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Interceptor 400 answers

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A4 - Interceptor 400 - What are the various lever arms on the head called ?

This is something that seems to confuse most new pilots, and even some more of the more experienced pilots as well.

Starting from the bottom of the main shaft where it sticks out from the top of the frame, the first thing you see is the SWASH PLATE. This is a crucial part of every helicopter, as it is the mechanism that allows us to transmit control commands all the way up the rotor blades, despite it rotating quickly.  The swash plate has 2 parts to it, the outer swash and the inner swash.  You can see that the outer swash is connected to the servos by connecting rods of one form or another, and therefore it cannot possible rotate. To ensure that it cannot do so, there is a locating rod that sticks out of the back of the outer swash plate that engages in a slot in a bracket immediately behind the mainshaft called (unsurprisingly) the Anti Rotation bracket

On the right is a picture of an INT400 swash plate and the locating peg going back to the right in the picture into the AR bracket.

This picture shows very clearly the connecting rods going to the servos are connected to the swash plate at the connectors on the outer swash plate ring

 

The inner part of the swash plate does of course, rotate at the same speed as the main blades, and that is why, as you can see in these pictures, all the connections going upwards toward the top of the head start from the INNER ring of the swash plate.  On the picture above, only the two RADIUS ARMS are actually in the picture connected to the inner swash plate. Note that these arms are "bent" and that the bent part always faces toward the direction of rotation of the head.

As we move upwards form the Swash plate, we find what are called the washout arms. These are linked to the INNER swash plate by the Radius arms mentioned above, while the other end of each washout lever arm goes up to the head itself
This is shown more clearly in the picture on the right, where the connecting rods going upwards can be seen connected to the flybar control cage

 

Here is a fuller picture of the top of the head. You can see that the large rectangular frame is the Flybar control cage.

Also visible here are the Mixer arms, which run alongside the flybar holder, through which the flybar can be seen coming out at each end.

A clearer picture of the mixer arms sitting INSIDE the Flybar control cage, with one end connected to the main blade grips by a short connecting rod.

It is very important to note that if you ever remove the flybar holder and mixing arms to repair the helicopter, the mixing arms MUST be replaced  the correct way around.

That is with the short end of each arm (measured from the pivot screw) being "behind" the rotation of the main head (which is clockwise), so that the short connector arms shown here are ALWAYS connected to that shorter end.

 

So basically, the order upwards is Swash Plate, then washout arms, then mixer arms and flybar control cage, finally comes the Blade grips themselves.

 

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