The only fuel that I am confident I will be able to find for
aircraft in the coming decades is Jet fuel. If I purchased a
certified aircraft for long term use, it would be powered by this,
or be an experimental (where I could use whatever I want)

In California, the abolishment of MTBE made all the autogas
STCs of aircraft invalid (the new ethanol gas isn't covered by
the STC).

I don't have confidence that 100LL will be available in the near future.
80 has already almost disappeared from general aviation.

Diesel? I'd be surprised to see that in 200 California airports
within the next 10 years.

In article ,
Stefan wrote:
Bill Daniels wrote:

They feel their engine would make a near
perfect tug engine.

Surprize! :-)

A rumor is ...

So much for "practical information".

Diesels make power at lower RPM's than a spark ignition engine so they can
use larger, quieter, more efficient propellers.

There isn't a requirement anywhere that propellers have to be direct
driven. Actually, the only diesel flying today uses a gearbox.

(Sorry for my unfair quoting, but I couldn't resist.)

Stefan



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Mark J. Boyd