"Stefan" wrote in message
...
Bill Daniels wrote:

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

Surprize! :-)

Selling an engine for an inappropriate use is a good way to get a bad
reputation. Engine manufacturers who plan to stay in business are very
careful about this. I have good feelings about Doug Doer and his group of
engineers.

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.

The DeltaHawk is flying with good results. Geared propellers are a good idea
but they seem to work best with a large number of cylinders and in large
aircraft where the weight penalty isn't so great.


Bill Daniels