geoffs crash and learn

MAIN BLADE PITCH SETTING UP

 

To set up the blade pitch correctly you have to have the helicopter powered up so DISCONNECT the leads to the main drive motor and tail motor (if fitted).

 

Turn on the transmitter and connect up the helicopters battery.

Ensure the PIT and PLT knobs are both set to centre position.

Set the throttle stick to centre position.

Then switch the idle up (mode 1 or whatever) ON.

 

Now working on the helicopter you need to loosen off the grub screw that holds the collective push rod to the servo pitch control arm bearing (located directly below the push rod).

By hand move the collective collar on the main shaft to its lowest position and take a measurement from a set point on the rotor head.

Now move the collar to its upper most position and take another measurement.

 

(For example let say measurement 1 = 45mm measurement 2 = 35 mm gives 10mm total collective travel)

 

we now want to set the collar at the mid position (example will be a measurement of 40mm) move the collar to the required position and tighten the grub screw in the pitch control bearing.

 

We now have the pitch control set up correctly and can now set the blade pitch up.

 Using a pitch gauge set the blades to ‘0’ degrees pitch adjusting the links to the blade holders to obtain the ‘0’ degrees, once both blades are set move the throttle stick up and down a couple of times then back to centre and recheck the pitch it should be ‘0’ degrees.

Now move the throttle stick to the top position and measure the pitch (require +9 to +11) to achieve this you need to adjust the PLT control on the transmitter, once you have the pitch you require move the throttle stick to its lowest position and take a pitch reading you should have between -8 to -10 degrees pitch this has now set the travel of the servo and your blade pitch up.

If your transmitter has a PLT lock then lock it now otherwise make a note of its position in case it gets accidentally moved you can reset it again.

Now switch back from idle up to normal flight mode on the transmitter and check the pitch at the lowest throttle position it should be ‘0’ degrees if it is out of range use the PIT knob to achieve ‘0’ degrees now lock this into the transmitter if possible or make a note of its position.

Move the throttle stick to mid position and then top position and your pitch readings should be around

Mid = +5 to +6

Top = +9 to +11

Your pitch control and pitch settings are now set up for both normal and 3D flight.

 

If you experience trouble in control flying in windy conditions in normal flight you can reduce the PIT knob down slightly to give you a negative pitch at O% throttle aiding decent this also effects the mid position pitch as well but not full pitch.

 

Hope you find this helpful

geoff