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C2 - GENERAL - How do I use a pitch gauge ?

The pitch gauge is probably the single most important tool used when setting up a helicopter to fly correctly.  It is quite a simple device that lets you slip it over a main rotor blade through a spring access in the middle of the pitch selection arm.

You should only slip it over the end of the blade, do not push it too far down the blade.

Let's assume that you have just completed the full mechanical setup of your helicopter, and are now going to check that the pitch range is zero at 50% pitch range.  Slide the pitch gauge over one blade end, and set the pitch pointer to 0 degrees.  Turn the blades so that the main blades are directly ACROSS the helicopter, and then make sure that you only check the level with the flybar also absolutely horizontal.

Now bring your eye down level with the blade, and look at the top of the pitch gauge. It has a flat top surface that "should" be exactly in line with the horizontal flybar. If not, you need to adjust the blade angle using the relevant adjusting rod to bring it to the required zero degrees of pitch.

The same process is used when setting up the "flying" pitch range, except you move the pointer to what number of positive or negative degrees of pitch you want for a certain Throttle/Pitch stick setting, and then adjust the pitch curve in your radio until the top of the pitch gauge is again level with the horizontal flybar with the stick at the position you are setting.

Most people only actually measure 3 points with a 5 point radio. these are 0% throttle, 50% throttle and 100% throttle. A typical set of these measurements would be -4, +4, +9. Then you just adjust the intermediate settings to fill the curve in, so -4, 0, +4, +7, +9 would be a reasonable hover training pitch range.


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