[chronofar]

> but regulation and liability has made it impractical to develop a modern engine.

Can you go into more detail about this? What regulation/liability specifically has stifled modern engine development? And is the answer deregulation? Or more carefully applied regulation of a different sort?

I think specifics are critically important for this kind of thing. General rhetoric is often “too much regulation” or “not enough regulation,” but what we usually want is “the correct regulation to align incentives,” which is often different for different cases.

[WalterBright]

I've seen discussions of the engine, about the regulatory barriers to designing new piston engines for Cessnas so the leaded gas can be dispensed with. Businesses don't want anything to do with changing anything at all about those airplanes.