"Within" human powered ocean boat
Rick Willoughby had been designing and building human powered boats in Australia for over 10 years. He is an enthusiastic contributor and known authority with the online human powered boats community.
Leven Brown recently completely a trans Atlantic rowing expedition on his boat Columbus Run.
"Within" is a very narrow, self-righting single passenger human powered ocean boat. The hull is based on a sea kayak hull with slightly higher side walls, and a rounded top. To accomplish stability in rough sea conditions, weight is distributed very low in the vessel, and additional ballast in a keel will be suspended below the prop on the drive leg.
Water tight forward and rear compartments will ensure that the boat cannot sink, and the low center of gravity will ensure that it up-rights immediately upon a capsize.
A transparent dome is fitted on the retractable canopy top. The canopy top should be closed and sealed if the ocean conditions are rough which will allow the pedaling compartment to be mostly water tight and dry with adequate ventilation This should further increase safety in the event of a capsize, and will allow continued operation in rough seas. If ocean conditions are calm, then Within can be operated with the canopy in the retracted position. Scuppers with plugs or bilge pumps can be used to keep the pedaling compartment dry if it is being used with the canopy top retracted.
Steering is accomplished by standard kayak rudders and cables (not shown). Control of the rudder via access to the rudder cables is available from both the pedal station and from inside the sleeping compartment.
The drive leg will consist of standard cranks and pedals with two right-angle gear boxes connected by a shaft which will drive a two-bladed prop. The drive leg will be shrouded with a water-tight fairing.
This image shows one option for compartments. The rear compartment is water-tight when the door between the rear compartment and the pedaling station is closed. This could be used for some equipment and supplies storage as well as sleeping. A disadvantage of using this configuration to sleep, is the inconvenience of having to
The pedaling station would be water tight with the canopy top closed, and could have drain holes for allowing water to run out when operating with the canopy top open. If the boat is being operated with the canopy top open, it would be important to make sure that both hatches to the forward and rear compartments are closed and sealed, in the event of a capsize.
The forward compartment is water-tight and accessible through a hatch door. This would be where most of the food and equipment would be stored.
3 or 4 solar panels are fastened along the rounded top at the bow and stern which will provide electricity to charge batteries which will power the electronics and desalinator
Estimated weight of Within is between 1000 to 1500 pounds including supplies and ballast. I based this on some other ocean rowing expeditions:
Leven Browns supplies weighed 595 pounds (150 days).
Speed estimate based on 150W of power and an overall efficiency of 80% is about 5 knots (9 kph).
Construction photos and computer renderings: