Finally found 3 good tips on making my mCPx perfectly stable in flight.
Vibration:
The blades need to be perfectly balanced - both weight wise and COG. I do precision shooting so have in my man cave a RCBS digital scale accurate to .01gram. .03grams or more is enough to make high speed vibrations. confirmed sensitivity by placing a slither (2grains) of tape on one blade (set was previously perfectly balanced) - instant high speed vibration. Remove tap, high speed vibration gone. For low speed vibration - grossly out of balance.
I found 2 sets of high performace blades balanced out of the packet, but the 'beginner' blades (have weights protuding) were .04 to .06 grams out = high speed vibration.
Wobbles:
As per the sticky thread, this was solved on my machine by cleaning the servo potentiometers (I sprayed contact cleaner). The 'chatter' also markedly reduces (but not 100%).
Wobbles gone after clean.
Intermittent shakes:
After MANY crashed I noticed that the small hole in the main shaft had elongated, creating a .2mm vertical slop/play in the main shaft. I couldn't get a main shaft, so used a .2mm shim - intermittent shakes gone.
Result - my thoroughly abused mCPx is now hovering a low/high speed with total stability.
Summary:
For those that have shakes/vibes/wobbles, check for multiple problems, all could exist. Eliminate 1 at a time. These machines really can fly once tuned.
Vibration:
The blades need to be perfectly balanced - both weight wise and COG. I do precision shooting so have in my man cave a RCBS digital scale accurate to .01gram. .03grams or more is enough to make high speed vibrations. confirmed sensitivity by placing a slither (2grains) of tape on one blade (set was previously perfectly balanced) - instant high speed vibration. Remove tap, high speed vibration gone. For low speed vibration - grossly out of balance.
I found 2 sets of high performace blades balanced out of the packet, but the 'beginner' blades (have weights protuding) were .04 to .06 grams out = high speed vibration.
Wobbles:
As per the sticky thread, this was solved on my machine by cleaning the servo potentiometers (I sprayed contact cleaner). The 'chatter' also markedly reduces (but not 100%).
Wobbles gone after clean.
Intermittent shakes:
After MANY crashed I noticed that the small hole in the main shaft had elongated, creating a .2mm vertical slop/play in the main shaft. I couldn't get a main shaft, so used a .2mm shim - intermittent shakes gone.
Result - my thoroughly abused mCPx is now hovering a low/high speed with total stability.
Summary:
For those that have shakes/vibes/wobbles, check for multiple problems, all could exist. Eliminate 1 at a time. These machines really can fly once tuned.