"Viperdoc" wrote
I suspect that pumping the oxygen into the system somehow started the
fi it probably is a new definition for the term "hot start"

In that engine, the compressed air is injected into the top of the
cylinders by an air distributor at about the same time as the spark
is fired. (it also has a "shower of sparks" system)
This sometimes results in the engine firing (and starting) before it
seems like it even turns.

In the YAK-52, the compressed air also operates the retractable gear,
the flaps and the brakes.

Bob Moore