For Calculators & Data Sheets (Engines & Prime Movers), I’d make it a “toolbox” page that feels like a proper engineer’s console: quick inputs at the top, results instantly, and each tool links to a matching data sheet / reference card underneath.
Page layout (MaritimeHub-style)
- Top strip: “Most used” calculators (6–10 tiles) + search bar
- Tabs: Engines | Generators | Fuel & Emissions | Air & Starting | Cooling | Lube Oil | Performance | Electrical/Hybrid
- Each tool section: Calculator + Worked Example + Downloadable data sheet + Common faults
- Right column: ads + “Quick reference” cards (units, conversions, alarm limits)
Must-have calculators (Engines & Prime Movers)
A) Core engine performance
- Power / Torque / RPM converter (kW ↔ HP ↔ BHP, Torque Nm)
- SFOC / Fuel burn (g/kWh → kg/h, t/day at load)
- Load % / MCR calculator (actual kW vs MCR)
- Propeller law calculator (P ∝ n³, Q ∝ n², speed relationships)
- Cylinder power balance (indicator/EGT proxy) (simple balancing tool)
- Brake mean effective pressure (BMEP) (4-stroke + 2-stroke variants)
B) Fuel, energy, and emissions
- CO₂ emissions from fuel burn (t/day → tCO₂/day; voyage total)
- NOx “tier awareness” helper (not a cert tool—just operational guidance)
- LNG / methanol / MGO energy equivalence (LHV-based comparison)
- Fuel blending / viscosity / temperature (HFO/MGO changeover assistant)
- CII / EEOI rough calculator (operational estimate)
C) Starting air / combustion air (big for marine)
- Starting air receiver sizing / endurance (starts available at pressure range)
- Air consumption per start (rule-of-thumb + manufacturer input option)
- Scavenge air pressure/boost sanity checks
- Turbocharger compressor ΔT / efficiency quick check (basic)
D) Cooling system
- Heat rejection estimate (from fuel energy → JW/SW load split)
- Cooler duty / flow rate (Q = m·Cp·ΔT)
- Expansion tank / header tank volume
- Glycol mix ratio (freeze point, corrosion protection)
E) Lube oil and filtration
- Oil pump flow vs pressure sanity tool
- Bearing clearance “risk band” helper (input clearance → warning band)
- Centrifuge throughput / settling time
- Filter ΔP trend tracker (log + alarm threshold suggestions)
F) Generators & prime movers (electrical side)
- kVA ↔ kW ↔ PF calculator
- Load sharing / droop calculator (simple % sharing)
- Cable sizing quick check (basic current + derating assumptions)
- Battery bank sizing (starter batteries + hybrid ESS basics)
- Harmonics / VFD “rules of thumb” card (not deep analysis, just field guidance)
G) Compression & diagnostics
- Compression ratio / compression pressure estimator (rule-of-thumb)
- Exhaust temperature deviation alarm tool (per-cylinder variance)
- Vibration severity quick check (ISO-style reference card, not certification)
Data sheets (what should be downloadable / viewable)
1) “Operating limits” cards (gold for engineers)
- Normal ranges and alarms for:
- LO pressure/temperature
- JW in/out temperatures
- Exhaust temp ranges (and delta between cylinders)
- Scavenge pressure
- Start air pressures
- Fuel supply pressures (common rail + mechanical)
- Include: Normal / Caution / Trip bands
2) “Prime mover one-pagers”
For each engine type (2-stroke slow speed, 4-stroke medium, high-speed genset):
- Cycle basics + timing overview
- Key components & failure modes
- Typical maintenance intervals
- Common alarms + what they mean
- Quick troubleshooting flow (start / smoke / power / LO / temp)
3) Fuel property sheets (engine-room practical)
- LHV, density, viscosity @ temp, flash point, pour point
- Changeover notes (thermal shock, viscosity controller)
- Compatibility notes (cat fines, water, microbial)
4) Hybrid/electric quick references (if you’re including those sections)
- Battery chemistries (LFP/NMC) pros/cons
- ESS safety checklist (thermal runaway signs, ventilation)
- DC bus vs AC bus “what changes for faults”
- Shore power checklist (sync, interlocks, earthing)
5) “Conversions & constants”
- kW/hp, kWh→MJ, bar/psi, °C/°F
- Cp values for water/glycol
- CO₂ factors by fuel type (clearly labeled as estimates)
“Make it feel live” features (high impact)
- Save as PDF button for each data sheet
- Logbook mode: store last 20 runs (inputs/results) per calculator
- Share link: generates a URL with pre-filled values (handy onboard)
- Trend widgets: paste 7 days of readings → auto flags abnormal drift
- Model presets: “MAN B&W 6S60”, “Wärtsilä 46”, “CAT 3516” (you can add over time)
What I’d put on the actual page (sections)
- Featured calculators (tiles)
- All calculators A–G (accordion list)
- Data sheets library (filterable cards)
- Quick reference (sticky right column)
- Changelog (engineers love knowing what changed)