller]

Don't ya just love the Marketing boys!

[JamesM]

So whats that suposed to do then?

[Jon Fuller]

It's not unusual at all, my P28 has it, the ring/Extreme 24/26 has it. It just has a shallower deadrise along the centreline, which makes for a faster boat, but has an increasing deadrise (deeper 'V') toward the chines, so when it roughs up, you still get some of the benefit of the softer but slower 'deep'V'' hull form.

It's not rocket science, and certainly aint new!

[jw.]

Aye, but on that pic, it's the other way around.

[jw.]

Originally posted by Matt
It has a pad too.

Isn't that just a step to effectively shorten the hull a little?

[Jon Fuller]

Originally posted by jw.
Aye, but on that pic, it's the other way around.

By gad you're right! I must have had a blonde moment! mebbe I should look at the pic before I open my gob next time, I'd better take any bad things I said back

I bet thats odd at speed in a turn! you'd think it would 'high side' and be over like a shot

[glen76]

thats not the same as a warped hull is it? thats front to back yes??

[Jon Fuller]

Originally posted by glen76
thats not the same as a warped hull is it? thats front to back yes??

Yup

[Ben]

DEADRISE- Measurement of the angle between the bottom of the vessel and it's widest beam. A vessel with a 0` deadrise has a flat bottom, high numbers indicate deep V shaped hulls.

And to further illuminate - complicate matters

http://www.nautica.it/superyacht/501/tecnica/bottom.htm