Louis,

Our diesel are not true diesel engines, but compression ignition two strokes. The ether is essential for the combustion process to begin.

Our usual fuel mixture is 30% Ether, 25% Castor Oil and 45% Kero.

This fuel mix is for sport use models and is often varied for specific applications. eg racing can be 30/12/58, also using some exotics like TEL and replacing Castor oil with synthetics.

Vintage engines might increase the oil content to protect frail old engines.

You might get better results from a glow engine running on ethanol mix. By choking the carb size right down you may get good consumption results although you'd give up a little power.

Good Luck

Greg