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Author Topic: Mini Titan AH-1W flight 15... failure.  (Read 4284 times)

Granpaw Jonah

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Mini Titan AH-1W flight 15... failure.
« on: May 25, 2014, 11:23:57 AM »

  Flight 15, 4 minutes into flight whilst in a stationary hover at 8ft, the left servo failed leaving the helicopter to drop like a stone onto the ground. The servo has clearly stripped its gears during normal flight, the servo motor is whistling round at 60000 mph! I can't see what other damage there is. Surprisingly little on initial examination. .Main drive cog teeth stripped......I will replace all the servos for metal geared I think.... better go and open her up then. Off we go for another edition of 'Sunday Autopsy'
  G.J.
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Granpaw Jonah

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Re: Mini Titan AH-1W flight 15... failure.
« Reply #1 on: June 09, 2014, 12:18:40 AM »

....... 1 x new servo, cost 16.00!! Finances (or lack of them) dictated I forget about upgrading all the servos to metal geared. In any rate I have to say that my initial diagnosis that the servo failed is wrong. What I think happened was that
a) the motor shaft did not have a 'flat' ground into it so the pinion grub screw was not gripping properly &
b) the drive pinion on the motor shaft had not been threadlocked. The combination of these factors allowed the pinion to gradually work its way off the motor shaft losing all drive. The servos teeth wwere stripped in the resulting crash.
  I've flown her 5 times since the repair and she flies as well as ever thank goodness.
 So I guess the lesson is that even though you have to unscrew all the factory fitted fuselage removing side mounted rockets etc, remove the drive pinion from the motor shaft and check it has a flat on the motor shaft and that the pinion is threadlocked.. it will be worth it to avoid what happened to me... It feels like a really underhand piece of 'Planned obselescence' by Thunder Tiger , or am I just paranoid?
  G.J.
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Coyote

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Re: Mini Titan AH-1W flight 15... failure.
« Reply #2 on: June 09, 2014, 08:39:21 PM »

I think your being a little paranoid, I think it could have just been a simple mistake when it was being constructed initially and not an intentional action. If they did that then there would be a flurry or bad press about it which would do their reputation no good which no company strive for 
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Granpaw Jonah

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Re: Mini Titan AH-1W flight 15... failure.
« Reply #3 on: June 10, 2014, 05:09:11 PM »

    Hi, I'm sure T.T. will appreciate the support. Did I say the motor shaft has splines and the pinion is for a round shaft?
 G.J.
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