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Crashed? Discussion and Photos > Century predator flies on it's own Opinons please!!
 
 
realtorjdf
Heliman
Location: wayne,nj

I was hovering 6 feet off the ground and all of sudden the helicopter just takes off into a massive forward flight..running a jr 649 pcm receiver and jr 9303 radio,could this be anything but the receiver or crystal.The heli then hit the ground not to bad what the hell would cause it,revolution whip mounted on side of tank away from any other electronics please your opinions-THANKS
05-18-2007 Over year old.
 
 
rudyy
Veteran
Location: E. Amherst, NY, USA

Did you have a crash before on that heli? My initial thoguhts would be that you have a malfunctioned servos (maybe the gear is stripped) on the cyclics that you are not aware of.

Rudy
05-18-2007 Over year old.
 
 
realtorjdf
Heliman
Location: wayne,nj

Never ever crashed this heli before,but before it spooled up it was jumping forward,should have never flown it BIG MISTAKE on my part,I really don't think it could be the servos anything else-Thanks
05-18-2007 Over year old.
 
 
gmebey
Veteran
Location: Fort Collins, CO

I had a transmitter once that would go full forward cyclic (down elevator) for no reason. It was intermittent and unpredictable.

My recommendations are to tie the heli down to a bench using a lazy Susan to allow it to rotate. Spin up to full head speed and exercise the cyclic. Be careful!!!!! Not to use to much roll cyclic since this heavily side loads the skids and could break loose.

I know this sounds a little bit over board, but I do this to all my helis after a crash or any major repair. I have even used this same method on 90 size birds.

After a few minutes I notice on mine that it went full forward cyclic, I hit Throttle Hold and sent the TX back into Futaba for the 2nd time....another story not for this post

"Once you are in RC you are in for life. You may go away but it will draw you back." By an
05-18-2007 Over year old.
HOMEPAGE  
 
 
realtorjdf
Heliman
Location: wayne,nj

Good idea but for now I will send the reciever in and see what they say I really hope they say it's bad,that would be an easy solve-Thanks
05-18-2007 Over year old.
 
 
realtorjdf
Heliman
Location: wayne,nj

I never ever had a problem with my 9303 radio and own about 10 planes and 1 gasser heli,flying the planes I never had a problem for over 2 years on that radio-Thanks again!
05-18-2007 Over year old.
 
 
gmebey
Veteran
Location: Fort Collins, CO

Still consider my idea when you get it back up and going. Just finding one problem pays for the time it takes.

"Once you are in RC you are in for life. You may go away but it will draw you back." By an
05-18-2007 Over year old.
HOMEPAGE  
 
 
shuttlepilot
Elite Veteran
Location: Mullins, South Carolina

I've had this happen with a bad servo. Everything worked fine on the ground at idle, but when I spooled up, the servo would sometimes have a mind of it's own. If you have a spare reciever, you could give it a try before you send the reciever that is suspect off....could just be a servo.

Gas is Great
QWW Field Rep
05-18-2007 Over year old.
 
 
realtorjdf
Heliman
Location: wayne,nj

When the heli went down I actually stripped 3 jr 8311 so those are going in to get fixed and checked along with the receiver,so what you are saying is if I had only 1 bad servo that could make the heli completley just scream into forward flight on it's own Wow never would expect that!!
05-18-2007 Over year old.
 
 
shuttlepilot
Elite Veteran
Location: Mullins, South Carolina

Well, the culprit was the servo at the front of a 120 ccpm setup. i don't know if it caused it to go "screaming", but it certaintly pitched nose down and started going forward, then would all of a sudden be ok.....go figure.

Gas is Great
QWW Field Rep
05-18-2007 Over year old.
 
 
rudyy
Veteran
Location: E. Amherst, NY, USA

Like I said, you probably got a stripped servo that you are never aware of. Once the stripped gear fails to hold the servo arm position, then your heli will definitely scream in one direction. For your case, you said it screams forward. My best guess would be your elevator servo is stripped.

Rudy
05-19-2007 Over year old.
 
 
BlakeMcBrayer
Elite Veteran
Location: Georgetown, Ky

realtorjdf

How did or did you have the fail safes set?

It is possible that you had some interference and the Rx went to fail safe with improperly set values. Thus leading to the uncontrolled flight.

Once it went into it's own flight, did it stay smooth or did it move around? Was the engine sound constant or changing?

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Don't come off the throttle untill you see your GOD!
05-19-2007 Over year old.
 
 
realtorjdf
Heliman
Location: wayne,nj

Engine sound was constant and the forward flight was smooth until it flipped over and went in,I had no control at all-Thanks
05-19-2007 Over year old.
 
 
BlakeMcBrayer
Elite Veteran
Location: Georgetown, Ky

How did or did you have the fail safes set?

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Don't come off the throttle untill you see your GOD!
05-19-2007 Over year old.
 
 
realtorjdf
Heliman
Location: wayne,nj

To be honest I don't think the failsafe had anything to do with it.This is what was happening...As I was throttling up the heli was jumping forward like glithing forward I should have never flown it something was wrong from the start I was to anxious to get it in the air,then it was flying great for 3 minutes and then just flew away on it's own and went in MY DUMB MISTAKE,- AGAIN NEVER SHOULD HAVE FLOWN IT
05-19-2007 Over year old.
 
 
BlakeMcBrayer
Elite Veteran
Location: Georgetown, Ky

Not to argue, but they could have had A LOT to do with it.

PCM receivers usually don't glitch. When a source of interference is present on your frequency, a bad crystal, or anything that interferes with the Rx getting it's signal, it goes to it's fail safe settings, only to come out when a good signal is present again.

Non PCM receivers will glitch, they just keep trying to do the best with what ever signal they are getting. Whereas a PCM Rx will go into fail safe at a set point of weak signal or interference.


Did you set the fail safes or did you leave them at there default?


Wrong setting or defaults for fail safe could have been why it took off into forward flight. If they were for example, positive pitch, forward cyclic and almost full throttle, then it would have done exactly as it did. Take off into smooth forward flight, with nice smooth engine sounds.

The jumps forward when you were spooling it up sounds like the same thing. It was going into fail safe for only a brief moment, jumping forward then getting a good signal back and responding to your transmitter again. Again if your fail safes were positive pitch, forward cyclic and increased throttle, it would make a jump forward only if in fail safe for a second or so.

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Don't come off the throttle untill you see your GOD!
05-19-2007 Over year old.
 
 
realtorjdf
Heliman
Location: wayne,nj

Thanks for your help,but someone else had set up everything for me not really sure how my failsafes were set,maybe I need some help are you familiar with the 9303-Thanks
05-19-2007 Over year old.
 
 
realtorjdf
Heliman
Location: wayne,nj

Went into faisafe mode and all channels are listed in hold none of the channels were in f.s.any comments on this thanks
05-19-2007 Over year old.
 
 
daved26
Senior Heliman
Location: NJ USA

REALTORJDF,

Did you ever solve the problem? This just happened to me last weekend. Same thing...just hovering and all of the sudden the heli gets a mind of its own for a millisecond and moves hard left then everything is fine. I landed the model and shut it down immediately. I checked everything. All looked good on the bench so I tried again. This time the model jumped about a foot in elevation and then all was under control. I landed the model safely and put it it away. I think its the servos.

This happened to me about 4 years ago when I was just learning forward flight- only I was about 100ft up, lost control and never regained it. Needless to say, I crashed. Prior to this event, I did notice the heli jump in flight once or twice (I should have stopped flying it at that point but I didn't). I sent the receiver, gyro and rudder servo in to be checked. They checked out ok. So I got a better battery and some better servos and the heli has been flying great ever since.

Both helis are eCCPM.

Dave

"I wish my 9C had a reset button"
08-07-2007 Over year old.
 
 
realtorjdf
Heliman
Location: wayne,nj

I had a bad servo,not sure about the 8311's anymore,I acually may change to hitec digitals!
08-07-2007 Over year old.
 
 
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Crashed? Discussion and Photos > Century predator flies on it's own Opinons please!!
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