Page 113 - Practical Design Ships and Floating Structures
P. 113
88
-am-
2. - - slbO.26
CATA
--C- CATA Ill Shm -0.26
IN
r E - CATA 111 Deep 6-0.26 --D-- CATA 111 Deep &=0.26
-
.
2
OE; p ,,
om - -
425 -
a) Trim curves b) Sinkage curves
Figure 1 1 : Hull attitudes of CATA I11 for shallow and deep water (S/L = 0.26)
Figure 12 compares effective horsepower per unit displacement for CATA I, I1 and 111. The power
needed for CATAIII is apparently higher than those for CATA I and I1 as expected by considering the
fact that UBd of CATAIII is less than two thirds of the values for CATA I and 11. But comparing to a
catamaran of similar size operating at the open sea and selected for the comparison purpose, CAT111
requires similar power per unit displacement at the same design speed in spite of the fact that she is
designed to operates in the restricted water.
