>   * for really fast stopping of the engine you could cause the
> piston/cylinder to try to act on something less compressible - such as
> water by using a car windshield washer fluid pump with a small reservoir
> and hose directed into the intake... though this might be too drastic.

Actually you can soak the engine by opening the choke in some cases with
the carburator air at 50% or so. The engine will suck so much fuel it will
go out or at least slow down to idle puff-puff. This needs to be tried
for each engine condition.

Much better is to vent a small canister of nitrogen or halon into the
air intake. This will almost certainly stop the engine immediately.

Doing what you suggest (allowing the engine to suck liquid) is very
dangerous. In an aircraft it will almost certainly loosen the propeller
nut and throw it and the propeller off at high speed, or break the
propeller if it is large enough. The shock will probably remove the engine
from its mount. In a car it may break every gear tooth in the transmission
and it may bend the crank or jam the piston. If the engine is big enough
it may actually explode by throwing the cylinder head in addition to all
the above.

Peter

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