RC Electric Motor cutting out

by Dennis

I just bought a Super Cub with all stock parts. After charging the battery for an hour or so, until the light stopped flashing, I put the plane together and tested it. It ran all the way to full throttle and everything, including the controls, worked fine. I ran the battery down until it was almost dead.

Then, after charging the battery as I did the first time, I took the plane out to actually fly it and after hitting 50% throttle, the engine cut out.

All the other controls worked fine. I think it's important to note that the plane runs at full speed without the propeller on the shaft; it is only when the propeller is attached that it cuts out.

Any ideas or advice?

Thanks for your time

Comments for
RC Electric Motor cutting out

Click here to add your own comments

more info
by: Dennis

Here is the list of parts I'm using with my plane.
They are all stock, everything that came with the plane.

Motor Size: 480 Power
Radio: 3 channel proportional FM
Prop Size: 10 x 8
Speed Control: Power FET proportional ESC/receiver
Battery: 8.4V 1000mAh Ni-MH
Charger: AC Delta Peak Charger: 8.4V-9.6V
HobbyZone HBZ7130

Thanks for your help

Battery is not fully charged?
by: Michael from Oz

G'day Sounds to me like the battery is not fully charged. When there is a load on it (ie the prop) it cannot supply enough current, the battery voltage drops and the safety switch in the ESC switches the motor off. With no prop, there is very little load so the battery can turn the motor.

Do you have a voltmeter? If you measure the voltage with the engine running it should not drop much below the non running voltage.

You do not say what kind of battery it is or what sort of charger. Most batteries don't like to be charged when they are hot. And most LiPos need long slow charging preferable with a charger that charges each cell independently.

Can you tell us a bit more.

Also, you should never completely discharge a battery. Do a Google search and you will find the correct lowest voltages for the various sorts of batteries. Nicad and NiMh are about 1.1 volts per cell.