For years, diesel has been a common fuel for trucks, trains and ships. But its use in aircraft has been very limited. Some experts believe that diesel could benefit general aviation. They even argue that its widespread adoption could reduce carbon emissions.
Why is diesel not used in airplanes?
Diesel has the potential to offer better fuel efficiency than standard aviation fuels such as aviation gas and jet fuel. Tests on piston engines have shown that diesel can reduce fuel combustion by 10-15 percent. For small and light aircraft, this could help reduce costs.
Several aircraft manufacturers, such as Piper and Tecnam, have developed diesel-powered engine options. Diesel performs well at low altitudes and can compete with gas in terms of energy density. However, it is heavier and starts to wax at sub-zero temperatures, making it difficult to use in airplanes.
Diesel fuels developed for automotive use may not meet the needs of airplanes. Therefore, diesel formulations need to be developed for use in aircraft and engine systems need to be optimized.
Diesel-powered aviation is not favored today. But research believes that further progress could make this sector viable. With sustainable aviation fuel regulations becoming electrified, renewable diesel prices are likely to fall.
Regulators and pilots warn that diesel cannot replace standard fuels. It is banned for use in non-certified aircraft and can also damage engines.
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