US Navy Combatant, DTMB 5415
Hull data and conditions are as follows:
Main particulars |
Full scale |
|
| Length between perpendiculars | LPP (m) | 142.0 |
| Length of waterline | LWL (m) | 142.18 |
| Maximum beam of waterline | BWL (m) | 19.06 |
| Draft | T (m) | 6.15 |
| Displacement | &Delta (m3 ) | 8424.4 |
| Wetted area w/o rudder | SW (m2 ) | 2972.6 |
| Wetted surface area of rudder | SR (m2 ) | 30.8 |
| Block coefficient (CB) | &Delta /(LPPBWL T) | 0.507 |
| Midship section coefficient (CM) | 0.821 | |
| LCB (%LPP), fwd+ | -0.683 | |
| Vertical Center of Gravity (from keel) | KG (m) | 7.5473 |
| Metacentric height | GM (m) | 1.95 |
| Moment of Inertia | Kxx/B | 0.37 |
| Moment of Inertia | Kyy/LPP, Kzz/LPP | 0.25 |
Service speed |
|
| U (knots) | 18.0, 30.0 |
| 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, Resistance, Wave Pattern |
Mean velocity, Resistance, Wave Pattern, Reynolds stresses |
Resistance, Sinkage and Trim |
Wave diffraction, Mean velocity |
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 |
1.19x107 |
5.13x106 |
5.96x106 - 1.19x107 - 1.75x107 |
4.86x106 |
2.56x106 |
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
FXσ τ = fixed at dynamic Sinkage and Trim
FRz θ = free to heave and pitch
FRx z θ = free to surge, heave and pitch
FRφ = free to roll
Hull Geometry: cases 3.1a ; 3.2
Sinkage is defined using Z axis upwards and negative (-) trim values are nose down