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US Navy Combatant, DTMB 5415

Hull data and conditions are as follows:

Main particulars, full scale
Lpp (m)	142.0
Lwl (m)	142.18
Bwl (m)	19.06
T (m)	6.15
Displacement (m3)	8424.4
S w/o rudder (m2)	2972.6
S of rudder (m2), each	30.8
CB	0.507
CM	0.821
LCB (%), fwd+	-0.683
GM (m)	1.95
Kxx/B	0.37
Kyy/Lpp = Kzz/Lpp	0.25

Service speed
U (knots)	18, 30
Fn	0.248, 0.413

Requested computations
Case	3.1a	3.1b	3.2	3.5	3.6
Experiments from	INSEAN	IIHR	INSEAN	IIHR	IIHR
Type of data	Mean velocity, wave pattern	Mean velocity, Reynolds stresses, wave pattern	Resistance, sinkage and trim	Mean velocity, Wave diffraction	Roll decay
References	3-1	3-2	3-1	3-2, 3-3	3-4
Scale factor	1:24.824	1:46.59	1:24.824	1:46.59	1:46.59
Lpp (m)	5.72	3.048	5.72	3.048	3.048
Speed (m/s)	2.097	1.53	1.046 - 2.097 - 3.071	1.53	0.7543
Froude number	0.28	0.28	0.138 - 0.28 - 0.41	0.28	0.138
Reynolds number	1.19x10^7	5.13x10^6	5.96x10^6 - 1.19x10^7 - 1.75x10^7	4.86x10^6	2.56x10^6
Bilge keel fitted	No	No	No	No	Yes
Sinkage s/Lpp	-1.82x10^-3	-1.92x10^-3	Free	-1.92x10^-3	2.93x10^-4
Trim [degrees]	-0.108	-0.136	Free	-0.136	-3.47x10^-2
Wave direction	Calm water	Calm water	Calm water	Head sea	Calm water
Degrees of freedom	FXσ τ	FXσ τ	FRz θ	FXσ τ	FRφ
Wave length λ/Lpp	-	-	-	1.5	-
Wave steepness [Ak=2πA/λ]	-	-	-	0.025	-
Wave frequency [s-^1Lpp/U]		-	-	1.16	-
Frequency of encounter [s^-1Lpp/U]	-	-	-	1.83	-
Initial roll angle [degrees]	-	-	-	-	10

Hull Attitude Definitions:

FX₀ = fixed at zero Sinkage and Trim

FX_{σ τ} = fixed at dynamic Sinkage and Trim

FR_{z θ} = free to heave and pitch

FR_{x z θ} = free to surge, heave and pitch

FR_φ = free to roll

Hull Geometry: cases 3.1a ; 3.2

Hull Geometry: cases 3.1b ; 3.5 ; 3.6

Bilge keel Geometry: case 3.6

Sinkage is defined using Z axis upwards and negative (-) trim values are nose down

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