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130X Blade 130X Helicopters Information and Help


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Old 04-13-2019, 01:51 PM   #1 (permalink)
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Default Is it the gyro or is it something else?

Long story short, I installed an external ESC on a spare (good and tested) 3-in-1 I had lying around.

Put everything in a test mule, Spin motor, servos and motor all seem to work on my bench.

When I go to hover test, the helicopter spins uncontrollably clockwise like a blown C gear -BUT- if I give it opposite rudder, it spins *counterclockwise* uncontrollably.

So whatever it is, it's not the C gear.

I also noticed that, with the motor off and sitting on my workbench, I don't get the usual servo chirping when I move the copter.

So did I cook the gyro chip?
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Old 04-13-2019, 02:41 PM   #2 (permalink)
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Is the tail shaft moving left/right at all...might be a worn D gear

That would explain the uncontrolled piro's


FYI I've ended up with a brand new Red Bull 3n1 that I don't have a use for
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Old 04-13-2019, 04:12 PM   #3 (permalink)
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D gear and shaft not moving.

I will test with another board that I have to see if anything interesting happens.
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Old 04-13-2019, 11:20 PM   #4 (permalink)
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Are you using stock servo or rotary?
If rotary you may need to move to other side of boom so that arm moves in correct direction. Have had this once on one of mine.

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Old 04-14-2019, 01:03 PM   #5 (permalink)
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Rotary servo, in this case a v.1 DS35.
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Old 04-14-2019, 01:21 PM   #6 (permalink)
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Not only does it need to be on the correct side of the boom...

The orientation of the servo inside the mount needs to be correct...

So there are 4 distinct mounting options in play


If needed...I have a hammer that will resolve your DS35
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Old 04-14-2019, 04:04 PM   #7 (permalink)
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Simple and easy.....Double/triple check your C gear and the gear mesh.


I had a misadjusted C/D gear mesh that would cause a twitch every now and them but mostly act fine. When the mesh got too bad it did this exact same thing.

Also, I had bad tail bearings that would let the gears skip which destroyed the C gear "D hole" that would still act fine other than uncontrolled piros on spool up.

Yes, it would fly normally once off of the ground (Hover practice) but spool-up was......interesting.
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Old 04-14-2019, 05:13 PM   #8 (permalink)
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Does that explain the fact that I can get uncontrollable piros in either direction?

That is an honest question, BTW.
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Old 04-15-2019, 06:31 PM   #9 (permalink)
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That is exactly what mine was doing.


No center, just CW or CCW.

I think there is less strain on the tail rotor when hovering than there is on spool up, which would explain why I could fly (Barely) but takeoff was a nightmare.
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Old 04-16-2019, 10:09 AM   #10 (permalink)
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Interesting. I managed to rip a cyclical servo out of the test mule frame (and my usual repair methods aren't working) so I haven't been able to test anything on that, but in the meantime I brought the board and ESC to a friend who is a professor of electrical engineering/computer science.

After looking at the board under a soldering microscope, his theory that the problem was in the soldering of the ESC, that there was too much bare wire and it was causing a short across one of the resistors.

Resoldered under the microscope using hot air. I tested on a known good airframe and everything flies fine.

I'll report back again when I have the test mule frame working once more to see whether or not there is also a problem with the test mule tail.

Also, I made an interesting discovery while testing the new board/ESC combination. The known good 130X has a huge tail vibration - but only sometimes. Usually, when I go to zap the vibration, it disappears.

During testing, I discovered that I can turn this vibration on and off, depending on how much endplay the C gear has.
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Old 04-16-2019, 07:49 PM   #11 (permalink)
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I found by moving the tailboom in or out of the frame slightly, you can adjust the gear mesh.


Give it a try.
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Old 04-17-2019, 02:52 PM   #12 (permalink)
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That's what I did. Vibrations be gone. Go figure.
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