chapter 1 mangonel
TRANSCRIPT
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CHAPTER 1 : INTRODUCTION
1.1 PRODUCT BACKGROUND
The Mangonel is what many people think of when they think of a catapult. From the Latin word
"manganon" meaning engine of war. The Mangonel was invented by the Romans in 400 BC. The
Mangonel consists of a long wood arm with a bucket (early models used a sling) with a rope
attached to the end. The arm is then pulled back (from natural 90 o angle) then energy was stored
in the tension of the rope and the arm. Then the bucket would be loaded. When released the
Mangonel's arm would return to its equilibrium position, when it came in contact with the beam
the arm would stop but the missiles stored in the bucket would continue to launch toward the
enemy. The Mangonel fired projectiles in an overhead arc, the angle of the path of the projectile
could be determined by a block placed on the beam that stopped the Mangonel's arm by using a
block that stopped the arm earlier than 90 o angle would result in a path angle (above the
horizontal) equal to the the angle between the arm and the 90 o angle. The Mangonel was capable
of firing 1,300 ft. The Mangonel was easy to construct and wheels were added to the design to
increase mobility.
Figure 1.1 : The model of mangonel catapult
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Based on the entire characteristic and the criteria of the mangonel catapult, we have to
form a group and create our own mangonel catapult to fulfill the project of Design II subject. The
mangonel has to fulfill the condition of the project which is the requirement has been given the
size of the mangonel that should be followed. There are fundamental principles to invent the new
mangonel and necessary to take into consideration important factor such as weight, design, type
of material and the correct angle to get the long distance results.
1.2 PROBLEM FOR EXISTING PRODUCT
As we knew that mangonel is the invention from 400 BC so there are many problem that we can
see from this original catapult. Major disadvantage of a mangonel are the inconsistent accuracy
because of the material that chose to build the catapult. Most of the original catapult use twisted
rope as the material to throw the projectile. Ropes can lose their elasticity so the accuracy of the
catapult are not too accurate and it cannot survive a long distance of the thrown projectile.
Figure 1.2 : Twisted ropes that used by original catapults
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1.3 PRODUCT SIGNIFICANCE
To obtain the objective and the design specification of this project, a new design of
mangonel catapult must be designed. In the new design of the mangonel, we will consider about
the design, safety, ergonomic, dimension and type of material that used. This mangonel catapult
will produce the long range of thrown projectile than the original catapult. This mangonel also
will use the new design and new type of material that also will help to get the good distance
when the projectile will be thrown.
1.4 PROJECT OBJECTIVE
The objectives of this project are;
1) To comply with Design II Subject requirement to create an Mangonel Catapult
2) To be qualified in the Mangonel tournament held by Design II Subject
3) To study the mechanical analysis of the design
4) To study the history of ancient weapon use in medieval
5) To build the mangonel based on the qualities of long range effort and Ergonomic
1.5 PROJECT SCOPE
To finish this project require a scope of work and a systematic plan should be conducted and
follow because this project must go through a various process before we produce it. The scopes
for this project are:
i) To lift a maximum weight of 5kg load.
ii) To throw the load with a range between 5 meter to 10 meter.
iii) The size of Mangonel ranges between 30 x 30 x 35 cm
iv) All the design is made by 3D modelling by using solid works software.
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1.6.1 Profile Of Members
Name : Mohd Munir Mahfuz Bin Md Nasir
Matric No. : CD 110392
Age : 23
Education : - Diploma in Mechanical (Polytechnic)
- Bachelor in Mechanical Engineering and Manufacturing (UTHM)
Experience : Technician at OYL SDN. BHD
Position : Project leader
Motto : Learn more get more
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Name : Syahril Bin Abdul Razak
Matric No. : CD 110320
Age : 24
Education : - Diploma in Mechanical (Polytechnic)
- Bachelor in Mechanical Engineering and Manufacturing (UTHM)
Experience : Technician at MTBE/Polypropylene PETRONAS Malaysia SDN BHD
Position : Project designer
Motto : Follow the flow
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Name : Ahmad Syakir Bin Mohamad Jamil
Matric No. : CD 110319
Age : 24
Education : - Diploma in Mechanical (Polytechnic)
- Bachelor in Mechanical Engineering and Manufacturing (UTHM)
Experience : Technician at YORK SDN BHD
Position : Project Engineer
Motto : Life with successful
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Name : Mohammad Zulkhairi Bin Ahmad
Matric No. : CD 110352
Age : 24
Education : - Diploma in Mechanical (Polytechnic)
- Bachelor in Mechanical Engineering and Manufacturing (UTHM)
Experience : Technician at Semambu Engineering SDN BHD (S.E.S)
Position : Research and Delopment
Motto : Live Big, Breath Deep
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Name : Mohd Aidil Janatun Bin Razali
Matric No . : CD 110366
Age : 24
Education : - Diploma in Mechanical (Polytechnic)
- Bachelor in Mechanical Engineering and Manufacturing (UTHM)
Experience : Technician at ENC Teguh SDN BHD
Position : Mechanical Engineer
Motto : Impossible is nothing
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1.6.2 ORGANIZATION OF COMBINED GROUP I-MECH & WARLOCK
Chart 2: Group Organizational Chart
PROJECTLEADER
MUHAMMADAZHAR
DESIGN
SHAHROLHILMI
NADZARUDDIN
TECHNICALAIDIL JANATUN
RIDHWAN
AZIZAN
RESEARCH
AHMAD SYAKIR
ZULKHAIRI
TREASURER
SYAHRIL
PROJECT
ASSISTANTMUNIR MAHFUZ
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1.7 DESIGN PROCESS
Design process is most important with engineering designs to classified as inventions-devices or
systems that are created by human effort and did not exist before or are improvement over
existing device or systems. Inventions, or designs, do not suddenly appear from nowhere. They
are result from design process is bringing together technologies to meet human needs or to solve
the problems.
Figure 3: Pahl and Beitzs Design Process Model
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1.8 GENERAL TASK DELEGATION
The followings show the task delegation for each team members (Combined Group):
1. Project Leader
i. Acting group leader for both mini groups and project manager.
ii. Responsible in delegating tasks to all group members
iii. Involved in report writing Conceptual Design
iv. Involve in concept idea
2. Project Assistant
i. Acting secretary for both mini groups.
ii. Involved in report writing Introduction and Summary
iii. Recording minute meeting
3. Design
i. Involve in report writing Define Task
ii. Involve in designing concept of the productiii. Involve in concept idea
4. Treasurer
i. Involve in report writing Introduction and Summary
ii. Involve in designing concept of the product
iii. Involve in concept idea
5. Technical
i. Involve in report writing Embodiment Design and Analysis
ii. Involve in designing concept of the product
iii. Involve in concept idea
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6. Research and Development
i. Involve in report writing Conceptual Design
ii. Involve in designing concept of the product
iii. Involve in concept idea
1.9 PROJECT PLANNING AND SCHEDULING
Table 1: Project Planning Gantt chart
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1.9.1 BUDGET SCHEDULING
Table 2: Budget Scheduling
1.9.2 Overall Cost Estimation
Table 3: Overall Cost Estimation
No Type Dimension Description Price
1 Angle iron 1 x 1 Thick RM 100
2 Bolt, Nut and Washer 4/8 x 1 &
4/8 x 3/2
3 unit RM 1 per
unit
3 Solid wood beam 1 x 1 Thick RM 50
Bil Component Initial cost Costing By
Progress
1. Structure Rm 150 Rm 200
2. Accessories Rm 150 Rm 200
Overall cost Rm 300 Rm 400