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Hey John i wrote thid because thats a rule in the AMA rules that you can't use that stuff.

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IMO, things like this should be considered with beginners every so often.
In the technology of today, those items and why those items exist are usually long forgotten.

Back in the period around 1960, tetranitromethane was used as a fuel additive for CL speed models.
They came with their big Ice-Coolers, with an ounce of *tetra* packed down in lots of ice. Just before a flight, two drops tetra per 3 ounces (Hazy recall on exact mix) of high nitro glow fuel was prepared and injected into the model's bladder fuel tank.
The engine had to be ported for high speed and then ran rather quietly, and hauled its rear! There was no benefit from just any engine.
After the flight, the engine (usually mounted on an aluminum belly pan) was detached from the model and inserted into a large container of wood alcohol. Tetra was not friendly to the brass components of the engine.

So yes, IMO, the history of this sport has evolved around more than 3D and a backyard electric ARF.

Lasted several years. but then put to rest.