Why the jet engine was once dismissed as an impractical, fuel-hungry flight of fancy

History · Published 3 October 2026 Swipe more like this →

In short: Early aviation experts doubted the jet engine could ever be economically viable. They believed it was too inefficient and underpowered compared to the reliable piston engine. Yet, as propellers hit the sound barrier and piston engines reached their mechanical limits, the jet engine quietly revolutionized global travel and military power.

In the early 20th century, the piston engine reigned supreme. By the 1930s, however, designers faced a wall: as propeller tips approached supersonic speeds, efficiency plummeted. Meanwhile, reciprocating engines grew so complex—requiring dozens of cylinders and intricate supercharging—that maintenance became a logistical nightmare. While skeptics like Edgar Buckingham in 1923 argued that jet propulsion held no practical value, pioneers like Whittle and von Ohain recognized that at high altitudes, jet engines offered superior power and efficiency.

The transition required more than just a new engine; it demanded a total rethink of aircraft design. To maintain economic viability, jet airliners needed to be larger to carry more passengers and stronger to withstand the stresses of pressurized fuselages at high altitudes. Engineers also introduced swept-back wings—a concept independently developed by Adolph Buseman in 1935 and Robert T. Jones at NACA—to reduce drag as planes approached the speed of sound. Ground infrastructure, from refueling to air traffic control, had to be overhauled to support the new, faster pace of jet travel.

Britain initially led the charge with the De Havilland D.H. 106 Comet, which first flew in 1949. However, a series of crashes caused by metal fatigue in the pressure cabin forced its withdrawal in 1954. Boeing seized the opportunity, leveraging its experience with the B-47 bomber to develop the 707, which entered service in 1958. Today, jet engines are marvels of longevity, with maintenance intervals stretching into tens of thousands of hours. Modern engines like the GE90-115 produce up to 115,000 pounds of thrust, a scale of power that was physically impossible for the piston engines of the past.

The social impact has been profound, shrinking the globe through rapid, long-distance transit. Yet, this progress comes with high stakes. Developing new aircraft now costs billions, and the industry relies on constant growth in passenger traffic to remain sustainable. While jet aviation is more cost-effective and reliable than ever, the sheer complexity and expense of modern design mean that the number of aircraft produced has diminished, marking a shift from the rapid, experimental era of the mid-20th century to a mature, high-stakes global industry.

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