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Happy Osprey — MEG4 Tanker Loaded Benchmark

IMO 9553646 · Wind 50 kn / Current 3 kn Fixed 90° · MEG4_Tanker_Loaded coefficients · Draft — benchmark validation only, not an official MSMP

Required warnings (per benchmark specification):

This is a benchmark validation calculation — NOT an official MSMP approval calculation.
Tanker coefficient set is a user-selected engineering benchmark (manual override: Yes).
Actual berth water depth not recorded. Wd/T = 3.00 is a benchmark assumption. Implied Wd = 28.50 m.
Coefficient set status is verified_anchors_only; engineering approval required before official use.
DDS-582-1 is NOT used in this calculation.

BENCHMARK PASS

All coefficient and force validation checks passed. Result is ready for independent checking.

HAPPY_OSPREY_MEG4_TANKER_LOADED_BENCHMARK_V1

27/08/2026, 14:00:29

Draft - benchmark validation for independent review

B. Vessel Data

VesselHappy Osprey

IMO9553646

StandardMEG4

LoadingLoaded

Ship type (MEG4)tanker

LBP / Lref134.44 m

Draft T9.5 m

A_T Wind426 m²

A_L Wind1435 m²

A_T Current1277.18 m²

A_L Current4612 m²

Wd/T3

Implied Wd28.5 m

Water depth basis: Fallback benchmark value — actual berth water depth not recorded

C. Coefficient Selection

Wind tableMEG4_Tanker_Loaded_Wind

Current tableMEG4_Tanker_Loaded_Current

Selection basisUser-selected engineering benchmark

Manual overrideYES

Eng. approval req.Yes

Standard MEG4 tanker loaded coefficients selected intentionally for benchmark. Vessel is commercially an LPG-type vessel, but the MEG4 gas-carrier coefficient family is not applicable at this vessel size. Tanker coefficients are the most appropriate MEG4 basis. This is a benchmark validation calculation, not an official MSMP.

G. Dynamic Pressures

V_wind25.7222 m/s (exp ~25.7222)

q_air405.249 N/m² (exp ~405.249)

V_current1.5433 m/s (exp ~1.5433)

q_water1220.710 N/m² (exp ~1220.710)

H. Critical Coefficient Validation — MEG4_Tanker_Loaded_Current @ 90° / Wd/T = 3.00

Coefficient lookup

Cxc_at_90

exp: 0.0220 | 0.02200✓

Cyc_at_90

exp: 1.0620 | 1.06200✓

Cxyc_at_90

exp: 0.0000 | 0.00000✓

✓ Cyc = 1.06200 (corrected — was wrongly 1.320 before fix)

Current forces @ fixed 90°

Fx_current

exp: ~34.30 | 34.299 kN✓

Fy_current

exp: ~5978.97 | 5978.970 kN✓

Mz_current

exp: ~0.00 | 0.000 kN✓

Fail indicator: if Fy_current ~7431.49 kN → old Cyc=1.320 still in use.

J. Governing / Worst-Case Forces

Max Ahead (max Fx)101.63 kN @ 105°

Max Astern (min Fx)-98.63 kN @ 0°

Max Port Sway (max Fy)6429.66 kN @ 75°

Max Stbd SwayN/A — all Fy_total ≥ 0

Max |Mz|5081.78 kNm @ 60°

Max Resultant [kN]6430.041 kN

Max Resultant [mt]655.6820 mt

Governing wind angle75° app

Current angle (fixed)90° app

Max Starboard Sway: Not applicable — no negative Fy_total in this scenario. Fixed current at 90° always gives positive Fy contribution.

K+L+M. Expected vs Actual & Validation

Expected max resultant~6430.04 kN (~655.68 mt)

App max resultant6430.041 kN (655.6820 mt)

Difference0.001 kN

Tolerance±30 kN

Resultant check: PASS

Fail indicator: if app resultant ~7882 kN → old Cyc=1.320 still in use.

Tolerance is ±30 kN (wider because 15° sweep grid vs continuous maximum).

⚠ Max Starboard Sway: Not applicable - no negative Fy_total occurred in this scenario (all sweep rows have Fy_total >= 0 because fixed current at 90 deg always contributes positive Fy).

I. Full 360° Sweep Table (24 rows)

O. Full Calculation Trace

Export for Independent Checking

PDF includes full calculation trace, formula substitution, sweep table, and pass/fail validation. CSV contains all 24 sweep rows with coefficient and force data.

Status: Draft - benchmark validation for independent review