A2A Simulations BONANZA ACCU-SIM V35B, Manual

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www.a2asimulations.com ACCU-SIM V35B BONANZA ::: A2A SIMULATIONS
51
FOR SIMULATION USE ONLY
The air and fuel are compressed by the piston, then the ignition system
adds the spark to create a controlled explosion.
intake manifold. Just below those throttle valves and inside
your intake manifold, the air is in a near vacuum. This is
where your manifold pressure gauge’s sensor is, and when
you are idling, that sensor is reading that very low air pres-
sure in that near vacuum.
As you increase power, you will notice your manifold pres-
sure comes up. This is simply because you have used your
throttle to open those throttle plates more, and the engine
is able to get the air it wants. If you apply full power on a
normal engine, that pressure will ultimately reach about the
same pressure as the outside, which really just means the air
is now equalized as your engine’s intake system is running
wide open. So if you turned your engine off, your manifold
pressure would rise to the outside pressure. So on a standard
day at sea level, your manifold pressure with the engine off
will be 30”.
IGNITION
The ignition system provides timed sparks to trigger timed
explosions. For safety, aircraft are usually equipped with
two completely independent ignition systems. In the event
one fails, the other will continue to provide sparks and the
engine will continue to run. This means each cylinder will
have two spark plugs installed.
An added advantage to having two sparks instead of one is
more sparks means a little more power. The pilot can select
Ignition 1, Ignition 2, or BOTH by using the MAG switch.
You can test that each ignition is working on the ground by
selecting each one and watching your engine RPM. There will
be a slight drop when you go from BOTH to just one igni-
tion system. This is normal, provided the drop is within your
pilot’s manual limitation.
ENGINE TEMPERATURE
All sorts of things create heat in an engine, like friction, air
temp, etc., but nothing produces heat like COMBUSTION.
The hotter the metal, the weaker its strength.
Aircraft engines are made of aluminum alloy, due to its
strong but lightweight properties. Aluminum maintains
most of its strength up to about 150°C. As the temperature