ONR Tumblehome Ship (ONRT)
Hull data and conditions are as follows:
Main particulars |
Model scale |
Full scale |
|
| Length of waterline | LWL (m) | 3.147 | 154.0 |
| Maximum beam of waterline | BWL (m) | 0.384 | 18.78 |
| Depth | D (m) | 0.266 | 14.5 |
| Draft | T (m) | 0.112 | 5.494 |
| Displacement | Δ | 72.6 kg | 8507 ton |
| Wetted surface area (fully appended) | S0 (m2 ) | 1.5 | NA |
| Block coefficient (CB) | ∇ /(LWLBWL T) | 0.535 | 0.535 |
| LCB | LCB (m) aft of FP | 1.625 | NA |
| Vertical Center of Gravity (from keel) | KG (m) | 0.156 | NA |
| Metacentric height | GM (m) | 0.0422 | NA |
| Moment of Inertia | Kxx/B | 0.444 | 0.444 |
| Moment of Inertia | Kyy/LWL, Kzz/LWL | 0.246 | 0.25 |
| Propeller diameter | DP (m) | 0.1066 | NA |
| Propeller center, long. location (from FP) | x/LWL | 0.9267 | NA |
| Propeller center, lateral location (from CL) | ±y/LWL | 0.02661 | NA |
| Propeller center, vert. location (below WL) | -z/LWL | 0.03565 | NA |
| Propeller shaft angle (downward positive) | ε (deg.) | 5 | NA |
| Propeller rotation direction (view from stern) | inward | inward | |
| Maximum rudder rate | 35.0 deg./s | ||
Model speed |
|
| U (m/s) | 1.11 |
| Fn | 0.20 |
Requested computations |
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Case # |
3.9 |
3.12 |
3.13 |
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Wave |
Calm* |
Head* |
-45°, Beam, -135°*, |
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Condition |
Free-run |
Free-run |
Free-run |
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Attitude |
FRall |
FRall |
FRall |
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Validation Variables |
Thrust, torque, prop fact, s&t, Model point |
Thrust, torque, rpm, motion, speed loss, speed loss |
Thrust, torque, rpm, motion, speed loss, speed loss |
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EFD provider |
IIHR |
IIHR |
IIHR |
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| "Mandatory" cases (denoted by *) |
| For ONRT the calm water and head waves should be computed first. |
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Hull Attitude Definitions: |
|
Hull Geometry (with gaps above the rudders) Hull Geometry (without gaps above the rudders) Propeller Geometry + Propeller Open Water Characteristics(IIHR) |