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HobbyZone Sport Cub S problem

#1
Hi all!
I have been using my HobbyZone Sport Cub S for three weeks now, and it has developed a strange problem.
When the cub gets 30 feet or more from me, it starts to act funny. Every so often, the motor shuts off, and all the control surfaces go straight. This pushes the plane into a free-fall, and it takes a second to recover. It gets worse the farther it is away from me.
All the batteries are fully charged and everything is connected and powered up.
On the manual, it says you can fly it up to 300 feet away from you, so it's not a distance/signal thing.
It's also not a stall thing, because it does this even when it's level.
Does anyone else have this problem, and can anyone help me?
I'm interested in getting more into the hobby, but I can't if my only rc plane is broken.
Thanks,

JDRC
 

kacknor

Build another!
#2
That sounds like a classic brown-out, or loss of signal. Could be that the transmitter batteries going weak. Could be interference from outside sources like power lines. Could be a faulty radio. I've seen it happen when the servos pull more current than the ESC can provide, but it's unlikely in this case. Is it occurring everywhere you fly or is it always in the same location? The stock RTF transmitter is not the greatest radio out there, but should be more than enough close up.

Insure there are fresh batteries. With the help of a friend, do a range check. Power it all up and walk away till the radio no longer controls the plane. That will give you a baseline range. Try to hold the radio somewhat side ways too. The weakest part of the signal is right off the end of the antenna. So if you point it at the plane, it wont go as far. Be sure you don't fly near high voltage power lines.

Good luck!

JD
 
#3
That sounds like a classic brown-out, or loss of signal. Could be that the transmitter batteries going weak. Could be interference from outside sources like power lines. Could be a faulty radio. I've seen it happen when the servos pull more current than the ESC can provide, but it's unlikely in this case. Is it occurring everywhere you fly or is it always in the same location? The stock RTF transmitter is not the greatest radio out there, but should be more than enough close up.

Insure there are fresh batteries. With the help of a friend, do a range check. Power it all up and walk away till the radio no longer controls the plane. That will give you a baseline range. Try to hold the radio somewhat side ways too. The weakest part of the signal is right off the end of the antenna. So if you point it at the plane, it wont go as far. Be sure you don't fly near high voltage power lines.

Good luck!

JD
Oh.
The batteries are fully charged, but I didnt know about the antenna thing.
I will also try a range check.
Thank you for your help! :)

JDRC
 

Montiey

Master Tinkerer
#5
Can you look inside the plane and see if there is an antenna? You won't be able to check for proper continuity, but you could at least check to make sure that it's pointed straight, and not curved.