# Watertaxi-3rd project presentation-BUET

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• 1. BANGLADESH UNIVERSITY OF ENGINEERING & TECHNOLOGY
NAME 338
SHIP DESIGN PROJECT & PRESENTATION-3
DATE-18 ,April,2011

2. DESIGN OF A WATER TAXI FOR 100 PASSENGERS in SADARGHAT-ASHULIA ROUTE
Project Supervisor
KhabirulHaqueChowdhury
Professor
Department of Naval Architecture & Marine Engineering,BUET
Presented By-
Hasib-Ul-Haque (0712014)
3. OBJECTIVES
To use the circular water ways around Dhaka city
To ease the water way communication with comfortable service
To reduce the pressure on land transport.
To safe people from horrible traffic jam.
4. PRINCIPAL PARTICULARS
LENGTH:
OVERALL: 24.90 meter
Load water line : 24.122 meter
L.B.P : 22.95 meter
MAXIMUM: 6.5 meter
MOULDED: 6.3 meter
DEPTH(MLD) :2.0 meter
DRAFT(MLD) :1.1 meter
5. PRESENTATION TOPICS
1.Rudder design.
2.Engine selection and foundation.
3.GA and Lines plan update
4.Weight calculation update
5.Hydrostatic calculation update
6. Trim and Stability update
6. Rudder Design-Calculation from GL
8. Steering Arrangement
9. Resistance & Power CalculationHoltrop Mennen Method
RT = RF(1+K1) + RAPP + RW + RB + RTR + RA
Where,

• RF = Frictional resistance according to ITTC 1957 friction formula

10. (1+K1) = Form factor describing the viscous resistance of the hull form in relation to RF 11. RAPP = Appendage resistance 12. RW = Wave making and wave breaking resistance 13. RB = Additional pressure resistance due to bulbous bow near the water surface 14. RTR = Additional pressure resistance of immersed transom stern 15. RA = Model ship correlation resistance
16. Resistance & Power Calculation
For our ship we get,
RF= 4.6430 KN
(1+K1) = 1.22
RAPP = 0.1417 KN
RW= 9.0478 KN
RB = 0
RTR = 0
RA = 1.7609 KN
So, RT = 16.6149 KN
Effective power,PE = RT V
= 16.6149 12 0.5149
= 102.65 KW = 137.68 HP
17. Resistance & Power Calculation
Shaft Power,Ps= PE/[ R 0s(1-t)/(1-w)] = 188.19 HP
Delivered Power,PD= s Ps= 0.99 188.19 = 186.31 HP
Break horse power = PS/ G = 194.01 HP
Where,
G= gear efficiency = 97%
18. Engine Selection
Yanmar type 4JH4-HTE
19. Engine Selection
Steyr Motor Engines-M0114K33
20. Why we select Yanmar type 4JH4-HTE??
The Yanmar type 4JH4-HTE Engine is designed for high performance.
The innovative fuel injection technology enables an excellent torque and speed range.
Service Life-this engine is manufactured using high alloy materials to provide enduring longevity for all running components.
Comfort-The patented 2-stage UNIT Injector fuel injection technology provides for a worldwide approped and smooth operation noise
Exhaust Emissions-The trend-setting UNIT INJECTOR system enables us already today to conform with the valid emission regulations.
Transmission-this engine allow the installation with different driving system in our boat.
21. Power
Yanmar type 4JH4-HTE
Steyr Motor Engines-M0114K33
22. Fuel Consumption
Yanmar type 4JH4-HTE
Steyr Motor Engines-M0114K33
23. Torque
Yanmar type 4JH4-HTE
Steyr Motor Engines-M0114K33
24. Engine Dimension
Aft view
Right View
25. Engine Specification
26. Engine Foundation
30. Equipments
31. VARIANCE IN DATA
32. GAUpdate
33. MODIFICATION OF GENERAL ARRANGEMENT
1.Canteen facility has been cancelled
4.Seating arrangement has been renovated and updated
5.Change in Cabin type,size and position
34. Comparison between GA plans
GA-Updated
GA-Previous
35. Lines Plan Update
No of person on board:
No of passenger = 100
No of crew = 6
Total = 106
Weight allowance per person:
Weight per person = 75 kg
Luggage per person = 5 kg
Total = 80 kg
Total weight for persons = 80 106
= 8.48 tons
38. Capacity calculation
39. Summery from Capacity Calculation
41. Lightweightcalculation
42. SHELL EXPANSION
43. Longitudinal
44. CALCULATION OF WEIGHT OF PLATES
45. weight of other items
46. WEIGHT OF OTHER ITEMS
47. MISCELLANEOUS : 2 TONNE
48. So,the total lightweight of the vessel is = (9.47+47.93) tons
= 57.4 tons
Therefore,
the displacement of the vessel= Lightweight+Deadweight
= 57.4 + 17.48
= 74.88 tons
Which was previously 123.48 tons
49. HYDROSTATIC UPDATE
50. 51. Hydrostatic Parameters
52. Form coefficient
53. Longitudinal centre of buoyancy
Updated
Previous
54. Longitudinal metacentre
Updated
Previous
55. Transverse metacentre
Updated
Previous
56. Displacement
Updated
Previous
57. Water plane coefficient
Updated
Previous
58. Prismatic coefficient
Updated
Previous
59. Vertical centre of buoyancy
Updated
Previous
60. Block coefficient
Updated
Previous
61. Midship section coefficient
Updated
Previous
62. Longitudinal centre of flotation
Previous
Updated
63. MCT 1m
Previous
64. MCT 1m
Updated
65. STABILITY CALCULATION
66. GZ SAMPLE CALCULATION AT 30INCLINATION
67. GZ SAMPLE CALCULATION AT 30 INCLINATION
V.C.G from keel= 1.31 m
KB = 0.69 m
68. GZ CURVE
69. TRIM UPDATE

• LCB At LWL = 0.72 m aft of amidship

70. LCG of total ship = 0.93 m aft of amidship 71. Displacement of the Ship = 74.68tonneAt LWL,

• MCT1m = 141.16 tonne-m

72. C.F.= 1.08 m aft of amidship 73. Draft = 1.1 m[The value of LCB,MCT1m,C.F. are taken from the Hydrostatic Calculations earlier in the design procedure]
74. TRIM UPDATE
Now,
Amount of Trim={(0.93-0.72)*74.68}/141.16
= 0.1111 mby stern
So,
Change in Trim aft= 0.05 m
Change in Trim Forward= 0.061 m
Therefore, resulting
Draft Forward= 1.1-0.061 = 1.039 m
Draft Aft= 1.1+0.05 = 1.15 m

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