Sylvie Willis
The use of diesel fuel in aircraft engines has been a topic of interest and debate for several decades. While diesel-powered aircraft engines exist and can run on diesel fuel, the use of diesel in aviation is not common. Historically, diesel-powered engines were specifically built for planes, and diesel fuel was favoured for its low fire risk. However, today, most commercial and jet aircraft do not use diesel fuel. This is mainly due to the low power-to-mass ratio of diesel engines, which can impact payload capacity. Additionally, diesel engines are heavier and more susceptible to cold temperatures, requiring the use of additives. Nevertheless, some general aviation aircraft, such as the Piper PA-28 and Tecnam P2010 TDI, offer diesel-powered models, and there has been a recent resurgence in aircraft diesel engine production due to the rising costs and environmental concerns associated with other types of fuel.
| Characteristics | Values |
|---|---|
| Can planes use diesel fuel? | Yes, diesel aircraft engines can run on diesel fuel. |
| History of diesel use in aircraft | Diesel-powered aircraft engines were first used in airships in the late 1920s and 1930s. The first successful flight of a diesel-powered aircraft was on September 18, 1928. |
| Advantages of diesel fuel | Excellent specific fuel consumption, reduced flammability, higher fuel density, better for the environment and human health than avgas. |
| Disadvantages of diesel fuel | Heavy engines, low power-to-mass ratio, reduced payload capacity, susceptible to colder temperatures. |
| Alternative fuels for aircraft | Aviation biofuel, synthetic fuel, liquified natural gas (LNG), hydrogen, sustainable aviation fuel, straight vegetable oils, jet fuel. |
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What You'll Learn
Aircraft engines can run on diesel fuel
The first successful flight of a diesel-powered aircraft occurred in 1928, and diesel engines were preferred for flights under 6-7 hours in the 1930s. The use of diesel in aircraft engines offered advantages such as reduced flammability, higher fuel density, and better fuel consumption. However, diesel engines were heavier and had a lower power-to-mass ratio, which became a crucial factor for aircraft. With technological advancements, some on-road diesel engines have been successfully converted and certified for aircraft use.
While it is possible for aircraft engines to run on diesel fuel, it is essential to consider the engine's design and recommended fuel. Using incompatible fuel can lead to reduced performance or even engine damage. Aircraft engines are typically designed with specific fuel requirements in mind, and the use of diesel fuel should align with the manufacturer's specifications.
In recent times, the general aviation (GA) market in the US has primarily used low-lead avgas or Jet-A engines. However, there are some GA aircraft certified by the FAA that can accept diesel, such as the Tecnam P2010 TDI. Additionally, the popular single-engine plane Piper PA-28 offers a diesel-powered model.
The use of diesel fuel in aircraft engines has advantages and disadvantages. On the one hand, diesel engines offer better fuel efficiency and are more environmentally friendly due to reduced toxicity and pollution. On the other hand, diesel fuel is heavier, more susceptible to colder temperatures, and may require additives to mitigate these issues.
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Diesel fuel is not commonly used in planes
While it is true that diesel aircraft engines can run on diesel fuel, it is not a common practice. Historically, diesel-powered engines were specifically built for planes by more than one engine manufacturer. In the late 1920s and 1930s, aircraft diesel engines were used in airships and aircraft, but they never gained widespread adoption until recently.
One of the main advantages of diesel engines is their excellent specific fuel consumption, reduced flammability, and higher fuel density. However, these advantages are outweighed by inherent disadvantages compared to gasoline-fueled or turboprop engines. Diesel engines are typically heavier, and as they produce more power, they also become heavier, which is a significant disadvantage for aircraft. Additionally, diesel is more susceptible to colder temperatures, requiring the use of additives that may not always be available or suitable for the specific diesel batch.
The use of diesel engines in aircraft also has environmental and health benefits, as the tetraethyllead antiknock ingredient in avgas is highly toxic and polluting. With the rising costs of avgas and concerns about its future availability, there has been a resurgence in aircraft diesel engine production since the early 2010s. Despite these factors, diesel-powered aircraft engines remain uncommon, especially in commercial aviation.
It is important to note that using the wrong type of fuel in an aircraft engine can have severe consequences. Aircraft engines are designed with specific fuels in mind, and using incompatible fuel can reduce engine performance or even damage the engine. Therefore, it is crucial to follow the manufacturer's recommendations for the type of fuel to be used.
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Diesel engines were used in airships in the 1920s and 1930s
While diesel fuel is not used in modern aircraft engines, diesel engines were used in airships in the 1920s and 1930s. Airships, also known as dirigible balloons or blimps, are large gas balloons that can be steered using engine-driven propellers. They are powered by gases that are lighter than air, such as hydrogen and helium.
In the 1920s and 1930s, several companies manufactured diesel engines for aircraft, including the Packard radial diesel, which was produced from 1928 to 1929. The first successful flight of a diesel-powered aircraft took place on September 18, 1928, in a Stinson model SM-1DX Detroiter. The aircraft diesel engine, also known as aero diesel, offered several advantages over gasoline-powered engines, including superior fuel consumption, reduced flammability, and higher fuel density.
The use of diesel engines in airships was particularly advantageous due to the low flammability of diesel fuel compared to gasoline. This was a significant concern for airships, as almost all of them used highly flammable hydrogen as a lifting gas during this period. Notable airships that employed diesel engines include the LZ 129 Hindenburg and the LZ 130 Graf Zeppelin II. The Hindenburg utilized a Daimler-Benz diesel engine, which proved unsuitable for military applications due to its lack of maneuverability.
The two-stroke Junkers Jumo 205 opposed-piston engine, which entered service in the early 1930s, was widely used in airship applications. It found success in the Blohm & Voss Ha 139 and was even more prevalent in airship use. The diesel-engined airship R101, which crashed in 1930, was intended to fly to India but had only partially replaced its petrol starter engines with diesel ones.
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Turbine engines can run on diesel
The use of diesel in aircraft engines has been explored since the late 1920s and 1930s, with the first successful flight of a diesel-powered aircraft occurring in 1928. Turbine engines can indeed run on diesel fuel, and this is not an uncommon practice for helicopters in Australia.
Diesel has several advantages over aviation gasoline (avgas). Firstly, it has excellent specific fuel consumption, which means it can provide longer ranges. Secondly, diesel has reduced flammability, making it a safer option, especially in hot climates. Finally, diesel fuel has a higher density, which can be advantageous depending on the aircraft's requirements.
However, there are also disadvantages to using diesel in aircraft engines. One significant issue is that diesel tends to freeze or form wax crystals at low temperatures, which can block filters and stall engines. This is a considerable concern for aircraft operating at high altitudes and in cold climates. Additionally, diesel may not be compatible with certain engine components, such as fuel lines, orings, seals, and fuel pumps, which are designed for jet fuel or avgas.
In recent years, there has been a resurgence in aircraft diesel engine production due to the increasing cost of avgas and concerns about its future availability. Aircraft diesel engines also offer environmental and health benefits due to the absence of the toxic and polluting tetraethyllead antiknock ingredient found in avgas.
While turbine engines can technically run on diesel, it is essential to consider the specific engine design, operating conditions, and local fuel specifications. Jet fuel, which is a highly refined form of kerosene, remains the standard choice for turbine engines in the aviation industry due to its reliability, safety, and performance.
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Jet fuel is refined kerosene
Jet fuel is a clear to straw-coloured refined kerosene-based fuel. It is also known as aviation turbine fuel (ATF) or avtur. Jet fuel is a mixture of a variety of hydrocarbons, with a carbon number distribution between 8 and 16 (carbon atoms per molecule). The exact composition of jet fuel varies depending on the petroleum source, so it is defined as a performance specification rather than a chemical compound.
The two main types of jet fuel are Jet A and Jet A1, which are produced to a standardized international specification. Jet A1 is the most common type of jet fuel in the United States and can be used to power all jet aircraft. Jet A and Jet A1 can be used interchangeably, but there are some differences in their manufacturing specifications. For example, Jet A1 has a lower freezing point (-47°C) than Jet A (-40°C), making it suitable for long-haul international flights over polar routes. Jet A1 also contains static dissipater additives, which reduce static charges that can form during fuel movement.
Another type of jet fuel is Jet B, which is a naphtha-kerosene blend. Jet B has an even lower freezing point of -60°C, making it suitable for extremely cold countries such as Alaska and Canada. However, it is extremely flammable and dangerous to handle. Jet B is not as commonly used as Jet A and Jet A1, but it is often used in Russia and for enhanced cold-weather performance.
Jet fuel is similar to diesel fuel and can be used in compression ignition engines or turbine engines. Turbine engines can run on diesel fuel, and it is not uncommon for helicopters to refuel with diesel in some parts of the world. However, diesel fuel is not suitable for all aircraft engines, and it may cause damage. Jet fuel contains more sulfur than diesel fuel, which improves lubricity and eliminates the need for a lubricity additive.
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Frequently asked questions
Yes, diesel aircraft engines can run on diesel fuel. However, it is not common for planes to use diesel fuel.
Diesel engines are usually heavier than other types of engines, and the more power they produce, the heavier they need to be. This is a significant disadvantage for aircraft.
Aviation fuels are either petroleum-based or blends of petroleum and synthetic fuels. They include avgas (aviation gasoline), Jet A, Jet A-1, and TS-1, among others.
Yes, piston-engined aircraft use leaded gasoline. However, it is not recommended to use any fuel other than what is specified by the manufacturer.
Hydrogen, natural gas, and electric planes are all possibilities for the future of aviation fuel.
