Thanks much for the replies.

Good to hear it should work on the 15%. It's still fresh, picked it up locally.

I'll give it a cleaning with alcohol and another go.

How much voltage/amperage should I use to drive the glow-plug? I'd just clipped on my model rocket launcher (9v battery source) since it was near my workbench and had aligator clips.

I've got 3 Dymond pico servos that I picked up for my L-19, and even though my Airtronics receiver isn't the smallest in the world, it's not all that heavy.

So... It would be good to replace a 300 size electric in a glider, what about other designs? I ran across a Sopwith Camel .020 in another thread, is that only practical by using a more efficient .020 engine or uber-lightweight components? One of the planes I eventually want to model is the Curtis Jenny, because my grandfather flew one in WW-1. 1/2 A seems particularly appealing to me, due to limited work and storage space in my home.

Also - what about throttle? This engine has no throttle, is it common for folks using this sort of engine to fly without a throttle? Also, would it be a practical idea to put a brass sleeve over the cylinder with an exhaust/air intake port in it, so that it could be rotated around the cylinder, choking off the exhaust and fresh air intake to act as a throttle?

Thanks again,
Bill