It was a glow engine, I believe he could control power to the glow plug.
Maynard Hill was well known for his attention to detail even so it it is
impressive to both get a glow engine to run at about 30,000 feet (6
inches
of murcury) and get power out of it.

Walter Banks

> >Maynard Hill developed a wing leveler for some of his altitude
> >record setting model planes (about 30,000 ft) in the mid to
>
> What kind of engines did he use ?!
>
> Peter

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