N5C Crash CGY750?

[flyboynellor]

Hi guys,
Just had an unexpected radio problem?. Unfortunately the glitch resulted in me crashing my beloved Synergy N5C FBL. The crash wasn't that bad. In all fairness the heli with the same receiver(R6203SB) and CGY750 has been through a previous crash but have flown several flights with no problems. The previous crash was a low altitude dumb thumb move. I didn't send in the receiver for a checkup after that crash. My bad. I also have installed in the N5C a CGY 750 controller. On this last crash I was flying my typical FAI style making a smooth left hand turn then out of the blue the heli banks hard right. I managed to get it back for a second and lost control for a second time. The receiver and the 750 has been through two crashes. Just for point of reference the receiver antennas are oriented 90 degrees to each other as per Futaba.I'm also running a LiFE 6.6 v 2100 mah battery through a Gryphon Extreme regulator. Yes I checked the battery voltage after the crash and it was at 6.6 volts. I did a post flight range check and got my previous 100 paces= 300ft. More than adequate range. What to do? Replace the receiver and fly the 750 again? Or send it all in for a checkup? Have you guys had any similar glitches? I thought Futaba with its freq. hopping technology was immune to glitches? Or is the problem with the 750? Thanks in advance for the help.

[Tommy Wagner]

Did you look at the servo horns between crashes? Thinking could have been a stripped or damaged horn?

[flyboynellor]

Unfortunately I didn't. One of the servos horns were broken post crash. I don't know if it was broken as a result of the crash or before. With a push pull setup on the servo I don't think it would cause a crash. What do you think? Thanks

[scotty82]

 Hi,

Sorry to hear about your crash:( Hopefully you get it back in the air soon.

A couple of things that came to my mind straight away.

1. The SBUS lead came loose between the Rx and CGY750.
2. A sensor error on the CGY750.
3. The live part of your antenna touched one of your carbon fibre frames.

I could be wrong but these are some ideas.

Cheers
Scott

[Kevin Dalrymple]

Any pics of how your wires are routed? I would like to know how the wire for the 750 sensor is run.

Reason is I had a cut on mine, so I moded my servo cassette.

[flyboynellor]

Thanks for all the reply's. To answer scotty82 All my servo leads were intact including the Sbus cable. I have never gotten a sensor error on my 750. Both antenna are routed to not come in contact with the frame. I checked my sensor wire connection to the 750 and no loose connection. I even wiggled the cable and no loose connection. I have the sensor wire wrapped back over itself several times to take up the slack and zip tied. No cuts in the cable. Keep the comments coming. This crash really has me baffled. In all the years I've flown Futaba I have never experienced any radio issues. If the receiver and 750 comes back with a clean bill of health I will replace the 6.6 volt Life battery for a higher capacity 2S Lipo. The only reason I tried the Life battery was most of the N5C guys are running the battery. As it stands with a 2100 mah Life I can only fly two time before having to recharge. Battery physical size was the primary consideration. Thanks again.

[Kevin Dalrymple]

How much mha did you put back in the life pack?

[scotty82]

Yes I was going to ask that too. The CGY750's seem to use between 250 to 500 mAh per flight. I have a 5200mAh Fromeco LiIon pack.

What are your failsafe settings?

Also what is your battery failsafe voltage set on the CGY750?

[flyboynellor]

I did recharge my 2100 mah LiFe and I put back 938 mah. I haven't looked at my battery fail safe on the 750. I will and post the findings. Thanks