20170421

Bow Rocker

Feeling that the bow of H3 was way too low, I measured the bow rocker of a couple of flat-bottomed pram hulls. The bow rocker of my H3 design is only 15 degrees compared to about 20-25 degrees for conventional designs. I think H3 may be very wet and slow to windward. Since Norwegian prams and vlet hulls are reputed for their seaworthiness I decided to rework the Hatseflats design and raise the bow rocker from 22 degrees to 24-25 degrees.

The table below indicates the average bow rocker of existing designs:

Designer	Design	Length	Bow rocker
Vivier	3.7m	Laita	25
Vivier	5.49m	Seil	25
Bolger	app 3m	Auray Punt	24
Bolger	3.8m	Japanese Beach Cruiser	14
Chapelle	2.7m	Lapstrake Pram	25
Harris	app 3.8m	Passagemaker Dinghy	22
Traditional	Dutch Schouw	5.5m	25
Christian Nielsen	Lokken Pram	5.5m	25