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MECHANICAL

ENGINEERING DESIGN

( HOVERCRAFT)

PREPARED BY:

1. MD ISA MAHADIANSHAH BIN MOHAMAD (2011699278)

2. MOHD NOR AFIFI ASHRAF BIN AHMAD (2011160809)

3. ISHAMNURDIN BIN ISMAIL (2011961839)

4. NUR ASIAH BINTI KUZAIMAN (2011541135)

5. NUR DIANA BINTI BORHANUDDIN (2011978665)



INTRODUCTION

• A hovercraft, also known as an air-cushion vehicle

or ACV, is a craft capable of travelling over land,

water, mud or ice and other surfaces both at speed

and when stationary.

• Hovercraft ride much smoother than boats

because they travel over the surface of the water,

not through it. It travels over water with no

concern for depth or hidden obstacles.



PROBLEM STATEMENT

• The purpose of this project is to practice and to

apply the knowledge in mechanical design and to

gain better understanding in mechanical design

process

• It is conceivable that someday all watercraft will

use the hovercraft principal due to its many

advantages.



OBJECTIVES

To design a hovercraft based onthe product design specification.

To design a well-designedhovercraft which requires lessdrag and horsepower to operate.

To develop a hovercraft whichworks well in rapids and whitewater making it an excellent

watercraft.



SCOPE

OF

PROJECT

To designhovercraft

and improveits features.

To complete the

design within 8weeks time.

Power pointpresentation

overviewing overallprocess

Final reportthat coveredall the details

of the design



CONFIGURATION DESIGN



HULL/BASE

• Material : Brown

Fibre

• Dimension : 1.22 m

X 2.41m• Quantity : 1

• Cost : RM 750

•

Joining process :Mechanical fastener

(bolt and nut)

Platform which sustains the entire

weight of the craft.



CHASSIS

• Material :

Polyethylene

•

Size : 1.22” X 2.41” • Cost : RM 900

• Weight : 170kg

• Joining Process :

Mechanical fastener

(Bolt and nut)

Consists of an internal framework that

supports a man-made object in its

construction and use.



SKIRT

Material : Nylon

Size : 7 Meter

Cost : RM 616

Quantity : 1

Joining Process :

StaplingEnables a hovercraft to maintain its normal

operating speed through large waves



PROPELLER

Material : 6061

Aluminium Alloy

Size : 3” X 6” Quantity : (6

blades)

Cost : RM 1200

Joining process :Welding

Its purpose is to pull (or push) the aircraft

forward through the air.



CHAIR

• Material : Plastic

• Size : Standart

• Quantity : 1

• Cost : RM 30

• Joining process :

Snap fitFor passenger’s comfort



ENGINE

• Material : Nikasil(Nickel matrix siliconcarbide)

• Weight : 36 kg

•

Performance: 60 HP• Max. torque: 84 Nm

• Cooling: water cooling

• Quantity : 1

•

Cost : RM 1400• Joining process :

Mechanical Fastener(bolt n nut)

Blows air backwards which providesan equal reaction that causes the

craft to move forward.



STEERING

• Material : Mild steel

coated with nylon

plastic

• Diameter : 0.37”

• Quantity : 1

• Cost : RM 30

• Joining process :Mechanical fastener

(bolt and nut)

Change in direction



FINN

• Material : 6061

Aluminum alloy

• Size : 2” X 1”

• Quantity : 2

• Cost : RM 400

• Joining process :

Mechanicalfastener (bolt and

nut)



FINAL DESIGN



EXPLODED VIEW



SIMULATION

Maximum Von Mises stress = 7.93x104Nm-2.Its shows that by using plastic as the material are the best choice

because plastic has approximate Young’s Modulus about 2.20 x109

Nm-2 which does not exceed the maximum value of stress of the

plastic can stand.



DETAILS ANALYSIS OF CALCULATION

Engine = 36kgHuman factor = 70 kg

Base = 241.2 kg

Chassis = 4373 kg

Total Structure = 4373 kg + 241.2 kg= 4614.2 kg

Base surface area = 4feet x 8 feet

= 1.22 m x 2.44 m

= 2.97 m2

Engine Force , Fengine = engine mass x gravity

= 36 kg x 9.81 m/s¬2

= 353.16 N



Human Force, Fhuman = human mass x gravity

= 70 kg x 9.81 m/s2

= 686.7 N

Structure force, Fstructure = total structure mass x gravity

= (4373 kg + 241.2 kg) x 9.81 m/s2

= 45.27 kN

Required Lift Force, Flift = Fengine + Fhuman + Fstructure

= 353.16 N +686.7 N + 45.27kN

= 46.31 kN

Assuming that the thrust force is equal to half of the lift force,

Required Thrust Force, Fthrust = Flift / 2

= 46.31kN / 2

= 23.16 Kn

Air Pressure, Pair = Flift / A

= 46.31 kN / 2.97 m2

= 15.59 kPa



FAILURE MODE AND EFFECTS ANALYSIS (FMEA) RANKING





FAILURE MODE AND EFFECTS ANALYSIS

(FMEA)





MATERIAL

COST

OVERHEAD

COST

TOTAL

COST



No Part Quantity Price/unit Total price (RM)

1. Body Wide = 1.22 m

Length = 2.41 m

Per ton= 4800 900.00

2. Hull Wide = 1.22 m

Length = 2.41 m

Per ft2 = 55.00 750.00

2. Skirt

7m

Per meter = 88.00 616.00

3. Engine: 3502 E/V

1

1400.00 1400.00

4. Propeller Wide = 6

Length = 3

Blades = 6

Per sq ft = 180 1200.00

5. Steering Diameter = 0.37m 250.00

6. Fin Wide = 2ft

Length = 1ft

Per sq ft = 180 400

7. Chair 1 30.00 30.00

Total 5546.00



No Type Cost per unit. RM

1. Workers 100.00

2. Manufacturing Process 100.00

3. Transportation 30.00

Total 230.00

List of overhead cost

Hence,

Total cost = material cost + overhead cost

Total cost = RM 5546 + RM 230 = RM 5776



CONCLUSION

• Hovercraft is a year-round vehicle that can make thetransition from land to water without touching the

surface.

• In a hovercraft system,engine provides both the lift

cushion and the thrust for forward or reversemovement powers it.

• Rising fuel prices and shortages are making the

hovercraft a desirable form of transportation.

• One must take under consideration the weight and the

shape of each component in order to avoid problems

such as instability and dysfunction.