Quick Answer
- It depends on the engine, not the helicopter. Turbine helicopters, such as the Robinson R66, Bell 407 and Airbus H130, run on Jet A or Jet A-1, a kerosene-type fuel also used by airliners.
- Piston helicopters, such as the Robinson R22 and R44, run on 100LL aviation gasoline (avgas), not jet fuel.
- The two fuels aren’t interchangeable. The wrong fuel can seriously damage an engine, so check the engine type before you fuel.
The honest answer is a rule: a helicopter’s fuel follows its engine. This guide explains why, what “helicopter fuel kerosene” means, and which real models use which fuel. For budgeting, our guide to helicopter fuel cost by model covers what operators pay per flight hour.
Why Does the Engine Decide the Fuel?
Civilian helicopters use one of two engine types. A turboshaft engine burns fuel continuously to spin a turbine, the same principle as a jet engine, but drives a rotor shaft instead of producing thrust. A piston engine, from the same design family as a car engine, ignites a fuel-air mixture in cylinders with a spark plug.
Those two methods need different fuels. Turboshaft engines run on kerosene-type jet fuel. Piston engines need high-octane gasoline that resists igniting too early as it is compressed.
What Is “Helicopter Fuel Kerosene”? Jet A and Jet A-1 Explained
When people search for helicopter fuel kerosene, they usually mean Jet A or Jet A-1. Both are refined kerosene-type turbine fuels, and a turbine helicopter doesn’t use a special helicopter-only fuel. It burns the same Jet A-1 that fuels a commercial airliner. For grades and composition, see what aviation fuel is.
The two grades differ in two ways. According to Wikipedia’s jet fuel entry, Jet A freezes at -40 °C and Jet A-1 at -47 °C, and Jet A-1 normally contains a static dissipator additive.
What About Piston Helicopters? Avgas Explained
Piston helicopters run on aviation gasoline, commonly 100LL, a 100-octane leaded fuel. The octane rating matters because a piston engine compresses the mixture before ignition, and low-octane fuel can ignite prematurely, a fault called detonation that can damage the engine.
Unleaded options exist for some models. Flying magazine reported in 2023 that some Robinson models are approved for lower-octane unleaded fuels, but the R44 Raven II is not.
Which Helicopters Use Which Fuel?
| Helicopter | Engine | Fuel |
|---|---|---|
| Robinson R22 / R44 | Lycoming piston | Avgas (100LL) |
| Robinson R66 | Rolls-Royce RR300 turboshaft | Jet A / Jet A-1 |
| Bell 407 | Rolls-Royce M250-C47 turboshaft | Jet A / Jet A-1 |
| Airbus H130 | Safran Arriel 2D turboshaft | Jet A / Jet A-1 |
The split follows the engine, not the manufacturer. Robinson builds a piston model, the R44, and a turbine model, the R66, and they run on different fuels.
What Happens If You Put the Wrong Fuel In?
It is a safety-critical mistake. Jet fuel is formulated for continuous turbine combustion, so in a piston engine it can cause serious damage or failure. Avgas is also the wrong fuel for a turbine engine, so check the flight manual.
Safeguards exist. AOPA notes that jet fuel trucks use a wide, spade-shaped nozzle designed not to fit a piston aircraft’s smaller filler port. The same article stresses they aren’t foolproof, and that a mix of 100LL and Jet A can still look blue. That is why professional line crews match the aircraft to the fuel before the nozzle connects.
Frequently Asked Questions
Do all helicopters use jet fuel?
No. Only turbine (turboshaft) helicopters use jet fuel, Jet A or Jet A-1. Piston-engine helicopters run on aviation gasoline (avgas), an entirely different fuel.
What fuel do helicopters use?
It depends on the engine. The Airbus H130 and Bell 407, both common commercial and charter models, are turbine helicopters that run on Jet A or Jet A-1. The Robinson R22 and R44 are piston helicopters that run on 100LL avgas.
Is helicopter fuel kerosene?
For turbine helicopters, yes. Jet A and Jet A-1 are kerosene-type fuels, refined to aviation turbine fuel specifications rather than household kerosene grades.
Can a helicopter run on regular car gasoline?
Generally no. Some piston models are approved for certain unleaded aviation fuels, but that is a specific, certified approval, and pump gasoline isn’t one of them.
How much does helicopter fuel cost to burn?
It depends on the model’s fuel burn and the fuel price at the time. Our page on helicopter fuel cost by model compares the R66, Bell 407 and H130.
Check What Your Helicopter Costs to Fuel
See what operators pay per flight hour, or talk to us about aviation fuel supply.