10 12 14 16 18 20
0 2 4 6 8
CR 103
EXP. DATA
L/1/3 = 4.66
10 15 20 25
L/1/3 = 5.08 L/1/3 = 5.74
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Fn
Figure 9: [C 932 – S/L = 0.36]
10 12 14 16 18 20
0 2 4 6 8
CR 103 L/1/3 = 4.66 EXP. DATA
0 5
0.10.2
10 15 20 25
L/1/3 = 5.08
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Fn
L/1/3 = 5.74 Figure 10: [C 932 – S/L = 0.41]
10 12 14 16
0 2 4 6 8
0.10.2
10 15 20 25
0 5
0.10.2 0.30.4 Figure 12: [C 925 – S/L = 0.24] 0.50.6 0.30.4 Figure 11: [C 925 – Demihull] CR 103 L/1/3 = 4.66 L/1/3 = 4.92
for Fn < 0.35 the differences between catamarans and demihulls are negligible;
around Fn = 0.35 ÷ 0.40 all catamaran and demihull configurations show a sudden increase of the trim;
Fn 0.7
for Fn > 0.40 catamarans of both models display an higher running trim than the demihull;
these trends increase when hull separation is reduced and displacement increased.
EXP. DATA CR 103 L/1/3 = 5.87 L/1/3 = 6.20 EXP. DATA
0 5
0.10.2 0.30.4 Figure 14: [C 925 – S/L = 0.36]
The previous figures show that:
0.50.6 0.30.4 Figure 13: [C 925 – S/L = 0.30] CR 103 L/1/3 = 4.66 EXP. DATA 0.50.6
CR 103 L/1/3 = 4.66
EXP. DATA
L/1/3 = 4.92
Fn 0.7
L/1/3 = 4.92 Fn 0.7
for Fn > 0.40 the curves become more regular and
for higher values of S/L ratio correspond smaller values of CR;
for Fn < 0.45 the curves relative to catamarans present more undulations with higher amplitude than demihull’s curves;
Fn 0.50.6 0.7
low value of L/1/3 amplify the phenomena above observed.
The interference phenomena, cause of these differences, will be evaluated in paragraph 4.4.
4.2 RUNNING TRIM
Regarding the running trim angles, next figures show that:
B-26
©2007: Royal Institution of Naval Architects
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