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Interceptor 400 answers

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A4 - Interceptor 400 - Why is the Interceptor not CCPM ?

Very good question, and one that could end up with a very long answer, but not in this section of my heli help system ......

In the very early days of RC helicopters, the radios that we had were fairly crude to say the least, and very few offered the ability to do the clever mixing functionality needed to control a CCPM based swash plate.

The NON CCPM helicopters were therefore pretty well the 'standard', so that the more simple radios  could still be used to control the helicopter, which is of course far more complicated than controlling RC aeroplanes.

CCPM (Computer Controlled Pitch Mixing) relies on the radios to mix the output of all three of the swash plate servos to provide the correct movement for not only pitch increases/decreases, but also to mix in Aileron and Elevator variations as well.  This means that if you were to loose any one servo on a CCPM helicopter, you would lose all control totally, as each servo has to do it's own bit to keeping th eswash plate at the correct angle/position

The NON CCPM system however does not rely on this mixing, so each servo  only has a single task to perform, Pitch control (Collective), Elevator and Aileron.  So if you lost say the pitch control on a NON CCPM helicopter, the swash plate would stop rising and falling when told to by the throttle/collective stick, but you could still land it safely by lowering the speed of the main rotor blades as you still have full control of the Elevator and Aileron controls (Cyclic).

A quick way to identify what type of control your helicopter uses is to look at the swash plate.  There are always 3 servos connected to 3 balls on the outer ring of the swash plate.  If those swash plate balls are separated by only 90 degrees (a right angle) then  it is NON CCPM.  If the angle that separates them is 120 (or possibly 140) degrees, then it is a FULL CCPM system.

At the left is a standard Interceptor 400 swash plate. 
You can see that the outer ball connectors are at 90 degrees quite easily.
 

         

Another nice feature of NON CCPM machines is that they are usually easier to repair and setup.



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