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HK-450 Flights #11-12: Maintenance mishaps (crash #3)

Posted 04-24-2009 at 07:42 PM by nasukaren
Updated 04-25-2009 at 03:32 PM by nasukaren

Flew the HK-450 in the evening. There were some maintenance mishaps that I had that led to 2 crashes one after the other. I'll count them as one crash.

I had replaced the tail rotor shaft with a 48mm long one from CNCHeli in order to try to get more travel and because the old one seemed considerably out of true. I hadn't quite properly set it up for the test flight and the tail wasn't holding without some effort.

On a spool-up, the bird leaned over and the blades hit the ground. This caused an aileron servo to strip.

On the last flight of battery #11, the tail gave way and the bird went into the side of my garage. The wood blades snapped. Feathering shaft seems ok. Main shaft seems ok. Flybar shaft was bent back into shape.

After that, I fixed everything up and it seems like it was flying OK for all of battery #12.

HK-450 Crash #3 Damage
1x Main Blades
1x OEM Main Gear
1x HXT900 servo gears stripped

HK-450 Running Damage Tally:
1x Main Blades
2x HXT900 servo gears stripped

1x Feathering shaft
1x Main shaft
1x HXT900 servo gears stripped

1x Main Gear

From RC Flight Log:

[IMG]file:///Users/karen/Library/Caches/TemporaryItems/moz-screenshot.png[/IMG][IMG]file:///Users/karen/Library/Caches/TemporaryItems/moz-screenshot-1.png[/IMG][IMG]file:///Users/karen/Library/Caches/TemporaryItems/moz-screenshot-2.png[/IMG]#7 24 April 2009 at 6:39 PM 9:38 AM 3S Zippy 2200 mAh 20C (1),
#6 24 April 2009 at 6:19 PM 4:00 AM 3S Zippy 2200 mAh 30C (2)
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  1. Old Comment
    So, would you recommend one of these? Obviously none of your head parts have been destroyed or damaged, and I think thats pretty good. I've been thinking about buying one of these.
    Posted 04-25-2009 at 09:42 AM by iflymyhelishigh iflymyhelishigh is offline
  2. Old Comment
    nasukaren's Avatar
    iflymyhelishigh -

    Well, I'm using a Sonix/HDX head and tail so it's not stock. But it does seem pretty tough and you really can't lose at $35. Just buy 3 of them!

    Although I might have bought an EXI for $55 instead, since it already comes with a CNC head....

    Posted 04-25-2009 at 03:33 PM by nasukaren nasukaren is offline
  3. Old Comment
    nasukaren's Avatar
    I'm begnning to think that my crash here was caused by the aileron glitch that recently led to another crash (#4). I'm replacing my PPM receiver with a S-PCM one, which should reduce the glitching.
    Posted 04-30-2009 at 01:21 AM by nasukaren nasukaren is offline

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