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12-24-2010 12:50 AM  9 years ago
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Steveact1

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CSI - AP Crash Investigation Unit
A year ago last fall we had a little mishap...it was highlighted in this thread:

https://rc.runryder.com/t543467p1/?...panasonic+crash

I have the on-board video rendered and will post it shortly. Let's see how good you guys are at watching...listening...and determining what happened.
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12-24-2010 01:40 AM  9 years ago
tabbytabb

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seattle

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Steve,

a little mishap is when a flybar gets bent, or tail blades get dinged on the ground....I think of the rotorhead shearing off as something a bit more major!

Cant wait to see the video
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12-24-2010 01:40 AM  9 years ago
Steveact1

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Here is the video. It plays in normal speed, then 50% speed, then 25% speed. Can you hear the main rotor slow down as the engine revs up?

Watch at YouTube

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12-24-2010 01:43 AM  9 years ago
Steveact1

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Tabb-

Ha! Very true. Man...that was a very quiet ride back home that day! Took me a long time to get the nerve up to post the video!
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12-24-2010 01:53 AM  9 years ago
Wayne Mann

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Hi Steve,

This one is easy. You sheered a drive pin on a gear that drives the mail rotor or some similar type failure. It didn't strip a gear or break a gear or you would have heard a loud snapping sound. The rotor head simply slowed down and when it got too slow the blades folded back, then she boom struck and then fell like Willey Coyotee to the ground. I remember Wendell saying that he was like one hundred yards away when this happened so he would not have heard anything really, especially considering how loud a turbine is. It would have just appeared to explode in mid air. Lucky you were not hovering over top of the Combine and fell on it or fell just in front of the machine and had it eat the helicopter.

Didn't you guys send the remains back to Bergen for examination? What was their conclusion?

Merry Christmas to all

Wayne Mann
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12-24-2010 02:15 AM  9 years ago
tabbytabb

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seattle

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Looks like you were flying a JR radio to me???

I kid I kid...

Steve, I know exactly how that car ride went. I had a similar one in Croatia after my 5D decided to take a swim in the ocean I just consider mishaps an upgrade opportunity now!
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12-24-2010 02:26 AM  9 years ago
Steveact1

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Hi Wayne

Yes we sent parts back. I also seem to recall some discussion about vibration harmonics as a possible issue. But it was in so man pieces it was difficult to tell. One of the main blades hit one of the fuel tanks on the way down and sent it flying like it had been hit by a nine iron. It took us some time before we finally found it way far away from the chopper. Thank goodness it was bright red or we might never have found it.

That camera is the one I'm using on Robbie...it's amazing it survived with minor damage.

Hope you all have a great Christmas!

Steve
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12-24-2010 02:28 AM  9 years ago
Steveact1

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USA

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Upgrade opportunity...that does have a certain "ring" to it doesn't it!
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12-24-2010 02:34 AM  9 years ago
Wayne Mann

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Vibration most likely didn't cause this. This was a simple drive train failure. Onboard video is a great tool for figuring out stuff like this. Without that audio it would be anybodys guess as to what happened.

Wayne
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12-24-2010 05:26 AM  9 years ago
BungeeMike

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Honolulu, Hawaii

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Look on the bright side, at least you didnt have to swim for it.
Aloha
Bungee
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12-24-2010 04:43 PM  9 years ago
Yeehaanow

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Vermont

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Ouch!
This makes me think about monitoring the audio from the downlink so your cam op or pilot would hear when an engine goes out and can call dead stick... but even then, it happened so fast, was there even a possibility of an auto?
Was it even possible to auto that heavy bird under any circumstance?
-Tim
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12-24-2010 04:55 PM  9 years ago
Steveact1

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No chance to auto. It disintegrated in the air. Everything happened so fast, we all just stood there and looked at each other. Of course I didn't see it myself because I was wearing the downlink goggles, but I saw what you see in the video.
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12-24-2010 05:08 PM  9 years ago
Wayne Mann

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If someone was monitoring the audio and heard the head speed decaying, buy the time they informed the pilot it would be too late. The pilot needs to have that audio signal being feed to his head set. If the pilot heard the head decaying he would be able to act fast enough to get out of the pitch and thus stop the thing from exploding in air. But, from that altitude along with the fact that the model was sitting in a dead still hover you would not be able to auto it, but you would be able to slow down the decent a little before hitting the ground minimizing the damage. A turbine powered or gasser powered machine is making so much noise though. You would have to really be listening hard to catch it fast enough. An electric powered machine is so quiet depending on the machine that rotor blade noise is about all you hear, but even then when you loose drive to the rotor blades the head slows down extremely fast.

Wayne Mann
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12-24-2010 05:48 PM  9 years ago
jeffscholl

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Whitefish, MT

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The initial violent piro reminds me of a 90 I was spooling up that threw a tail blade. It was tail in and I remember a 105 whizzing by my head. Ah the memories ....

Edit:
I just noticed that it spun to the right. Were your blades turning counter-clockwise?

Cheers,
Jeff
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