Chapter 1 mangonel

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BDA 40203 - MECHANICAL ENGINEERING DESIGN 2UNIVERSITI TUN HUSSEIN ONN MALAYSIA

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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


Age : 24



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


Age : 24



Experience : Technician at YORK SDN BHD

Position : Project Engineer

Motto : Life with successful


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Name : Mohammad Zulkhairi Bin Ahmad


Age : 24



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



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




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6. Research and Development

i. Involve in report writing Conceptual Design



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

Chapter 1 mangonel

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