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Interceptor 400 answers

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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" pitch range.

Before we move on, let's take a moment to tell you what this mysterious Pitch range is, and what it does.

With 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.

The diagram 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.

For most 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.

Equally, 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 sky.

The best combination of these are therefore from around -3 degrees (negative pitch) up to maybe 7-8 degrees positive pitch.

The other 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 earlier.

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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