Cardboard boat building FAQ

It floats by displacement, exactly like any other boat. The submerged hull must push aside water weighing at least as much as the boat, crew, paddles, and cargo. A practical design encloses about twice that minimum volume to retain freeboard.

Capacity depends on enclosed hull volume, water density, freeboard, structure, and stability. In fresh water, each cubic foot displaced supports about 62.4 pounds. Use the Buoyancy Reckoner for a starting calculation.

Calculate displacement with the Buoyancy Reckoner →

Dry, undamaged corrugated board with continuous flutes is the usual starting point. Double-wall stock is stiffer than single-wall. Always follow the event's rules because waxed board, coatings, tape, or other materials may be restricted.

Within the race rules, builders slow water entry by guarding cut edges, making deliberate seams, and applying only permitted coatings. Cardboard remains vulnerable to water; the goal is a vessel that lasts through its intended race.

A wide beam, low center of gravity, even loading, sufficient reserve buoyancy, and transverse structure all help. A boat can have enough flotation and still capsize, so stability must be designed separately from capacity.

The yard accepts inquiries for commissions, consultation, build plans, and collaborative projects. Availability and scope depend on the race rules, schedule, crew, location, and transport constraints.

Yes, the yard accepts inquiries for educational programs, team-building fleet engagements, and charity regatta concepts. Water access, safety, permits, insurance, and qualified supervision must be handled appropriately for the venue.

The yard is based in Newburyport, Massachusetts, and serves inquiries from the North Shore, New England, and sufficiently compelling waters beyond.