As3x Flybarless 250 - crash

2nd crash of my fbl 250 which is running an mcpx 3n1 board as its stability augmentation system. 'Postmortem' inspection revealed that a ball link on the swash was missing.

Here's the Root Cause Analysis:

This was not a mechanical failure, the swash ball link broke upon impact.
Whenever the tail servo moves (by rudder or by gyro), the 3 cyclic servos would jump. On the bench test, it may seem like very tiny jitters seen on the cyclic servos but these jitters can cause the heli to crash like in the video above (it's like a bad radio glitch).

And here's the Solution / Prevention:

For the benefit of those who trying to do this flybarless conversion, ie, installing the MCPX board on your 3d heli or Scale Heli, I strongly recommend powering the MCPX board and the 3 cyclic servos from a separate BEC. This would completely eliminate the common 'ground' in which the gyro/ tail servo could have an undesired interference on the mcpx board / the 3 cyclic servos in such a circuit (although this may not be happening to your conversion right now).

Now, on my 250, only the AR6100 receiver, gyro and tail servo are drawing power from the ESC's 5V. All other electronics are powered separately by a Turnigy BEC. The battery's supply is spliced to power the ESC and the Turnigy BEC.

Category:

Sports

Tags:

• flybarless
• 250
• mcpx
• as3x

[terence79chan]

yep, it's depressing. I replaced the swash and found out where the problem was, I have post an update in the description above to benefit those who are trying this flybarless conversion.

[highadvantage]

Man, that stinks. Sorry dude. I know how it feels.