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HelicopterMain Discussion › Crashed BAD and motor kept going!?!?
02-16-2011 10:34 PM  6 years agoPost 1
Stephen Born

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USA

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I just hit the pavement real hard with my 400 electric. I shut the throttle down as soon as it happened, but the motor, main rotors kept spinning at the hightest RPM. What would cause this?

Any help/suggestions would GREATLY be appreciated fellow heli guys.

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02-16-2011 10:40 PM  6 years agoPost 2
Gyronut

rrProfessor

Martinsville In.

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You have trashed either the spd control or the rcvr or both.

Rick

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02-16-2011 10:43 PM  6 years agoPost 3
Stephen Born

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USA

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Should I just replace both the receiver and the esc?

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02-16-2011 10:47 PM  6 years agoPost 4
jschenck

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La Vista, NE.

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move the servos to make sure they don't have stripped gears then --

unplug the ESC from the RX, plug in a standard battery pack and see of the radio will move the servos ok. That'll tell you if the RX is still good or not. If it is then I'd unplug the servos and try just the ESC to see if you can spin up the motor.

Are you sure that your throttle hold is setup correctly? Were you in idle-up? Throttle down speeds up the motor if you are in idle up. Learn to hit throttle hold when it wrecks, not throttle down.

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02-16-2011 10:51 PM  6 years agoPost 5
classic

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All over the place!

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That was the phenomomon known as the "Funky chicken dance"!

Everyone who flies R/C helis will most likely have their beloved heli someday experience the phenomomon known as "The funky chicken dance"

This is where after a seemingly normal crash into the ground where 99.9% of the time the heli motor will die or stop, but instead the motor still runs and then usally goes to full throttle with no radio control thus causing the heli to desperatly trash itself into as many little pieces that it can before running out of fuel or battery power.

Welcome to R/C helicopters!

Which is worse, ignorance or apathy? I don't know and I don't care!

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02-16-2011 10:53 PM  6 years agoPost 6
Stephen Born

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USA

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I was not in idle up. I was flying overhead and the tail started to spin. I had NO control over the tail. I tried to get to the ground as easy as I could but without control over the tail it was impossible. Hit hard on asphalt, and I lowered the throttle. I did NOT hit throttle hold though. I actually had to step on the tail boom as I unplugged the battery. Blades RIPPED through the lipo, it's garbage.

As far as starting the motor with the esc, I cannot do that because linkages were destroyed, servos stripped, mainshaft, feathering shaft all destroyed. Total rebuild.

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02-16-2011 10:56 PM  6 years agoPost 7
Stephen Born

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USA

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CJames

That is EXACTLY what it did. Pieces flying everywhere. This is the first time this has ever happened to me.

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02-16-2011 10:56 PM  6 years agoPost 8
classic

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Sounds like you may have lost reciever battery power. Many times the tail is the first thing to go when battery voltage gets too low.

Sorry for your loss!

Which is worse, ignorance or apathy? I don't know and I don't care!

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02-16-2011 10:58 PM  6 years agoPost 9
Stephen Born

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USA

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I had a full charge on my radio and a full battery charge 2200 MHz lipo.

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02-16-2011 11:04 PM  6 years agoPost 10
classic

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After it happened to me, I always check my batteries with a battery checker before every flight now.

Which is worse, ignorance or apathy? I don't know and I don't care!

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02-16-2011 11:08 PM  6 years agoPost 11
TaylorDrain

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California

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Always hit throttle hold when the tail let's go to stop it spinning. I have had the tail let go from a bad servo or tail design and applied collective to gain altitude and hit throttle hold to save it with a auto. Sorry to hear about your crash

Taylor

A.K.A TayloMadeUAS.Inc

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02-16-2011 11:20 PM  6 years agoPost 12
heli-cuzz

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Pittston, Pa. USA

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Sorry to hear that.
Its sucks to have a bad crash and it continues to thrash itself after the fact.
I had somewhat of a similar situation flying my NOBAR50 last summer.
The regulator + wire unsoldered from the board.
Bet you've never witnessed a NOBAR50 nitro with no radio contact.
I was doing traveling aileron tic-tocs when it let go. It was ugly as soon as it happened.
All of the sudden the disc went into a menacing wobble{I was like Uh-oh}
The tail pointed straight up to the sky and gravity took over. I hit t-hold and nothing. The engine stuck at full throttle as the heli nose dived into the field.
Still stuck wide open as I sprinted to the heli to kill the motor.
It didn't chicken dance though. It has a 2 stage belt drive system and the main belt jumped off the pulley.
All I have to say about that is... I'll never fly a cheap Align regulator again.
That's 2 for 2 failed power wires on the Align regs.
I'll take two strikes and I'm out. lol ReactorX2 regs for me in all my nitros.

Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90

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02-17-2011 12:44 AM  6 years agoPost 13
Stephen Born

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USA

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Thanks everyone for all your input. Everytime I look at it I get upset. BUT, then I reflect on the fact that I didnt have to go to the E.R. with a slashed face. Man, this happened in a blink of an eye. This is my first mechanical malfunction. Let there be no mistake, this was not pilot error. I have always been into heli safety. In fact, I have a RC Heli Accident video on YouTube. But having this happen to me today showed me the real dangers of heli flying.
Again, thanks for everyone who responded. I did need advice, and I was hoping someone out there could tell me what went wrong. In conclusion, with the feedback I received, I believe it was the ESC or receiver. And I now know what a "Chicken Dance" is, and I hope I NEVER see that again. The rebuild will give me something to do this weekend.

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02-17-2011 06:06 AM  6 years agoPost 14
69maverick

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thomaston,ct

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Radio?

I don't think you said what radio you were using. I had the same thing happen with my DX8 and it was a radio issue. It just lost connection with the RX I was able to reproduce it on the bench with the receiver that was onboard at the time and a different one as well.

Jim B.

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02-17-2011 08:32 PM  6 years agoPost 15
Stephen Born

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USA

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I was using a DX61 Spektrum.

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02-17-2011 08:50 PM  6 years agoPost 16
Hellsiege

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Colorado Springs, CO

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Had same thing happen to me, it's on youtube "blade 400 chicken dance". I never did figure out what caused it as when I rebuilt both the ESC and Receiver seemed to operate fine. Always figured that first impact unplugged the ESC or caused it to lock up and until it eventually flung the battery off I had to just watch - throttle hold and low throttle on the stick made no impact. Was using DX6i at the time, phoenix 35 (governor mode) ESC, scorpion motor etc..

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02-17-2011 09:46 PM  6 years agoPost 17
Stephen Born

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USA

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lol! The day this happened to me, I watched the same video. Last night as a matter of fact.

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02-17-2011 10:36 PM  6 years agoPost 18
Hellsiege

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Colorado Springs, CO

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Yeah, I tried to win the ReadyHeli video crash contest with it, but came up short. I always thought only nitros could chicken dance, but we proved that one wrong didn't we

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02-19-2011 05:13 PM  6 years agoPost 19
Stephen Born

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USA

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Now I am questioning if it was the transmitter. I flew my mSR today, and it works fine. Does this mean I can rule out transmitter, and just narrow it down to the receiver and ESC issue?

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