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I want to invert the engine in my new warbird. What
do I need to know?
By Steve Lucy There
are a few things to know about the nature of setting up and running any
engine inverted. RC engines are small, lightweight and fairly
simplistic engines. They do not have all the complex equipment
available to competition aerobatic full size aircraft engines or
similar machines; therefore, when asked to run in inverted mounting,
sometimes they can be a bit more challenging to set up than an upright
installation. First, realize that your
engine may be full of fuel PRIOR to starting, risking hydrolock which
can do severe damage to your engine, especially if the aircraft has
been stood on its nose or even just nose low during transportation.
Always flip the prop over to check the compression prior to using a
starter. If it seems harder than normal, remove the glowplug and flip
through several times or spin the engine with an electric starter to
clear it and avoid the possibility of hydrolock.
Next, ALWAYS follow your manufacturer's instructions on
engine break in. In almost every case, the engine should be broken in
on a test stand where it can be properly watched, cared for, fueled,
drained, and adjusted easily and safely. If your manufacturer
recommends in flight break in, just be aware that it will be soft on
power until the break in period is completed and always be prepared for
a dead stick landing during those break in flights.
Then, once it is broken in, it can be installed. In some cases
tuning in the inverted installation is a little more challenging due to
the tank/carb relationship combined with the inverted mounting. If this
is the case, tuning with the aircraft inverted/engine upright will help
get the engine running flawlessly, then it can be run inverted.
Finally, some engines, especially inexpensive
bushinged budget engines, will not like to start in an inverted
position, again due to carb/tank positioning and fuel flow. In those
case, you may need to start the aircraft inverted and turn upright to
fly when running. Happy
Flying!! "If it doesn't have camouflage and guns, I don't like
it!"
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