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Bad Crash... what failed?

Posted 10-11-2010 at 12:53 AM by nwmtech
Updated 10-11-2010 at 01:54 AM by nwmtech

Well, the 600 came out of the sky today all by itself. On the 3rd flight I noticed the throttle did a couple weird glitches after I came down and was walking out to check temp at the end of the flight. I didn't think too much of it at the time because I was quite rich on the low end and it was idling like crap anyway (although in hindsight I guess I kinda new it was some sort of electronic glitch by the way it sounded). Fired it up for the 4th flight and no glitches so I didn't think much of it and continued the flight. About 1/2 way through the flight I decided to double check my stop gains so I did some stationary flips. About 2 seconds after stopping and in a nice and stable hover it gave a pretty violent, but quick and short, left aileron glitch. No change in rpm from the motor and as quickly as it happened it quit. Weird part is it automatically went back to where it was hovering stable so that indicates it wasn't a glitch from the tx as it would have continued in the heading of the bogus aileron input. Immediately I covered throttle hold and started to bring it back slowly. Wasn't even 2 seconds later it did it again except this time it kept doing an on/off glitch. I was holding full right aileron to try and upright it when I hit TH. It was no use and the heli rolled over on it's left side and went in from about 40 feet knife edge.

Damage is pretty decent although thank God I had time to hit TH. Heck, I even had time to cut the throttle before it went in. In hindsight even if I would have hit TH after the first glitch I wouldn't have made it down before it did it again. I immediately ran out with my Gview2 and voltage checker for diagnosis before I shut it off. All satellites lit up solid. Full function of all servos under heavy load with no stripped gears. Gview2 showed 1 miss on 1 satellite (I'm running 3) which is completely normal for an average flight so no loss of comm there. No FC changes had been done since the last flight but just in case I double checked all settings. Input PPM jived with TX monitor screen. Battery voltage was great at 3.9v per cell. All connectors were tight and no visible chaffing of any wiring. Since it all happened in a stable hover I ruled out an over-gain situation especially since it flew great all day until then. I was expecting a failed aileron servo but then the whole "throttle glitch" thing popped back into my head and really has me wondering. When I got home I ran about 1300mah of battery power through the servos (on an external receiver) working the snot about of them the whole time with no issues whatsoever.

The TotalG will be going out Express Mail to CJYE tomorrow for diagnosis. Honestly, I'm not sure what I want the outcome to be. The biggest thing is I need closure as to what the cause of this was. If the TotalG comes back as bad then I'm going to be really bummed and disappointed due to the amount of time I've got into it. If not... then I'm going to be really stumped as to what the failure was and lose a lot of confidence in the heli.

I had intended on buying a either a 90 airframe or an N5 airframe in a week to start for a winter build but the cost of this crash just put a huge dent in that idea as if I was to put the heli back to the exact same condition it would be about $350. I spend a lot of time making sure my helis are setup and built with the utmost of quality and crashes like this just really bend me the wrong way.

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  1. Old Comment
    I figured I might as well add that in the end I was able to pinpoint the failure to a bad aileron servo. It had nothing to do with the totalG.
    Posted 10-28-2010 at 03:19 AM by nwmtech nwmtech is offline

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