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Orbit Propagation Calculator: Kepler, J2 Drift and Satellite Passes
Propagate orbital elements with Kepler’s equation and secular J2 drift. Animate a ground track and predict observer elevation, rise, peak and set times.
CNC Axis Drive Sizing: Ballscrew, Belt, Stepper and Servo
Size CNC axis force, ballscrew or belt torque, reflected inertia, stepper and servo capacity. Check cutting loads, rapids, screw critical speed, buckling and command resolution.
Cable Pulling Tension, Sidewall Pressure, Jam Ratio & Fill
Calculate section-by-section cable pulling tension in both directions, bend sidewall pressure, three-cable jam ratio and conduit fill. Compare friction, cable limits and pull-line ratings.
Washing Machine Floor Vibration and Isolation Pads Calculator
Simulate washing machine spin vibration on timber joists. Compare isolation pads, a mass block, sistering and blocking using a coupled machine–floor model.
Aircraft Takeoff Weight: Mission Fuel Fraction Sizing
Estimate aircraft takeoff mass from payload, mission range and loiter. Compare jet, propeller and battery electric designs, with empty weight iteration and growth sensitivities.
Formation Flight: Induced Drag Savings in a V
Solve coupled lifting lines for birds, drones or aircraft in a V or echelon. Find wingtip overlap, compare each position and estimate fixed-wing electric endurance.
Home EV Charging Losses: Level 1 vs Level 2 and Cold Weather
Compare wall energy, charging time and annual cost at 120 V/12 A and 240 V/16–48 A, including charger part-load losses, vehicle overhead, battery heating and current.
4-Hour Battery vs Gas Peaker: Levelized Cost of Peak Capacity
Compare four-hour battery storage with a gas peaker in $/kW-year and $/MWh. Model peak-event duration, charging losses, degradation, augmentation, and equal-service battery sizing.
Sand Battery Under a Slab: Storage, Losses and Floor Temperature
Model a year of heat conduction through an under-slab sand battery. Compare stored PV heat, ground and edge losses, January floor temperature, insulation and sand depth.
Pool Heat Pump Cost per Day: With and Without a Cover
Compare daily pool heating cost, evaporation and water temperature with and without a cover. Model hourly weather, heat pump performance and a chosen heating run time.
Dual Fuel Heat Pump Switchover: Gas, Oil or Propane
Find economic and capacity balance temperatures, then compare winter cost and CO₂ for a heat pump with resistance backup, dual fuel, and a furnace using editable local weather bins.
120 V vs 230 V: House Wiring, Copper, Losses and Voltage Drop
Compare identical household loads on split phase, single phase and three phase. Size conductors, count copper, and calculate annual wire and transformer losses.
Electric Shock: Body Current and IEC 60479 AC/DC Zones
Estimate voltage-dependent body current, compare AC and DC shock zones, and explore RCD clearing and IT earth-contact transients.
Rotating Disc & Ring: Stress, Growth and Burst Speed
Calculate centrifugal stress, radial growth, shrink-fit separation and burst speed for a solid disc or ring with variable thickness and an optional thermal gradient.
LDO vs Buck Converter: Efficiency, Heat, Ripple and Noise
Compare an LDO, synchronous buck and buck followed by an LDO. Calculate losses, junction temperature, PFM ripple, PSRR filtering and battery runtime, with a voltage–load selection map.
ESC Capacitor Sizing: Lead Inductance, Spikes and Ripple
Simulate ESC battery lead ringing and switching spikes. Size an electrolytic bank with board ceramics using RMS ripple current, voltage margin and estimated heating.
Ball Screw Axis Sizing: Motor Torque, Screw Limits and Parts
Size a ball screw linear axis with a closed-loop NEMA stepper or an integrated servo: torque over the whole move against the motor's curve, critical speed, buckling, nut life, screw length and a priced parts list.
Truck Depot Charging: Grid, Battery Buffer and Schedule
Optimize truck charging against a limited grid connection. Size the battery buffer, compare EDF scheduling, and check every departure SOC and demand charge.
BESS Container Spacing and Radiant Heat
Calculate fire radiation, transient wall and cell heating, and separation distance for neighbouring BESS containers. Compare open exposure with a heated barrier wall.
Sodium-Ion vs LFP: Cold Storage Capacity and Lifetime Cost
Compare sodium-ion and LFP home batteries or BESS through simulated cold discharge, charging limits, efficiency, enclosure size and discounted lifetime cost.
R290 Heat Pump Charge, Room Size and Leak Concentration
Compare R290 charge limits by floor area and installation height. Explore a hole leak, floor accumulation, air changes and detector response, with R32 sizing alongside.
Home Battery Dynamic Tariff: Savings and Payback After 2027
Simulate a year of PV, household demand and dynamic prices. Compare net metering, self-consumption and optimized home battery dispatch, including negative prices, grid charging and payback.
Solid-State Transformer: MV to 800 V DC, Modules and Efficiency
Size an MV-to-800 V DC modular SST, sweep four SiC voltage classes, and compare detailed CHB, DAB and transformer losses with a conventional power chain.
800 V DC Arc Flash: Capacitor Discharge and Incident Energy
Solve capacitor discharge and current-limited source contributions to a DC arc. Compare incident energy with Doan’s screen and find a clearing-time bound for 1.2 cal/cm².
