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HomeAircraftHelicopterMain Discussion › Can anyone help with this problem? It's a big one!
10-25-2009 05:20 AM  8 years agoPost 1
litespeed600

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St. Charles, Missouri

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I have a XPS equipted JR 9303 and 5 receivers. One 6 channel on a foamy, one 10 channel on my 8 foot Telemaster Senior, one 10 channel on a 90 sized electric Raptor heli, one 8 channel on my Trex 450 Pro and last but not least a 8 channel on my Raptor e550 helicopter. On the e550 I had what I thought was a lockout way back and had a crash. Lost all control! After reading about "brownouts" I played with the heli sticks and made the receiver light turn to yellow (I think, I kinda forget what color it was!) and that made the servo's stop for about a second so I just figured my UBEC was not keeping up to the task at hand. I then added a second Castle Creations BEC at 6 volts and 10 amps. Got some 30 flights and then it happened again. I lost all control like the last time. Like the radio was turned off. When I got to the heli the battery had come loose and killed the power. I assumed that for some reason the two BEC just wouldn't work together. I finally said no BEC and went to a 2s1p a123 pack. Today was the maiden flight but also with a Rondo flybarless unit. I did this on my driveway to get the basic settings right and was going to wring it out tomorrow at the field. After about 2 mins of hovering a very wierd feeling heli (this is my first try at flybarless with no supervision! No guru's around here!) all of a sudden it started to drift to the right toward my fence. Again I had no control....nothing. I started moving all the levers and sticks but nothing helped. I even fliped the power off and on and nothing! All of a sudden it went full negitive collective and slamed onto the concrete but stayed on the skids. I still had no control. As I walked up on it spin 550mm blades at 2100 rpm (yea it was way freaky!!!) I could see the green light was still bright on the receiver and the blue like was solid on the Rondo but I had no control still. I stood there wondering what I could do and finally decided to grab a broom stick and try to unplug the main battery. As I walked up to it would jump a bit or the tail would spin a bit. This thing sounded like a pissed off hornet and every time I got close it did something to scare me off. After about 8 to 10 mins the battery started to give out and I was able to disconnect the main battery. I took the heli to my bench with the receiver pack still plugged in and the TX still would not operate anything. I noticed that the tail gyro was still controling the tail servo and it was working, the aileron and elevator gyro/servo's were working also. How can this be? I have no control but the receiver light is still on, the 3 axis Rondo gyro is still controlling the 4 servo's and I can't do anything from the TX???

So here are the facts,

This happened 2 times with the original receiver so for this flight I pulled the receiver out of the telemaster so that rules the receiver out...I think. The a123 pack was fully charged before this flight and after checking with my Watt meter I was still at 6.9 volts, almost nothing was used for this "flight"! The 9303 has a Zippy 2500 mah lipo battery that was charged at the same time as the receiver pack....it is at 12.5 volts. The model is a Raptor e550 6s electric helicopter. I bought it this last Feb to be my 3D machine. All of the components were bought new for it in March. It has 3 DS20xSMD servo's on cyclic and 1 DS20GMD on the tail. The power comes from a stock TT OBL43/11-30H and ACE BLC-75 ESC. At this point I seem to think the only thing that could be the culprit is either one of the 4 servo's or the ESC since these are the only things that have been there all 3 times. I have flown the trex 450 Pro, the 90 Raptor and the foamy since the other lockout/problems and they work fine. I don't believe it's and XPS issue other than the fact the light stays green and I have no control over the model.

How do I check these? Here are the strange things. The Rondo gyro was controlling the servo's when I moved it around. Could the servo's cause a problem and then work normally? The ESC has the ferrit ring on the line to the receiver but is this a fix all? Can interference cause a XPS problem and keep it locked out while the light stays green? The only thing I forgot to check that I wish I had was the back of my 9303 to see if that light was green. What do I do now? What ever is causing this has cost me a couple hundred in parts and I really don't know what to do. I don't want to just toss the servos and ESC I'd like a way to CSI this. I've since pulled on the servo's while moving them and nothing strange seems to happen. I'm clueless as to how I can check the esc.

Help!

Tom

Married with 2 kids, I am no stranger to pain!

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10-25-2009 06:34 AM  8 years agoPost 2
what_the_helli

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cookeville, tn USA

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It is doubtful it is the ESC since your powering the RX directly off the A123 pack. since the rondo unit is working the servos I doubt they are the cause either...My guess is the TX so I would send the radio in to horizon to be checked as it was involved every time also.

I put the fun in dysFUNctional :)
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10-25-2009 07:03 AM  8 years agoPost 3
fritzthecat

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Virginia Beach, VA

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Which version of XPS are you running?
V1 and V2 were very subsceptible to interference. It was called the "it works until it doesn't" syndrome. It caused the system to go into coma mode with no response.
V3 with freq hopping enabled is much better.

Fritz


'Send Money, Women and Guns!'

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10-25-2009 02:32 PM  8 years agoPost 4
billiano

rrVeteran

Greece ,Patras

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For sure it's TX and if it's PCM it turns to failsafe.Or it's the module which is not making contact with TX device instantly.
Good Luck Anyway

Esprit Model Flight Team
Kasama Srimok 90N FBL
TDR Rigid 90

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10-25-2009 03:39 PM  8 years agoPost 5
litespeed600

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St. Charles, Missouri

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Since I have flown other aircraft with the same radio many times since, during and after the "hits" would you still think it was the TX? I have a Trex 450 Pro, a foamy and my eRaptor 710 12s monster that have all been flown proplem free. I betcha I logged over 100 flight between the three and never had a problem.

Hmmm.....

Married with 2 kids, I am no stranger to pain!

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10-25-2009 04:20 PM  8 years agoPost 6
billiano

rrVeteran

Greece ,Patras

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As I know from my real life AirForceTechnisian the first thing to check is the most simple one.
On the other hand Tx when leave from the factory they are tuned for a specific Wave lenght.As time passes by there is a chance of having some circuit solders got thinner ..etc..and as a result to have your TX going wrong.So the best to do is to have it checked.

In my personal experience ..I had a Spektrum DX7 brand new with AR7000 and after 8 flights one of the 2 capacitors in the RX Main unit started floating.All the system runned well but when I pushed the throttle the RX starting blinking like signal loss and finally failsafe mode.

Esprit Model Flight Team
Kasama Srimok 90N FBL
TDR Rigid 90

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10-26-2009 12:18 AM  8 years agoPost 7
Stall_Warning

rrApprentice

NE, Pa. - USA

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I can't tell you what happened, just a couple of thing to
keep in mind.

With loss of signal, the receiver will go to failsafe, the
default is 2 sec. Assuming you set the failsafe for the throttle,
the motor should have shut down. If you did not set failsafe,
the receiver would output last received throttle position.

The ESC would not keep running if it does not receive a signal
from the receiver. If the receiver rebooted and did not
establish communications with the TX, it would not send anything
to any servo. This is different than Spektrum which outputs your failsafe settings. Again, the motor should not run after a reboot
unless communication is established with the Tx.

Hope you find your problem.

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10-26-2009 01:20 AM  8 years agoPost 8
litespeed600

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St. Charles, Missouri

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Funny you should mention that. I took the blades off and fastened the heli to my work bench to see if I could get this to happen again, I could not. But, I did turn off my radio while it was setting still and after a couple seconds the motor started to spin to full speed. When I turned the radio back on it went to a no throttle position like the stick was. Definately dumb on my part in hind sight for not setting the fail safe on the receivers. I will do all 5 this week to 0 throttle. Just as you thought I also believed it would cause the motor to quit IF I lost radio contact. I thought it was strange the other 2 times it did this and now I know something was/is just wrong here.

Thanks for the thought!

Tom

Married with 2 kids, I am no stranger to pain!

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