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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)
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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.
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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.
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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.
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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
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CONFIGURATION DESIGN
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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.
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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.
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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
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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.
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CHAIR
• Material : Plastic
• Size : Standart
• Quantity : 1
• Cost : RM 30
• Joining process :
Snap fitFor passenger’s comfort
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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.
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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
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FINN
• Material : 6061
Aluminum alloy
• Size : 2” X 1”
• Quantity : 2
• Cost : RM 400
• Joining process :
Mechanicalfastener (bolt and
nut)
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FINAL DESIGN
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EXPLODED VIEW
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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.
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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
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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
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FAILURE MODE AND EFFECTS ANALYSIS (FMEA) RANKING
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FAILURE MODE AND EFFECTS ANALYSIS
(FMEA)
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MATERIAL
COST
OVERHEAD
COST
TOTAL
COST
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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
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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
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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.