glow plug motor modulator

This an old video from my former channel, Radioam232. How to supply a glow plug engine with the necessary current to make the glow plug function. Normally this is 1,2 Volt at approx. 400-800 mA. I built a lot of air plane models when I was young. This 0,8 cc Cox engine (US made) was my first hobby airplane engine in 1967 (it still works in 2012, after 45 years).