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Ace Hobby . Esprit Model . Thunder Power RC

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e-Minicopter Joker > Crashed - PCM lockout ?
 
 
windyone
Senior Heliman
Location: York, England

For the second time in no more than 20 flights my Mini Joker has gone in.

I have had the heli for over a year now but since the first crash I have only flown it every noe and then as I have been very nervous. I replaced a servo and the reciever (JR649s) last time around, the reciever was replaced as I bought second hand and wanted to discount this.

Flying again last Sunday I was tail in to the right of me some 20 yards away, 20 foot up, and I did right aileron to move it sideways towards me. It locked up and simply continued to roll and drop to the ground. I do think that the power was off as once it hit the ground that was it - no finkey chicken - but the impact did dislodge and disconnect my battery so maybe thats why power was off rather than failsafe coming in.

Has anyone else experience problems with their mini joker?. What could cause it?. I have lost all confidence in her. I dont know what else to do apart from swap out all my electrics including ESC. Do you have to route the aerial a certain way? By the way I always carry out range checks which has always shown everything to be OK.

Any thoughts?

Mick
04-07-2008 09:24 AM
 
 
cwd10
Veteran
Location: PA, - U.S.A.

Sorry about your problems.

I don't think the chopper has anything to do with it unless you have not grounded your tail boom or have not used RF chokes. If those things are good, start looking at radio issues. Does this occur when flying in the same general area? If so, it sounds like you're getting some kind of interference. Try to bring a scanner radio or frequency counter to the field next time to check for other signals hitting the RX. They don't always have to be on the exact same frequency. Cell phones are known to cause this type of lockout. A range check will only account for performance while on the ground. Is the problem occuring at a certain altitude or range? Another thing to try is set up the heli as if you're going to fly it, but leave the main blades off. Then, set the throttle failsafe to about 20% throttle. That way if you get a lockout or loss of signal, you will know the RX is going into failsafe. If it just goes crazy and acts sporadic, your RX may be getting overloaded with interference. Just a few ideas to try.

Added: Also check your TX to make sure it's output is not intermittent. Some radios have had issues with the internal antenna connector/base solder joint cracking.
04-07-2008 12:45 PM
 
 
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Real Raptors . Mikado Modellhubschrauber . GrandRC

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e-Minicopter Joker > Crashed - PCM lockout ?
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