Motor spinning when radio is inactive or off

[AlanD]

After taping my hatch shut and walking to the pond, I notice my prop turning two or three turns then stopping as if the motor was energized. I thought I may have bumped the throttle so I paid no attention to it.

About 2 minutes of great running I made the mistake of not easing up enough into a head wind and the boat flipped. Quite spectacularly I might add. The boat was 20' away from me so I left the transmitter on, placed it on the grass next to me while I sat and waited for the wind to blow it back to me. I kept seeing the prop spinning two, three turns then stop every 5 or 6 seconds. This continued for about 5 minutes until I could reach in and fetch it. I disconnected the batteries, waited a minute then powered them on again. Without doing anything, the prop was "hunting" again. I turned everything off and powered on just the boat, no transmitter, same thing.

Anybody seen this?

This is on a brand new leopard 4082 with Seaking 180, fully charged batteries.

I've seen this years ago on my nitro when a bolt on a metal motor mount was lose and the touching of metals close to the antenna would cause the rudder to jitter.

[Heaving Earth]

What radio?

[AlanD]

Spektrum DX2E, stock Blackjack 29 stuff.

[JimClark]

throttle trim?

[AlanD]

Throttle trim is neutral. Ran through rebinding receiver and transmitter, still the same.

When I power up with no transmitter, there's a beep every 1 second and the motor kicks. Is this normal? Seems potentially dangerous if the motor is being energized.

See this video https://skydrive.live.com/redir?resi...J2LMRZ4wqplpXQ

[Heaving Earth]

Read the seaking instructions. I'm not sure about spectrum but sometimes the throttle channel needs to be reversed and the trim all the way up

[AlanD]

New info: if I power up with the receiver unplugged, the motor kicks every 1 second still.

I looked at the manual and there's very little info on the throttle trim. http://www.spektrumrc.com/ProdInfo/F...%20_Manual.pdf

The odd part is that is didn't seem to this last weekend and I have not changed anything since.

[AlanD]

Heaving Earth, I think you're onto something here. I replaced my Dynamite ESC recently with the Seaking. The Dynamite ESC has the option to reverse throttle which is enabled by default. The seaking does not have the option so I just swapped 2 motor wires but left the switch on the TX in the normal.

When using the seaking, should I put the TH TRIM all the way to one side, the TH switch in reverse and flip the 2 motor wires around?


As it now, if iadjust theTH trim just slightly then when I power everything up with the TX on, after the ESC beeps 6 times, the motor starts spinning immediately. Again, seems pretty dangerous.

This anomaly does seem tied to the throttle trim.

How do other set theirs up?

[tlandauer]

I don't think it has anything to do with your radio system if it does the strange thing with your rx unplugged.
Usually incorrect setting means with tx on, either motor starts to run ( usually throttle trim position or throttle channel needs to be "reversed" like on a Futaba system). or, if the throttle channel is set correctly, motor wires needs to swapped for correct rotation.
When powering up with tx off or rx unplugged, there should be no action on the motor. There is just faint beeps from the ESC/motor.

[kendt]

Its sounds like the trim was not set right when the esc was initially armed. Was the trim turned to full when the esc was armed?. I would try re arming with the trim turned up full. If the motor turns after it has been re armed dial the trim back to see if it stops.

[AlanD]

I'm not sure what right is. Is that the correct way to do it; turn it all the way to the right, then initialize the transmitter?

How is everyone else doing it? Also, are you setting the throttle switch on the transmitter to reverse?

[kendt]

Yes turn it clockwise fully. Hold the trigger then plug it into the battery pack. When it stops beeping release the trigger. After it beeps again it should be set. If you notice it running or twiching turn the trim count clockwise slowly till it stops.

[Brushless55]

This sometimes happens to me with my GTB3 radio and the T180 escs

[paultbg]

It looks like a failsafe settings problem.
All my Fly Sky receiver have this problem by default.
If you can reset the failsafe function to a position where the motor is not spinning, you will be fine.
On my case I need to push and hold few sec the fail safe button.
Regards

[AlanD]

The program card for the 180 only has about 5 settings, none of which is throttle reverse option. I'll try doing the TH TRIM all the way to the right procedure and see where that goes and post back here..