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Trex 450 sport v2 gyro problem. . .

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  • Trex 450 sport v2 gyro problem. . .

    Okay, so I've done a few searches and read a lot of posts which go somewhere to explain some of the problems that I've had, but I thought I'd pop my forum cherry and ask for a bit of advice. . .

    I took my 450 sport v2 out for it's second ever outing this afternoon in gentle wind. . . I had a little bit of trimming to do (which I found to be quite some task while the little heli was being buffeted around) but things were going okay. . .

    Once trimmed, I started to experiment with my basic hover (although I've spent the last eight months plugging away in Phoenix and buzzing my little brushless McpX , I'm pretty new to flying in the real world!) and noticed that there was a little bit of very slow tail drift. A few gentle rudder inputs led to the expected corrections, so I decided to try a bit of side on hover and a few pirouettes. I've got to say that I was not overly impressed with the 'feeling' of the turns with respect to my rudder inputs. I also noticed a small amount of what I assume to be tail-wag. Now, I know that this is a known issue with the GP780 but thought that with a little bit of tweaking of the gyro settings I could surely solve this. . . Hmmm. . . Began to get a bit of an improvement, but to be honest it was still not feeling great.

    Well, I probably should have stopped there, but couldn't help myself but try a bit of simple forward flight with the heli in idle-up mode (I'm confident performing forward flight squares, circles, stall turns etc on the sim and with the McpX)

    This is where my troubles began. It would seem that on random occasions the heli would suddenly decide to change its orientation as if a sudden sharp rudder input had been made (which it hadn't). I would say that if it weren't for my experience on the sim and McpX I would have been in some real trouble and would not have managed to regain control. From that moment, the heli would then not respond to my rudder inputs, or rather would intermittently react, then 'stick' in that direction, unresponsive. Obviously, I did what I could to get into a controlled level hover and nurse the heli back to a nice landing.

    The Gyro setting on my dx6i was set to 63%. I wondered if it may be something to do with the headspeed change, so tried upping the settings to 73% and braved another flight. I had exactly the same problem, and was not enjoying the trouser-filling moments of recovery so landed again and put the McpX up instead for some joy before heading home. Oh, and what joy it was to fly something with SHARP rudder response, rock solid even in the gusty conditions! I even managed a couple of half piro flips, loops and some nice solid pirouetting hovers before running out of juice! So nice to finish on a high. . .

    So do I look straight away at the most common solution and get myself a Spartan Quark and be done with it, or is there someone out there with some advice that might solve this problem? It seems rather odd to me that the gyro can give such problems straight out of the box, with a brand new heli, but as I read more and more, I become less and less surprised, merely disappointed with what I've been sold. . .

    Hope someone can help. . . I really want to get some solid flying time in before the summer (haha!) is over!

    Thanks,
    Matt
    Raptor G4 - Radix 690s, OS 91HZ, Spartan Vortex v3, MKS HV servos, OptiFuel 20%
    Logo 600sx - Edge 603s, Turnigy 120HV - Scorpion 4035-500 - Mini Vbar - Savox servos
    Logo 550sx - Edge 553s, Turnigy 100LV - Scorpion 4025-1100 - Mini Vbar - Futaba 451/251s
    Blade 130X moneypit shelved

  • #2
    Apparently the 780 is a bugger to get right although once set up would appear to be a good gyro.

    Personally I like to have a gyro that just gets plonked on without having to spend ages tweaking settings. Most folks I know who have had a 780 have sold them on and either gone back to a 750 or to a Quark.

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    • #3
      I've had the same issue during flight and found that the tail servo was dropping out (I put it on a mates servo tester with a wipe cycle) intermittently. The potentiometer tracks wear out or get dirty. Cleaning the servo out with motor cleaner restored performance on the tester for a couple of minutes and then exactly the same thing happened. With a new tail servo the flight issues dissapeared. I've since bought myself a servo tester!
      Ian Revill

      Align Trex 700n DFC OS105HZ-R BD 3SX
      Align Trex 700e v1 HC-3SX
      Align Trex 550e v1 HC-3SX
      CopterX 450 SE V2 FBL BD 3SX
      Turnigy FBL100
      Hughes 500D with HK450 mechanics

      If it's not fun, why do it?

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