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HIROBO Turbulence - SDX - Freya - Sceadu > Evo 50 crash
 
 
Ltorib
Heliman
Location: Cental Texas

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Evo 50


This weekend I crashed and I am still miffed at the reason why. For starters let me tell you what I have: I got an Evo 50 here on RR, nice deal, 9252 all around and a nice OS 50 SX.
I took some parts off the machine, and rechecked but all in all it was a good build form the previous owner, I installed my TJ Pro on it and because I am here in Germany a new receiver because of the Hz thing.

So I get to the flying field, all in all it was a bit windy but I did not think it would be a problem, after reversing my gyro, I had to track the blades (TT carbons)…. I got that done and all and all while hovering the machine all felt good, maybe needed a bit more RPM’s on the head but I had not gotten that far.
Hovering there I did a slow hovering pirouette and as I got back to a tale in position the helicopter (approximately 7 feet high) on it’s own dipped down on its tail and hit the ground…
As it slammed into the ground I lowered the collective and it just sat there idling…

Not sure what happened. It was a very slow aft cyclic move… and I am not sure if I gave it a full forward cyclic but I did try to stop the aft cyclic slide..

Needless to say I am a bit upset but I am puzzled for the reasons why…
At the filed I took a look at the damage, and I noticed that the collective was stuck I thought that I had stripped the servo but once I got the washout pins realigned everything moved just fine,,, the elevator servo worked without any problems..

As I am writing this I am wondering if I had my pitch curve set too low for throttle hold and the washout came out of the pins (as I was resetting the tracking on my blades I would perform hovering autos--- an man could she hang in the air)…. I probably would not have noticed while hovering until a wind gust moved the heli and when I tried to move the controls it would not have responded properly.



For now she’s back on the fix it table, I’ll take the electronic parts off and send them to get checked. I’ll try it again 

Any thoughts on the matter would be appreciated.
06-13-2006 Over year old.
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Leif
Elite Veteran
Location: Oxford, PA - USA

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Sorry to hear about the crash. Where in Heidelberg do you fly? I was just in Karlsruhe on business and found the local heli club there. Nice guys, even if the field was almost impossible to find.

I doubt the radius pins disengaged from the washout block. When properly installed, the radius block should be about 3mm from the head block. This allows for an easy -10 degrees of pitch without risking the pins disengaging, and they can only disengage with full negative if you install the radius block too high on the mainshaft.

I would suspect that the fore/aft cyclic (elevator) servo froze. You say it slid backward "slowly", which indicates the control was fixed in a slight back cyclic position. The fact that your correction didn't register would also support this theory. Is it possible that you had an intermittent servo connection? This could be caused by a bad servo plug or a bad servo wire or solder joint.

If you are running a PCM receiver, it is also possible that the heli was in "lockout" and the elevator position for the lockout was set to a slight back-cyclic offset. This could only be the case if you failed to program the failsafe to cut the throttle, since you don't mention a change in headspeed during the event.

Hope you get things sorted.

Leif
06-13-2006 Over year old.
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anuong
Senior Heliman
Location: Sibu , Sarawak , East Malaysia

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Hi !
Sorry to hear that too , mine also crash today cause by the dame servo jam , so good luck fo us here , hope you can recover it soon
06-14-2006 Over year old.
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HIROBO Turbulence - SDX - Freya - Sceadu > Evo 50 crash
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