Project Title:

Design and Fabrication of

Hovercraft

Group Members:Shahbaz Hussain 2014-ME-353Murtaza Sabir 2014-ME-

366Umar Izhar 2014-ME-365Hamza Saleem 2014-ME-

351Hafiz Muhammad Umar 2014-ME-394

Outline of Presentation: Introduction Models Elements of a typical hovercraft Design configuration Operation of hovercraft Cost factors Project completion statistics use of hovercraft Results Conclusion

Introduction:

What is Hovercraft ?An hovercraft is a typical vehicle that

can move with equal ease on water as well as on the ground. It is also known air cushion vehicle.

Models:1. SRN1:

The first practicalModel to be made. ItWas powered by one(piston) engine, driven by expelled air and could carry little more than its own weight and two men.

Models:

2. SRN2 AND SRN6:Other developments led to larger and more

efficient hovercrafts that can carry more passengers as compared to SRN1.

3. Vickers VA-3:This was first true pass

engers carrying Hovercraft.

Elements of Hovercraft Hull:

This is where the driver operates the hovercraft. It is the base for attaching other parts.

Lifting System:This consists of the a centrifugal pump attached to the

engine or motor and it provides the cavity underneath the craft and also for filling the skirts.

Elements of Hovercraft Thrust System:

This consists of the propeller that moves air from in front of the craft and accelerates it out the back. This accelerated mass then pushes the craft forward.

Skirt:This is the flexible wall that is attached all

around the bottom of the craft. This skirt prevents the pressurized air from escaping from the chamber.

Elements of Hovercraft Engine:

Its main function is to supply power to the propeller.

Control system:This consists of the rudders that steer the craft

by directing the air from thrust system toward either left or right.

Design Configuration With two engines, one for propulsion and other for

lift.

They can be designed with one engine to perform lift as well as propulsion by directing some of the air to the skirt and rest to the back for thrust.

D.C Motors:

Specifications of Battery:

Design Considerations Carrying Capacity:

An hovercraft with large overall area can carry more weight than smaller one with same fan. Therefore the should be kept as large as possible. Aerodynamic drag:

Aerodynamic drag is the force that the thrust must overcome. This force can be reduced by reducing frontal area. Thrust:

the propellers used must overcome the aerodynamic drag. Stability:

the location of the various components and loads so as not to overload any particular area which may make the craft unstable.

Operation of the Hovercraft The lift fan pushes a large amount of air under the hovercraft

resulting the rise of pressure.

As the pressure exceeds the weight of the hovercraft the

hovercraft begins to lift off the ground.

Eventually the pressure under the hovercraft raises high enough

to lift the skirt off the ground.

Equilibrium is reached At the specific point when

the forced air into the cushion is equal to the air

leaving the skirt.

At this stage Hover is hovering at its maximum

height.

Operation of the Hovercraft

Material List and Detail:

Cost Factors*:Material Quantity Material costThermopore Sheets 2 200DC Motors 10,000 RPM 1 1000DC Motor 7000 RPM 1 600Skirt Material 1 1100Keel Plywood 1 120 per running footLipo Battery 2 2000Propellers 3 600Controller 1 Not Specified Yet

* Rough Calculation

Usage of hovercraft Personal use. Search and rescue in oceans and rivers. Mass transportation (Vehicles, goods). Recreational purposes. Research and military uses.

Conclusion The hovercraft is in operation today throughout the

world for a variety of purposes and its use is growing giving raise to new and improved designs resulting in greater applications.

With its safety and adaptability, it can become one of the most important and economical means of transport in future.