Is an electric jet engine possible?

is an electric jet engine possible: 300 vs 800 Wh/kg gap

Understanding is an electric jet engine possible helps travelers and engineers anticipate future aerospace trends. Significant weight challenges from battery limitations hinder progress, posing risks for long-distance flight efficiency. Learning about emerging propulsion technology ensures a better grasp of new ways of moving air, revealing the path toward electric aviation.

Is an Electric Jet Engine Possible?

Yes, is an electric jet engine possible is a reality currently existing in various stages of development, from lab-scale electric plasma jet engine prototype systems to industrial-strength hybrid-electric designs. While we do not yet have battery-powered Boeing 747s, the fundamental physics of using electricity to generate high-velocity thrust is already being proven by aerospace giants and nimble startups alike. However, the path to replacing traditional combustion depends heavily on how we define a jet engine - whether as a simple fan or a sophisticated plasma thruster.

In my experience tracking aerospace trends, the skepticism usually centers on the battery. I remember sitting through a conference in 2022 where an engineer joked that a battery-powered long-haul jet would be all battery and no passengers. He was half-right. The energy density of jet fuel is roughly 12,000 Wh/kg, whereas current high-end lithium-ion batteries struggle to exceed 250-300 Wh/kg. That is a massive 40 to 50 times difference in energy-per-weight, highlighting the aviation battery energy density challenges the industry must overcome. But wait for it - the breakthrough is not coming from better batteries alone, but from entirely new ways of moving air.

How Electric Jet Propulsion Actually Works

Traditional jet engines work by sucking in air, compressing it, mixing it with fuel, and igniting it. The resulting explosion shoots out the back, creating thrust. An electric jet engine removes the fuel and the fire. Instead, it uses electricity to power a motor that spins a fan at incredibly high speeds or, in more futuristic designs, uses electricity to create a jet of superheated plasma. There are three main paths scientists are currently exploring to make this a daily reality.

1. Electric Ducted Fans (EDF)

This is the most mature technology. An EDF is essentially a high-performance electric motor housed inside a duct that drives a multi-blade fan. By shrouding the fan, you reduce tip losses and significantly increase efficiency compared to an open propeller. Modern EDFs can achieve thrust-to-weight ratios that were unthinkable a decade ago, with some 2.6-megawatt motors now reaching power densities of 13 kW/kg. In simple terms, these are the engines you see on most current electric vertical takeoff and landing (eVTOL) aircraft.

2. Plasma-Based Jet Engines

This sounds like science fiction, but it is real. Instead of burning fuel, these engines use electricity to ionize air into plasma. Microwaves or high-voltage discharges superheat the air, causing it to expand and shoot out of a nozzle at supersonic speeds. Research has shown that these prototypes can generate pressures of up to 24,000 Newtons per square meter. That is roughly equivalent to a commercial jet engine. However, they require immense amounts of electricity - so much that we do not yet have a way to carry the power source on a plane.

3. Hybrid-Electric Systems

Think of this as the Prius of the skies. A smaller gas turbine runs at a constant, efficient speed to act as a generator. This electricity then powers multiple electric fans distributed across the wings. This approach can reduce fuel consumption by 5-10% on regional routes by optimizing aerodynamics. It is the bridge between the fossil fuel past and the hybrid electric jet engine technology of the future. It allows us to keep the energy density of fuel while gaining the precision and efficiency of electric motors.

The Weight Problem: Batteries vs. Jet Fuel

The biggest hurdle isnt the engine - its the gas tank. Jet fuel is incredibly efficient because as you burn it, the plane gets lighter. Batteries, unfortunately, weigh the same at the end of the flight as they did at takeoff. This creates a vicious cycle of weight. To carry more batteries, you need a bigger wing, which adds more weight, which requires even more batteries. It is a mathematical trap that currently limits pure electric flight to about 200-500 kilometers.

Ill be honest, when I first looked at the math for a trans-Atlantic electric flight, it seemed impossible. If you tried to power a mid-sized jet for 6,000 kilometers today, the battery would weigh more than the entire plane. It takes me back to my first drone build - I kept adding bigger batteries for more flight time, only to find the drone couldnt even lift itself off the ground. The breakthrough came when I realized that more power is useless without less weight.

Current data suggests that for electric aviation to become viable for short-haul commercial flights (up to 1,000 km), battery density needs to reach about 500-800 Wh/kg. We are currently seeing an annual improvement rate of about 3-5% in battery technology. At this pace, we are still roughly 10-15 years away from seeing regional electric jets carrying 50+ passengers. Until then, hybrid systems will likely dominate the market.

Jet Engine Technology Comparison

Traditional Turbofan

- Complex, thousands of moving parts requiring frequent overhauls

- Kerosene-based jet fuel (12,000 Wh/kg)

- 15,000+ km (Ultra long-haul capable)

- High CO2 and NOx emissions at altitude

Electric Ducted Fan (EDF)

- Simple, few moving parts, lower operating costs

- Lithium-ion batteries or Fuel Cells (250-500 Wh/kg)

- 200-500 km (Short-haul/Regional)

- Zero operational emissions if powered by renewables

Plasma Jet Engine (Experimental)

- High complexity due to extreme heat and microwave components

- High-voltage electricity (Microwaves/Electricity)

- Currently theoretical; limited by power supply

- Potentially zero emission; produces ozone as byproduct

The Duxion eJet: A Lesson in Friction

Duxion, an aerospace startup, set out to create a 2-megawatt electric motor that could replace gas turbines on regional jets. The initial challenge was heat - high-power electric motors generate massive amounts of thermal energy that can melt internal components.

Their first attempt used standard air cooling, but it was insufficient. During ground tests, the motor reached critical temperatures within minutes, forcing an emergency shutdown. The team felt defeated, realizing their compact design was its own worst enemy.

The breakthrough came when they moved to a 'rim-driven' design, where the motor is built into the outer edge of the fan duct rather than the center. This increased the surface area for cooling and allowed for integrated liquid thermal management.

The result was a scalable eJet motor capable of producing thrust equivalent to traditional engines with 95% efficiency. They proved that while 'going electric' is hard, rethinking the physical shape of the engine is the key to success.