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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Post incident data collection,( I crashed trying to figure out what happened).
06-05-2011 03:04 AM  9 years ago
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Bouchah

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Willow Spring, N. Carolina USA

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Post incident data collection,( I crashed trying to figure out what happened).
Bird : Hirobo SDX
Servos: 9252's 9254 tail
Gyro : 401
Blades: Edge LE-603
Moror : HZ-55

-What happened before this flight;
I had flown twice in a row, while refueling for the third flight I thought about trying some new blades that I won at IRCHA last year, the Edge LE-603. I put them on and off It went. The blades I had been using were Roto-tech 600, the yellow and black ones.

-Here is how it went down;
I was at the top of a loop stayed inverted traveling horizontal across the sky, pulled back on the cyclic stick to come out of the loop at about 40', the heli was upright at about 25' but kept decending towards mother earth. It was like It lost all capability of lift.

-What I found on the head;
Both mixing arm rods are evenly bowed pretty good and one of the pitch rods was popped off the mixing arm. The fly-bar was bent on one side but was not touching anything.

-What I am wondering;
Are edge blades that much different than Roto-tech that when I pulled back on the cyclic it bent the mixing arm rods? Could the mixing arm rods have bowed in the crash? Why did it loose lift?

-Crash damage (so far);
Boom
Main blades
Fly-Bar
Bent mixing rods
stripped tail servo gears
lost canopy grommet
Blade 130x (5)
Trex 550 V2 (18)
Shuttle ZXX
Freya Xspec (20)
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06-05-2011 08:44 PM  9 years ago
tacohd86

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Imperial,Missouri-Un ited States

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No the edge blades wouldn't cause your problem.Those edge blades are as good as any of them.I take it that as you came out of your loop you did move from negative pitch to positive as the Heli became upright.All your bent parts were caused by the crash and not by the blade change.But I have found out that whenever I do a blade change to always re-check my pitch settings because they can change when switching from one style of blade to another."Fly it like you stole it"
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06-05-2011 09:06 PM  9 years ago
Bouchah

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Willow Spring, N. Carolina USA

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Yes I moved the stick in the positive range, all the way up the closer the bird came to the ground, nothing positive happened though. I have heard about pitch settings changing with different blades, I did not change anything when I put the Edge blades on. I was a couple minutes into the flight when the incident happened, until then everything felt ok for how I fly.

Someone I spoke to about this was wondering if it was a brown out. I am new to JR equipment so I didnt think to check for blinking lights before killing the power. The tail servo gears stripped and the servo was making noise so I hurried to shut it off trying to spare any further damage. My son did ask me why the motor didnt cut out when I hit the throttle cut. I didnt think of it at the time but I know my cut switch works and also the slider on my radio cuts the motor as well, neither one worked.
Blade 130x (5)
Trex 550 V2 (18)
Shuttle ZXX
Freya Xspec (20)
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06-05-2011 09:19 PM  9 years ago
tacohd86

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Imperial,Missouri-Un ited States

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was the battery still connected after the crash.If so and your throttle cut off would not work it kinda sounds like you had some kind of power failure either in the Heli or in the radio.Did you check your receiver pack voltage and transmitter pack voltage after the crash."Fly it like you stole it"
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06-05-2011 10:35 PM  9 years ago
RM3

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Killeen, Texas - USA

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Im with taco, sounds like you lost power to the RX during the flip to the upright position.showing a preference will only get you into trouble, 90% of everything is crap...
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06-05-2011 11:13 PM  9 years ago
Bouchah

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Willow Spring, N. Carolina USA

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The radio (an 11X) reads somewhere around 10.3 volts, I have not checked the rx battery voltage. However, I had just charged the battery before going out and only put 2 1/2 flights on it. 2 days prior I put 5 flights on that battery and put 1100 mAh back in for a full charge. It is a 2600 mAh lion pack.Blade 130x (5)
Trex 550 V2 (18)
Shuttle ZXX
Freya Xspec (20)
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06-05-2011 11:15 PM  9 years ago
Bouchah

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Willow Spring, N. Carolina USA

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Yes, the battery was connected after the crash.Blade 130x (5)
Trex 550 V2 (18)
Shuttle ZXX
Freya Xspec (20)
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06-05-2011 11:53 PM  9 years ago
RM3

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Killeen, Texas - USA

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well thats a tough one...based on what you have said so far.
1.your servos were still working so the RX system was still operational.
2. you hit throttle hold but the engine was still running and did not go to idle or shut off.
3.no matter how much positive collective you gave it, it was still falling.

was your throttle linkage still connected, that could have come off

or

you had a fuel problem when you flipped, like air in the fuel line causing the engine to sputter..

or

you had a brown out or signal glitch and the RX kept the servos just where they were waiting on the TX signal

beyond that I have no other idea, maybe someone else does, the only other thing I can think of could be that you failed to give the Heli Gods thier ritual sacrifice.
showing a preference will only get you into trouble, 90% of everything is crap...
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06-06-2011 12:06 AM  9 years ago
RM3

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Killeen, Texas - USA

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I did have a faulty one way bearing once that gave a similar effect a while back...showing a preference will only get you into trouble, 90% of everything is crap...
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06-06-2011 12:07 AM  9 years ago
tacohd86

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Imperial,Missouri-Un ited States

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Yeah I run the same packs,2600 Li-Ion and I get an easy 5 flights out of them.All I can suggest is get it back together,set it up,and then do a couple of 5 or 6 minute bench test with the same receiver pack were you just sit there and work all your servos for 5 or 6 minutes.I had a brand new 2600 Tenergy pack that I lost power and crashed with.I benched tested that battery at a full charge and found out that the battery would just cut out completely at any time.It would go from 8.4 volts to zero at any given moment.I would unplug the battery and then plug it back in and it would be fine until all the sudden it would cut out again.Turned out the overcharge/undercharge protection circuit board was bad.I opened the battery up and removed the circuit board and the battery has been fine ever since."Fly it like you stole it"
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06-06-2011 01:23 AM  9 years ago
Bouchah

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Willow Spring, N. Carolina USA

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I'm home from work now, going to check it out a little closer. Thanks for the tips, so far.Blade 130x (5)
Trex 550 V2 (18)
Shuttle ZXX
Freya Xspec (20)
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06-06-2011 11:11 PM  9 years ago
Bouchah

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Willow Spring, N. Carolina USA

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The rx battery voltage with a 1 Amp load was at 8.03 volts. That should be plenty of power left to not have problems from the battery voltage anyway.Blade 130x (5)
Trex 550 V2 (18)
Shuttle ZXX
Freya Xspec (20)
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06-06-2011 11:35 PM  9 years ago
Heli-on

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Southern Cali, CA - USA

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When you do your rebuild, check to make sure the washout base isn't moving past the posts. When that happens - game over.

RM3's suggestion of OWB is good, too. If the bearing is able to move up and down in the hub, it effectively mashes the main gear up into the frame when you give it positive collective.
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