Pointy-back bows ?

[Boo2]

Why ? I am referring to those bows that are over-plumb so to speak where it angles back instead of forward. Must be a reason for it... ?

Boo2

 

[sarabande]

they give you extended waterline length, fine entry into big seas, without the drawbacks of high polar inertia.

 

[flaming]

They also make digging the bow into the wave in front when going fast with the kite up less of an issue.

 

[Buck Turgidson]

I think a common name for the shape is Dreadnaught.
Saw a youtube vid from a cat designer who talked about it lowering the hydrodynamic drag caused by the water that climbs up the stem before dispersing.
Not an issue if you lift the bow out of the water scow style.

 

[Woodlouse]

For multihulls they are used to increase buoyancy in the bows to lessen the chance of pitch poling.

I think the benefits are less for a monohull. I remember reading one of the designers of the VO65's saying it was more for style rather than practical benefit on those boats.

 

[Bajansailor]

The US navy have adopted 'pointy back' bows on their latest Zumwalt class of destroyers :
https://en.wikipedia.org/wiki/Zumwalt-class_destroyer

The Polarcus seismic survey vessels also have 'pointy back' bows :
http://www.polarcus.com/geophysical-services/marine-acquisition/the-fleet/

 

[markhomer]

What goes round comes round ! , they aint called dreadnaught bows for nothing ,


What next , sails on supertankers

Return of the gaff rig , seen modern square tops ?

 

[JumbleDuck]

What next , sails on supertankers

 

[Norman_E]

That is more appropriate to this thread than you might think. The first of the sail assisted freighters built by in Japan was 26,000 DWT bulk carrier called Usuki Pioneer. The 1983 designed ship was also the first ship built with a long thin bulbous bow, as opposed to the fat bulb designs that had been in use for many years.