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That’s only a problem because of the extremely old engine designs which we still use because of the expensive certification process for existing aircraft and ne

That’s only a problem because of the extremely old engine designs which we still use because of the expensive certification process for existing aircraft and new engine designs. We can design much better engines in just about every metric… and we do, just not for relatively cheap and certified GA aircraft. We actually do have 100LL alternatives and have had them but the missing piece has largely been certification of those fuels or even just carrying mogas for planes that are able to burn it.

p_l 5y ago
That's why it's great to see numbers like "70% of GA fleet piston powerplants will be now certified to use unleaded fuel".
- sokoloff 5y ago
  Balanced by “airplanes with those powerplants purchase about 20% of the avgas fuel used in a year”.
  - p_l 5y ago
    True. But it's a considerable step forward, and some of those engines provide shorter pathways for certifying sibling models, probably.