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Strange Thing

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Old 06-19-2009, 04:38 PM
  #1
h1979pk
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Default Strange Thing

I have been flying Hobby Zone Firebird Phantom for the last 6 months. 2 days ago it acted very strangely. After 5 to 10 seconds of flying suddenly it took very sharp right turn with nose down and then it hit the ground. I thought it could be my mistake. I flew it again and it did same thing again. I then checked the controls. Everything was working fine on ground. I flew it again and it did same thing again. I thought it could be range problem. I then checked the range and it was ok. All this is very strange to me. Does any know what is the cause of problem? I will really appricate if anyone can help.
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Old 06-19-2009, 07:15 PM
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Default RE: Strange Thing

Are your Transmitter batteries fresh?
If they are fading, they might allow for good control up close, but when you fly out and increase distance/range, they can't deliver enough to maintain control.
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Old 06-20-2009, 05:44 AM
  #3
h1979pk
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Default RE: Strange Thing

yes, transmitter batteries are fresh.
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Old 06-20-2009, 06:16 AM
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Default RE: Strange Thing

How about a renge test. If that checks out ok, there is mention about adjusting flap position and stick trim lever in the troubleshooting section of the manual.
Is the rx antenna ok?
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Old 06-20-2009, 08:08 AM
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h1979pk
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Default RE: Strange Thing

Antina is ok i think because i tested range and it was perfect.
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Old 06-20-2009, 08:53 AM
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Default RE: Strange Thing

Did you check the Rx batts? Are you using a 2.4 gig system. Your symtoms match low voltage dip conditon and the subsequent response . The Rx does not alwyas reset it upon seeing low voltage. The voltage dip may not be low enough to cause a reset. But it can cause the symptomes you describe without going in to fail safe. But then maybe it did and came out when the voltage came back up.

Is your batt ok? How do you know? How many digital servos are you using?

Interested in you response.

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Old 06-20-2009, 09:03 AM
  #7
h1979pk
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Default RE: Strange Thing



I have tried to different batteries. 2 servos

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Old 06-20-2009, 09:06 AM
  #8
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Default RE: Strange Thing

Page 22 of manual are adjustments for unwanted turning. Did you try those?
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Old 06-20-2009, 09:09 AM
  #9
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Default RE: Strange Thing

Did you do forming charge on the NiMH batts ? Suggest 3 full cycles ( Loaded discarge and slow charge(c/10)).

Just a thought.

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Old 06-20-2009, 09:10 AM
  #10
h1979pk
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Default RE: Strange Thing

yes i have tried those as well. But i dont think its relevant to that, coz plane flies ok (straight)for 5 to 10 seconds and then suddenly it takes sharp right turn with nose down.
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Old 06-20-2009, 09:13 AM
  #11
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that day i did the same. discharged the batteries and recharged them slowly. with both batteries same thing happened.

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Old 06-20-2009, 11:42 AM
  #12
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Default RE: Strange Thing

Wing moving in flight...Have the rubberbands stretched? Maybe try new and add a few more?

How was the wind on that day? Stonger ? Coming from the left?

Did you try a flight yet with the "ACT" turned off?
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Old 06-20-2009, 01:14 PM
  #13
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Default RE: Strange Thing

That was very calm day. No wind. ACT on and off, checked with both. Same thing happened.
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Old 06-20-2009, 02:12 PM
  #14
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Default RE: Strange Thing

Maybe a call to the factory might help?
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