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Search Continues to Really Get the Lead Out

Future aviation fuel candidates have yet to meet EAGLE mandate.

Aircraft being fueled
Aircraft being fueled [Credit: Shutterstock]
Gemini Sparkle

Key Takeaways:

  • Tetraethyl lead (TEL) was historically crucial for high-performance piston aircraft engines, enabling significant advancements in aviation from Lindbergh's 1933 flight to WWII aircraft by preventing detonation and boosting power.
  • The EPA's 2023 "endangerment finding" has mandated the elimination of lead from aviation gasoline (100LL), with the EAGLE task force targeting a universally available unleaded replacement by the end of 2030.
  • Developing a suitable unleaded 100-octane avgas replacement is complex, requiring high detonation resistance for diverse engines and compatibility with existing aircraft fuel systems, potentially necessitating some performance or technical adjustments.
  • Three companies (GAMI, Swift Fuels, and LyondellBasell Industries) are currently vying to provide the replacement fuel, each pursuing different regulatory approval pathways and facing unique challenges in widespread adoption.
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When Charles Lindbergh and his wife, Anne Morrow Lindbergh, embarked on their ambitious 1933 flight to survey over-water routes for airlines, they packed a secret weapon. The famous couple headed to some of the most isolated areas of the North and South Atlantic because that’s where the most direct routes from North America to Europe and South America lay.

Technology had come a long way since Lindbergh’s most famous flight from New York to Paris just six years earlier, and the heart of their new Lockheed Model 8 Sirius (named Tingmissartoq by a young Inuit boy in Greenland) was a brand-new Wright Cyclone SR-1820 radial engine, a state-of-the-art powerhouse that made 710 hp and set the standard for reliable performance at a time when powerplant technology was rapidly developing. 

Russ Niles

Russ Niles is editor in chief of AVweb. He has been a pilot since 1991 and joined AVweb 22 in 2001. He and his wife Marni live in southern British Columbia.

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