I was running one of my old Hope 19 glow engines recently after testing a few diesels, and I forgot to change fuels!! The Hope started and ran just fine, but it didn't take long for me to notice that it smelled like a diesel! I soon figured out what I'd done (pretty easy, 'coz I had the diesel fuel squeeze bulb in my hand and the fuel was the wrong color!), but the thing was running so well that I decided just to let it run the tank out. It did so with no fuss at all! Upon refilling with glow fuel, it started right up again and ran as if it had never seen any erher or kerosene in its life!

I found an article in an old "Aeromodeller" magazine (England) from the 1960's in which the writer had tried an Enya 19 on diesel fuel and found that it ran just fine. So these experiences are by no means unique. I suspect that there's far more life left in glow and spark ignition fuel research than there is for diesels. As Mr. Cox said, the pioneers tried everything and found that while diesels would run without ether, ether worked by far the best. That hasn't changed. As long as ether remains available, let's be happy and just use it in our diesels!