Helicopter Aerodynamic Power Required & Fuel Burn Calculator
Calculate induced, profile, and parasite power curves, bucket airspeed, and hourly fuel burn (L/hr & GPH).
Last reviewed by the myCalculator Editorial Team
Input Parameters
Calculation Results
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Formula & How Helicopter Aerodynamic Power Required & Fuel Burn Calculator Works
A helicopter's power required follows a bucket-shaped curve: high in the hover because of induced power, dropping to a minimum around 50 to 70 knots as translational lift develops, and rising again at high speed from parasite drag. Fuel flow follows power, so cruising near the best-range speed saves fuel. Mission fuel is the hourly burn multiplied by flight time, plus reserves: a helicopter burning 60 L per hour for a 2-hour flight needs 120 L, with a reserve on top as required by the regulations. Weight, density altitude and speed all change the burn. Use the aircraft's flight manual figures for real planning and treat the calculator as a learning tool.
- Enter Helicopter Model Preset: Input your target parameter value.
- Enter Cruise Forward Airspeed (KIAS) (KIAS): Input your target parameter value.
- Enter Helicopter Weight (kg) (kg): Input your target parameter value.
- Enter Planned Flight Duration (Hours) (hrs): Input your target parameter value.
- Apply Formula: Calculate using
Total Power = P_induced (translational lift) + P_profile + P_parasite (V³) | Mission Fuel = Hourly Burn × Flight Hours. - Review Results: View exact computed answers, metrics, and worked mathematical proofs.
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Frequently Asked Questions (FAQs)
What is the bucket speed on a helicopter power curve?
The 'bucket' speed is the airspeed at the bottom of the power curve (usually 50–65 knots) where total power required is at its absolute minimum. Flying at this speed gives the maximum endurance (longest time aloft).
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Authoritative Standards & Verified Reference Citations
Calculations and mathematical logic on this page are grounded in published statutory rules, regulatory standards, and official government data published by the following bodies:
CASR Part 91 general operating and flight rules, Part 121 fuel reserves, and flight crew licensing standards.
Aviation weather services, standard atmosphere (ISA) profiles, METAR/TAF aerodrome weather reports.
Aeronautical Information Publication (AIP), En Route Supplement Australia (ERSA), and airspace procedures.
CASA Navigation theory practice for RPL, PPL and CPL students, including compass, variation, track, wind and flight-planning topics.
Jandakot-based rotary and fixed-wing operations unit — real-world reference for helicopter performance and mission profiles.
Australia's largest aeromedical operator — 79 aircraft across 23 bases delivering emergency and primary healthcare to remote Australia.
NSW Police airborne support unit operating Bell 429 and Bell 412EPI helicopters for search, surveillance and rescue operations.
Victoria Police's aviation support unit, operating since 1975.
QPS Aviation Capability Group — police helicopter and fixed-wing operations across Queensland.
AW139 rescue helicopter fleet operating from Belmont, Tamworth and Lismore bases across Northern NSW.
Queensland-based rescue helicopter and aeromedical retrieval service, operating since 1979.
South Australia's specialist emergency medical retrieval and aeromedical service.
Operational Scenario
Operational Scenario: Headwind Stronger Than Forecast on a Marginal-Range Leg
You planned Bathurst (YBTH) to Coonabarabran (YCBB) then Moree (YMOR), about 2 h 50 min in total, in a Cessna 182 by day VFR, carrying trip fuel plus the 30-minute final reserve. Levelling at cruise you find a 25 kt headwind rather than the forecast 10 kt. At the first fuel check overhead Coonabarabran, fuel remaining is 15 minutes below plan and the gap is widening each leg.
Practical Decisions
- •Plan to land with the final reserve untouched (CASR Part 91 MOS chapter 19): 30 minutes for a piston or turboprop aeroplane of 5,700 kg or less by day VFR; 45 minutes by night VFR or IFR; 20 minutes for a helicopter by VFR.
- •Recalculate at the groundspeed you are actually achieving: fuel to destination at the observed headwind, compared with fuel remaining minus the final reserve.
- •Nominate an en-route aerodrome for a fuel diversion and set the trigger before you need it — "if fuel remaining reaches X litres at this point, divert".
- •Log a fuel check at every waypoint: time, fuel remaining, fuel used against plan, and revised endurance. A written trend makes the divert decision obvious.
Knowledge Check
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