HYDROFOILS HOVERCRAFTS WHO KNOWS WHAT A HYDROFOIL IS

HYDROFOILS & HOVERCRAFTS

WHO KNOWS WHAT A HYDROFOIL IS?

WHAT IS A HYDROFOIL ? • A Foil is another word for a wing. • A Hydrofoil is simply a wing that “flies” in the water. • Hydrofoils let a boat go faster by getting the hull out of the water.

HISTORY OF A HYDORFOIL • The first Hydrofoil vessel was built in 1905 by the Italian engineer Enrico Forlanini. • In 1918, Alexander Graham Bell built the HD-4, a hydrofoil vessel 60 ft long which attained a speed of 70. 86 mph. BELL – HD-4

HOW DOES IT WORK? • When a boat moves forward, most of the energy used goes to moving the water out of the way. • The Hydrofoils special design lifts the hull of the boat out of the water to reduce the drag, which increases speed and fuel efficiency.

HOW DOES IT WORK? • Hydrofoils lift the watercraft the same way that airplane wings keep the plane supported. • Foils create lift when the water traveling over the top goes faster than the water traveling over the bottom • Where there is faster velocity, there is lower pressure.

HOW DOES IT WORK? • The higher pressure on the bottom of the foil causes the lifting force needed. • The lift can be optimized by positioning the hydrofoil at an angle (angle of attack).

COMMERCIAL USES • Cargo Vessels: • Passenger Vessels: • Military Vessels:

RECREATIONAL USES • Sailing: • Wakeboarding: • Air Chairs:

WHO KNOWS WHAT A HOVERCRAFT IS?

WHAT IS A HOVERCRAFT? • A Hovercraft is a vehicle supported on a cushion of air supplied by a powered fan mounted on the back of the vehicle. • AKA: Air Cushion Vehicle (ACV).

HOW DOES A HOVERCRAFT WORK? • A Hovercraft is powered by a motor, which drives a fan. – The bigger the vessel the bigger the motor and fan needed. • The fan creates the thrust to drive the Hovercraft forward

HOW DOES A HOVERCRAFT WORK? • Part of the fan thrust is ducted through the hull to lift the craft off the surface on a cushion of air. • The air is held under the craft by a flexible skirt which keeps the air cushion pressure up.

HISTORY OF THE HOVERCRAFT • The first recorded design for an air cushion vehicle was put forward by Swedish designer and philosopher, Emmanual Swedenborg in 1716.

HISTORY OF THE HOVERCRAFT • The first hovercraft was built by Christopher Cockerell in 1956. SRN 1

HISTORY OF THE HOVERCRAFT • The theory behind the Hovercraft was originally tested in 1955 using an empty cat food tin inside a coffee tin, an industrial air blower and a pair of kitchen scales.

WHAT IS SO SPECIAL ABOUT A HOVERCRAFT? • What makes a Hovercraft so unique is the fact that it can travel over any surface, as long as it is relatively smooth. EX: Water, Grass, Ice and Snow.

WHAT IS SO SPECIAL ABOUT HOVERCRAFTS? • Hovercrafts can be used year round due to their unique design. • They are used for: – Sports – Recreation – Utility/Commercial – Rescue Purposes

SPORTS / RECREATIONAL USES • Cruising • Hunting • Fishing • Touring

COMMERCIAL USES • Hovercrafts are mainly used as icebreakers, ferrying crafts and hauling vehicles. • Its primary use of commercial hovercrafts is hauling. It is sometimes used instead of barges or ocean line due to maneuverability and versatility

RESCUE USES • The versatility of the Hovercraft allows it to be used in most rescue operations – Flooded areas, mud, ice, sandbars, swamps and other dangerous surfaces Hoverguard 700 Hoverguard 1000

ANY QUESTIONS?