How to measure and adjust pitch CP Pro

[3lpartners]

I have a CP pro and have replaced several parts on the main rotor assy. It seemed like Ilost a lot of collective in flight. I backed out the server arms providing more pitch. However, it doesn't have enough negative pitch. How can I measure and set the blade pitch and power curves to factory?

What tool do you use to setup pitch percentages?

Thanks,

Scott

[Gino CP]

You can buy a pitch gauge or just use your eyes. Setting main blade pitch to zero means having the blade edge centerline parallel with the flybar when you are looki at its edge.

Before making adjustments, disconnect all motors. Arm the heli. Switch idle up on. All 3 servo arms must be horzontal or 90 degrees. Best effort here. Link must be on the center outermost hole.

Things to check are:

I. Swash Plate alignment

II. Main Blade pitch

III. Tracking

IV. 4-in-1 adjustments


I. Swash Plate Alignment

1. Set Tx (transmitter) trims to center, throttle trim minimum. Idle up switch off, throttle minimum.

2. Disconnect main and tail motor connecter from the 4-in-1.
Align the main blades.

3. Intialize but turning on Tx and plugging in battery.

4. Note all of servo arms must be 90 degrees from vertical. +3 deg ok.

5. Swash plate must be level relative to the main gear.

6. Rotor head must be centered on the hub (part it slides up and down on).

7. Remove and adjust servo links to correct alignment.


II. Main Blade Pitch and Tracking

1. Disconnect main and tail motors and initialize heli.

2. Hang heli by the paddle control frame and point one blade towards you.

3. Set flybar level. Need not be accurate but best effort.

4. Put throttle to middle stick. Turn on idle up.

5. Centerline of blade tip must be zero degrees for each end.

6. Adjust the long pitch link connecting the swash plate to the mixer arm if needed.


III. Tracking Adjustment

1. Turn off Tx and heli. Connect main and tail motor connectors.
Align the main blades.

2. Weigh down heli on the ground with cds or books put over the skids.

3. Initialize heli. Put red tape on one blade.

4. Throttle up past halfway. About 3/4 stick.

5. View spinning blades from the side. They should appear as one. If they
split up, you must adjust tracking.

6. Increase pitch on low blade by half a turn on the pitch link.

7. Do so until you get perfect tracking. Sometimes this is not possible.
Anything less than 1 cm is good.


IV. 4-in-1 Adjustments

1. Intialize heli.

2. Throttle up until heli gets light on the skids.

3. If tail wags, reduce Gain (counter clockwise).

4. If tail moves to the right, increase Proportion. If to the left,
decrease Proportion. This is done with heli off.

5. To adjust Gain, get heli light on skids. If you have wide tail wags,
increase Gain. Increase until tail has short rapid wags. Then decrease until steady.

6. When hovering tail may drift. Readjust Proportion as needed.

[Pinecone]

Step 1) Buy a pitch guage.

Step 2) Go to the Finless Video section and download the CCPM 1 and 2 videos from teh Trex 450SE section.

Step 3) Watch videos and learn the secrets.

[Anubis328]

Pinecone is right... Go buy a pitch gauge. I'm using the one from Align, they don't cost all that much, and you really cannot eyeball the pitch.

[carlo_the_wonder_frog]

I suggest writing down all the adjustments you make as you make them, a good setup can sometimes take hours of adjusting links and you may get things wrong and have to go back. In the end its all worth it and future adjusments are easy once you know how.
Definitely Finless' CPPM videos are worth watching. Pitch guage is a must.

[=-C°G-=]

I think this would make a good 'sticky' for this forum. It provides clear, simple steps to get a good setup on a BladeCP. I know it definitely helped me when I first came across it. :thumbup:

[=-C°G-=]

Sticky this thread please?