Horizon Hobby Sport Cub S Motor oscillating\pulsating

Hi - I have a Sport Cub S, just purchased. Actually received one from Horizon Hobby last week, but the elevator would not respond and the motor pulsated badly.

They agreed to take it back. But I couldn't wait so I purchased another one yesterday. After about 3-4 minutes in flight, the motor began pulsating and the unit of course lost altitude and landed.

Not big crash, flying only on thick grass.

I tried a fresh battery, (1S3.7v 150mA 25C)also new, but the pulsating continued so I left the field.

After I came home, I tried it again and the motor did not pulsate. You think this is simply the motor getting hot?

I'm kinda new to planes, been into helicopter for the past few years. Also have a HH Champ which flies fine with no problems.

I'm hoping I didn't get another "lemon" unit. This plane has great reviews so just wonder if I'm doing something wrong.

I fly in the beginner mode but when the pulsating occurred, I tried it in all flight modes with the same result.

Appreciate any thoughts you may have.

Thank you.

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Battery issue?
by: David V.

A "pulsating" motor is usually a sign of a nearly depleted battery. Are you confident it is fully charges? Can you measure its voltage? (Ideally above 4V before starting flight.)

Depleted battery
by: Anonymous

Flight time on that battery is around 4 minutes give or take.

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