Page 120 - Practical Design Ships and Floating Structures

95

4 CONCLUSIONS
On the basis of above analysis stated over, It can concluded that
1. Along with the advance of technology and appearance of new ship types, the tunneled stern presents
some defects such as lower propulsive factor, etc. So it isn’t best cargo ship types again in Wujiang,
a typical waterways with shallow and strong current.
2. Although ship types of twin stem is higher wake, it isn’t fit to apply in shallow and strong current
because of lower D/T.
3. In order to increase the diameter of propeller and improve propulsive performance, tunneled
combined with twin-stern is a better ship types having high performance in shallow and strong
current.

+tunneled stern +tunneled combined with twin-stern
I I

.. . . . . ..

- .____~... L 1 ZOO0
. . .. . . .
oii $1.’ ,I_)> tlI
rn 0. I 0. 13 0 15
Fn

Figure 3: WD -Fn curves in deep water Figure4: IUD -Fn curves in shallow water

0.272 0.287 0.303
Fn
Figure5: k -En curves of two afterbodys
References
1. Long Fanyi.( 1989). Test Research of Twin-stern in Changjiang River. Technology Intercourse ofship
Design 1,9-15.
2.Li Shim0 ,Wang Dexun and Chen qiuzhi(l991).Test Research of Speed Performance of New Motor
Barges in Shallow and Rapid current. Journal of Wuhan Transportation University 20:4,211-217.
3.Wuhan Transportation University( 1995) and Bureau of Inland Navigation in Guizhou Province. The
Reports of Ship Transportation Form and Development of New Ship Types. 19-26.