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Boat Hull Design
A Lesson for Transportation Systems By Bill Bliss
Staying Afloat
• Basic principles • Components • Hull types • Hull description
How It Works
• Displacement Hulls
– Buoyancy defined
• Planning Hulls
– Hull is pushed up and on top – Hull skips across water
Components
• • • • •
Keel Bow Stern Strakes Rudder
Hull Types
• • • • • • • •
Flat-bottom Planing Round bottom Vee bottom Deep Vee Inflatable Tri-hull Pontoon
Flat-bottom Boats
• • • • • • Earliest form Stable in calm waters Rough ride under power Restricted power Unstable at speed Ideal fore shallow water
Most Common Uses
• • • •
John boats Skiffs Transports Shallow waterways
V Hull
• • • • •
Most common Good ride at speed Stable in rough water Soften the up and down movement May taper off to provide a planing surface at stern
Most Common Uses
• • • •
Fishing boats Recreation Military Work
Round Bottom
• • • • •
Easier to maneuver than flat-bottom Stable at midrange speeds More role in choppy water Some will use a keel Many smaller boats
Most Common Uses
• Sail boats • Dinghies • Canoes
Twin V Planning Hull
• Reaches plain quickly • Combines two or more smaller sub hulls • Gap and flat spots in-between the sub hulls are an ideal planning surface • Twin V hulls are stable at high speed • Stable in calm water • Efficient when on plain
Most Common Uses
• • • • • •
Catamarans Tunnel Vee Recreation Military Fishing Work
Hydro-foil
• Vary fast • Maneuverable • Wings • Military Hydro-foil
Deep Vee
• • • • •
Most stable in rough water Stable at speed Hard to plain V slices through waves Most used in open water
Most Common Uses
• • • • •
Open water boats Ships Fishing charters Work Military
Tri-Hull
• • • •
Stable when at rest Stable at speed Rough ride in choppy water Wide bow
Most Common Uses
• Personal water
craft
• Fishing
• Recreation
Pontoon & Inflatable
• • • • • •
Vary stable at rest Can’t sink it unless you pop it Stable at speed Vary maneuverable Large cargo space Light weight and portable
Most Common Uses
• • • • •
Dinghy Pontoon Recreation Rescue Fishing
Power Sources
• • • • •
Out board Inboard I/O Turbine Jet
Out Board
Inboard
I/O
Turbine
Jet Drive
The end…..