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A4 - Interceptor
400 - What
pitch range should I have in 'Normal' mode
This is a
topic that is much discussed by helicopter pilots, and to a large
extent we all have our own views on what is the "right"
Before we move
on, let's take a moment to tell you what this mysterious Pitch range
is, and what it does.
Collective pitch helicopters, the main rotor blades are able to have
their individual angle of attack to the airflow changed during
flight. When the angle of attach increases on both blades, the
result is to potentially create more lift.
above shows the result to LIFT from different angles of attack of
the main rotor blades.
In the case of
most RC helicopters, they will become light on their skids at around
+5 degrees of pitch. as the pitch increases beyond that, the
helicopter will start to lift off the ground. Equally, if the
pitch drops to a negative value, the pitch actually reverses, which
means that rather than getting lift, the helicopter will actually
PULL ITSELF DOWN towards the ground.
learners, you DO NOT WANT TOO MUCH negative pitch, but you do need a
bit just in case the helicopter gets caught by a gust of wind
and lifted up unexpectedly. The negative pitch then allows you to
force the helicopter down against the wind gust.
learners do now want too much positive pitch, as a learner does not
want to be able to make the helicopter climb rapidly up into the
combination of these are therefore from around -3 degrees (negative
pitch) up to maybe 7-8 degrees positive pitch.
thing that it is important to set up correctly is what pitch you
have at around half throttle. The best number for this is
around 4 degrees. This is because It is normal for the radios
to be setup to expect to the helicopter to start tasking off just
over half throttle, which is about 5-6 degrees as we have mentioned
A final point
to note is that these pitch angles are the ones used to actually fly
the helicopter with, and NOT the right ones if you are doing the
mechanical setup, which I have covered elsewhere.
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