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| New project, semi internal combustion atmospheric engine! |
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| vtsteam:
John, it's been awhile since I flew with IC glow engines -- all electric now. But as I remember it glow plugs were just a coil of very fine platinum wire the glowed when you put 1.5V through them, and once the engine started would continue to fire the engine without current. I don't actually know if it's caused by catalytic combustion, or just the tendency of a fine wire to keep glowing when heated. But I imagine most other metals would have oxidized quickly. Don't know if they needed pressure to work. Sorry. Anyway, they worked, and are still available to try. |
| John Hill:
Thanks vtsteam, I dont really like the idea of using a glow plug but it is something that came to mind when I realised that the engine might run with a constant ignition source. |
| Jasonb:
You would be better off looking towards a "hot bulb" than a glow plug. These are basically a heated element sometimes using a small blowlamp if using liquid fuel others take a feed from a engines gas supply wich would work if running the model on propane or butane. Unlike a model glow plug these will stay hot enough to ignite your fuel when exposed to it. These were used on a lot of early gas engines. Take a look at the models Finds builds, you can see the miniature lamp that heats the element. http://www.findsminimodelhotbulbengines.dk |
| John Hill:
Jasonb, yeabut, hot bulb, glow plugs, hot tube and such ignition systems operate when the mixture is compressed. In the proposed atmospheric engine the fuel air mix will not be under pressure. The old very low pressure gas engines used a pilot light behind a sliding valve, that is not exactly what I am contemplating but it will be a pilot light at least to the stage when I get the engine running. |
| Arbalist:
Glass fibre is good for a wick when you get to that point John. |
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