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Old 03-12-2011, 12:24 PM   #1 (permalink)
Gadflyii
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Join Date: Jan 2010
Default mCPx: Known issues, fixes, information rollup

I am hoping that this can be a good roll up of all the known issues with the mCPx, and have it be a good source of information. I will update the thread daily for the next few weeks, and then as required. If you have one of these issues, or have a new issue to report please post it here.

There were several attempts to make a thread like this in the past, so I am going to ask for all of your help in keeping the thread clean, and free of arguments and off topic discussion.


Current known issues:

1.) Feathering shaft screw backs out or is loose from factory.

Symptoms:
- Lateral play in the blade grips
- Main blade and blade grip ejection if the screw backs all the way out in flight

Fix:

- Check the feathering shaft screw and secure with a small amount of thread locker

HH Response:

- This issue has been confirmed by HH and has released an addendum to the manual which can be found here: BLH3500_Bulletin.pdf

2.) Main Blade Grip Bearing Failure

Symptoms:

- Notchy or "loose" bearings after crashes or in some cases new out of the box.
- Main blade and blade grip ejection, however the screw remains in the feathering shaft on the helicopter and "pulls through" the bearings on the blade grip.

Fix:

- Inspect blade grip bearings before first flight, and after any form of blade strike or crash.
- Replace main blade grips (HERE on HH's website)
- Replace with Align Trex 250 bearings, Align PN # H25060 681x mixer arm bearings (confirmed to be a direct drop in to the stock blade grip by myself) Here on Helidirect

HH Response:

- None at this time

3.) Uncontrollable rolls to the right.

Note: Their has been some reports of same behavior but to the front or back or a combination of the two.

Symptoms:

- The helicopter will yaw or pitch violently and unexpectedly without warning, and become unresponsive to any TX inputs.

Fix:

- *Unconfirmed* Rebind the helicopter with the proceedure found in the manual. This is believed to be caused by an incorrect binding of the helicopter to the TX. When binding the helicopter you must complete the binding process with the trainer switch.

Per the mCPx manual for computer TX's:

1.) Connect the flight battery to the helicopter, wait for the LED to flash
2.) Power on the TX while holding the bind switch
3.) Release bind button after 2-3 seconds, the helicopter blue LED will light up solid
4.) move the trainer switch, the swash plate will move up and down to confirm the helicopter is in computer mode.
5.) Disconnect the flight battery and power the transmitter off.


- * Unconfirmed* It has been suggested that a replacement of the all in one board may be required: HERE on HH's website

HH Response:

- None at this time

4.) Loose main motor screws

Symptoms:

- The screws that attach the main motor to the frame are loose from the factory

Fix:

- Remove the screws one at a time and apply a small amount of thread lock to each of the motor mount screws.

HH Response: None at this time

5.) Free play on the main shaft

Symptoms:

- The main shaft will have 1-1.5mm of vertical play
- Causes erratic pitch changes during flight, helicopter will "Jump" up and then "dive" down

Fix:

* First ensure that the main gear is fully "pushed up" on the main shaft as far as it will go*

- Use a few small shims to remove the free play, either on top of the main gear, or under the main shaft collar (it is best to shim under the main shaft collar).

- Remove the main gear & main shaft; use an exacto knife to increase the length of the notch on the bottom of the main shaft to allow the main gear to be pushed up higher on the main shaft to remove the excess play

HH response: None at this time
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Last edited by Gadflyii; 03-14-2011 at 12:00 PM..
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