120-CCPM Setup
Spektrum DX8
last updated 10-24-2010

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Safety
This page is a setup of the Gaui Hurricane 425/550. With any electric helicopter it is a good safety precaution to use a seperate receiver pack during your setup instead of the main flight pack. You should keep the radio in HOLD but if you had the main flight pack connected and you reversed your throttle channel or released throttle hold then the rotor head / blades could start spinning. If you are using a BEC built into the ESC then unplug this from the throttle channel of the receiver and connect your 4-cell pack there. If you are using a seperate BEC then whatever socket you have that plugged into the receiver, remove it and inseart the 4-cell pack.
If you do not have a 4-cell pack then disconnect two of the three motor wires.

Step 1: Setup radio for CCPM Enter the system menu by pressing the roller while you turn the radio on. Scroll down to Swash Type. Set it to '3 SERVO - 120'.
Step 2: Connect the servos In the 'Swash Type' function of the radio you can see the servo layout.
Step 3: activate throttle hold
Enter the system menu by pressing the roller while you turn the radio on. Scroll down to F Mode. Go to Hold and set it to Hold. This will set the Hold function to use the switch labeled Hold. If you would like a different switch, this is where you would set it.
Step 4: Set Throttle Hold Curve

This is from the main menu, if you are in the system menu, press the Back button a few times.
From the main menu, press in on the roller then scroll down to 'Throttle Curve'.
Scroll to the 'H' and press the roller. This will highlight all points at the same time. Press the roller and set these to 0%.
Step 5: set the pitch curve
In the main menu select Pitch Curve. Scroll to 'H' and set the points to 0,50,50,50,100. The reason you set the middle three points to 50 is so you do not have to wonder if you have the collective stick exactly in the center during the setup. Notice that the collective stick is at position 63 yet the output to the servo(s) is still 50%.
Step 6: set end points servo setup
In the main menu go to Servo Setup. Set the top selection to 'Travel'. Set the middle selection to Aileron. Set the bottom two points to 100%. Once you highlight the values they will be grouped together unless you move the stick. Just press in on the roller to adjust then press the Clear button to reset them to 100% each. Do the same for the other two servos, Elevator and Pitch.
Step 7: zero the sub-trim
While still in the Servo Setup function, change the top selection to Sub Trim. Set the Aileron, Elevator, and Pitch to 0.
Step 8: center the trims main screen shows trims not centered
On the startup screen you can see the position of the trims. These are the bars along the left, right, and bottom of the display. Click on the picture above and you will see the left trim indicators are solid black. This means they are not centered. Note that you can have this radio setup for 'common' trims or seperate trims for each flight mode. If you have the Trim Step function set for 'F-Mode' then make sure the trims are centered in every mode.
Step 9 Servo direction sub-trim
Go to the Servo Setup function. Change the top selection to 'Reverse'.
Safety: Make sure the Hold switch is in the on position (pulled toward you).
Servos: Note that normally at this stage you would not have the servo arms on as shown in the two pictures above. However you could be doing a setup after changing radios in which case you know the servos mechanically correct already.

New setup, no servo arms:
Power up the helicopter and move the collective stick up while you watch the rotation of the servos.
In the two pictures above you see the rotation each servo needs to go. The Aileron needs to rotate Clockwise. The Elevator and Pitch need to rotate counter-clockwise.

Update setup, servos already mechanically setup:
Power up the helicopter and move the collective stick up while you watch the swashplate.
The only thing that matters is that all three corners of the swashplate move together. The swash can go up as you move the collective stick up or it can go down. The direction you will need it to go for flying will be set later. Right now you just need all three servos to work together.
So as you move the collective stick up and watch all three points of the swashplate:
Did all three move up? Then you are done, go to the next step.
Did all three move down? Then you are done, go to the next step.
Did two go one way and the third went the other direction? Which servo is connected to that point of the swashplate? Select that servo in the radio and reverse it. Now you will see all three points of the swashplate move the same direction.
Since you are redoing a setup you can skip the next couple of steps about installing the servo arm.

Step 10: Install link balls

This part gets complicate because of being a push-pull. Note that if you bought the upgrade metal levers then they do not have the offset geometry so the balls will install in the factory drilled holes of the servo arm.
1. Set length - Adjust both links so that the center of ball holes exactly match the length from the servo horn screw to the screw in the center of the lever.
2. Ball distance - Measure the distance from the center of one ball to the other ball.
3. Mark arms - In the sample picture this was 27mm. On the servo arm you would make marks 13.5mm from center.
4. Position links - In the fourth picture you can see the links have been positioned over the lines that were drawn and the servo arm has been rotated so both links are an equal distance from the edge of the servo arm.
5. Drill - With the links positioned correctly, mark the center of the hole in the links and then drill holes. Use a drill bit that is smaller then the 2mm screws that you will use. The screws should have a tight fit.
6. Install the balls and repeat the process for the other two servos.
Step 11: Install servo arms
Next we need to install the arms in the correct position on the servo spline. To do this we need to first place the collective stick in the middel. In step 5 we set a flat line in the middle of the throttle hold pitch curve to ensure the radio is sending out a center position even if the stick is not perfectly in the center. Make sure the throttle hold switch is still activated. The start screen on the radio will have 'Hold' on it. Start with the elevator servo, it is the easiest. The arm should be placed on the spline so it is exactly straight up/down. Due to the match of the spline teeth and the teeth in the servo arm you may not be able to find a position to exactly be straight up/down. If so, then get as close as you can then go to the Servo Setup function and adjust the sub-trim of the elevator servo so the arm is exactyl straight up/down. The next two servos are a little more difficult but not all that hard. First notice the ridge in the frame under the levers. You can see this in the picture on the right. You need to snap the links on the balls of the servo arm and install the arm on the servo so that the edge of the lever is parallel with the ridge in the frame. Due to the teeth of the servo spline, if you cannot get perfectly parallel then go to the Servo Setup function and adjust the sub-trim to get the lever parallel to the ridge. Do the same for the servo on the other side.
PS: Don't forget to install the screws that hold the servo arms to the servos.
Step 12: set blades to zero degrees The two long links from the swashplate to the head are used to set the blade pitch. Use a pitch guage set to zero and adjust the links so you have zero pitch with the collective stick in the center. If you do not have a pitch guage then hold the helicopter on the side with both blades pointed down. When the blades are inline with each other then you have zero pitch.

Step 13: reset pitch curve
At this point you still have the Hold pitch curve set with 0,50,50,50,100. Change this back to factory default: 0,25,50,75,100
Step 14: Swashplate direction

Go to the Swashplate function. Move the collective stick up. Did the swashplate move up?  If NOT then sel 'Pit.' and change it from a positive value to a negative. For example if it was +60 then change it to -60.
Move the aileron stick right. Did the right side of the swashplate tilt down?  If NOT then select  'Ail.' and change it from positive to negative.
Move the elevator stick forward (toward the top of the radio). Did the front side of the swashplate tilt down?  If NOT then select  'Ele.' and change it from positive to negative.
Step 15: adjust range In the [SWASH MIX] menu you will see a value for the 'Ail', 'Ele', and 'Pit'. This value represents not only the direction of travel (positive or negative), but also how much that function is to move. This replaces the End Point (EPA, ATV's) that most are use to using to limit the travel of each servo.

Collective Pitch - For the collective pitch move the stick on radio all the way up. Make sure that the mixing base does not hit the bottom of the head block. If so then lower the PIT value. Measure the pitch of the blade at this full up position then check the pitch again at full down. The pitch range you want will depend on the type of flying you do. Most people will setup a range of 20 degrees (-10 to +10). However for the latest 3D flying a common range is 26 degrees (-13 to +13). With the collective still up, adjust the Pit. value in the radio to get 10 degree on the blades. And with the stick down you should get -10. If you find the top and bottom angles are not opposite of each other then it means you did not do Step 12 (zero blade setup) correct.
Note: If you do not have a pitch guage then look at step 12. With the blades folded together so they overlap each other, measure the distance between the blade tips. I would measure from the chordwise center. Say you get 192mm. Now measure the distance between the center of the head to the same spot you just measured. In this example say we measured 545mm. Take 192 and divide by 2. This gives 96. Now 96 divided by 545 and you get 0.1761467... Now take 180/pi and multiply that by your previous answer 0.1761467. That will indicate you have 10 degrees. Another way to calculate this is to use the degrees you want, in this case 10, and do a tangent of it. tan(10)=0.176326... then multiply that by the length from the blade bolts to the blade tip, 545 in this example. That gives an answer of 96. Multiply that by 2 and you get 192mm from blade to blade.

Aileron - With the main blades rotated so they are inline with the tailboom, set the pitch gauge to zero degrees and move the collective stick so the pitch gauge aligns with the flybar. Now hold full right aileron and realign the pitch gauge level with the flybar. This will give you the amount of right aileron cyclic pitch. A common value most want to obtain for the cyclic pitch is 8 degrees. Adjust the Ail value in the radio to get this.

Elevator - Do the same as you did with the aileron except have the main blades 90 degrees to the tail boom. And use the elevator stick to get the elevator cyclic range. Adjust with the Ele value.

Next... The CCPM part is now done and you just need to setup the pitch range you want to run in each flight mode.

Here you just put the pitch gauge on and adjust the pitch curves in the radio to get the angles you want. Here are a few typical configurations:

-10 to +10 setup

Point
L

Point
25%

Point
50%

Point
75%

Point
H

Normal (-4,+4,+9) 30 inh 70 inh 95
ST1 (-10,0,+10) 0 inh 50 inh 100
ST2 (-10,0,+10) 0 inh 50 inh 100
Hold (-10,0,+10) 0 inh 50 inh 100

 

-13 to +13 setup

Point
L

Point
25%

Point
50%

Point
75%

Point
H

Normal (-4,+4,+9) 34.5 inh 65.5 inh 84.5
ST1 (-10,0,+10) 11.5 inh 50 inh 88.5
ST2 (-13,0,+13) 0 inh 50 inh 100
Hold (-10,0,+10) 11.5 inh 50 inh 88.5