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Mr. Sandman · 08-07-2006, 09:03 AM

I think I can help you. (I work in the field of ship design (marine hydrodynamics specifically)) As MM said, deadrise is the angle of the V on your hull. More deadrise =deeper V= softer ride in waves. For example a Regulator has about 24 deg of deadrise at the transom, this is a considered a deep V hull and it handels the chop nicely. The old Boston Whalers were nearly flat bottoms and were back breakers. (They adopted deep deadrise hulls nowadays) Most boats have variable deadrise, steep in the bow to deal with waves and flattening in the stern to help with the roll. Depending on the hullform, the roll issue can be delt with with with subtle design line mods. IMO around here the more deadrise the better, but you will pay for this with added fuel costs and deeper draft. The most efficient planing hull is a flat plate. However a flat plate rides like hell in a chop. So, basically, deadrise helps soften the ride in waves. I would not be so concerned about the roll issue as most boats flatten out the stern lines near the chines and this provides a lot of roll damping and a clean separation line.

Hope this helps.

08-07-2006, 09:03 AM	#3
Mr. Sandman Registered User iTrader: (0) Join Date: Sep 2001 Posts: 7,649	I think I can help you. (I work in the field of ship design (marine hydrodynamics specifically)) As MM said, deadrise is the angle of the V on your hull. More deadrise =deeper V= softer ride in waves. For example a Regulator has about 24 deg of deadrise at the transom, this is a considered a deep V hull and it handels the chop nicely. The old Boston Whalers were nearly flat bottoms and were back breakers. (They adopted deep deadrise hulls nowadays) Most boats have variable deadrise, steep in the bow to deal with waves and flattening in the stern to help with the roll. Depending on the hullform, the roll issue can be delt with with with subtle design line mods. IMO around here the more deadrise the better, but you will pay for this with added fuel costs and deeper draft. The most efficient planing hull is a flat plate. However a flat plate rides like hell in a chop. So, basically, deadrise helps soften the ride in waves. I would not be so concerned about the roll issue as most boats flatten out the stern lines near the chines and this provides a lot of roll damping and a clean separation line. Hope this helps.