DX8 setting
Were you using telemetry? Did you check the Flightlog data after the incident? What was the minimum voltage on the Rx bus? Without this information any diagnosis is going to be a pure guess.
When control was lost did the throttle return to idle? Without any other info whether or not the throttle went to failsafe may be the only clue to what may have happened.
Pre-set Failsafe could tell you also, if you set it correctly (i.e. the throttle would drop to your pre-setting on a "hold".) Also, a servo may have failed. I had an aileron servo jump to and lock in the full UP position. Flipped the plane right over shortly after take-off.
The AR7000 receiver lost power in the crash, battery plug pulled out of the receiver. A123 battery had 6.6 volts, fails was set for low throttle and neutral on all control surfaces. I had a telemetry module in the plane to monitor engine temp, rpm and rec voltage. The best I could tell the engine did not throttle back and was buried about 6 inches in the dirt.
Receiver lost power after the plane hit the ground, battery with switch harness was several feet away from the receiver.
If it went to failsafe, then it was most-likely a communication loss. Given that I fly my Giants way out there, I doubt it was the DX 8. ( I have two DX8s). Did you ever read the flight data to confirm that your Rxer and Remote Rxer were positioned optimally? Were there any wires or conductive material by them? I once attached a remote Rxer with silicone sealant and it was registering 3 times a many fades as the other two remotes, which were not fastened in place with silicone. I removed the silicone and used servo tape the now the fades are nearly identical on all three Rxers, each flight. Did you have the remote Rxer installed? Did you do a range check?<o></o>
I would rebuild and do a "positional Range Check." (i.e. Have someone move the plane around to all angles, etc. while in the range check) and then read the flight log data. That will tell you if you got things positioned correctly or have an RF interference. I would even try this with the engine running and do it about as long as you ran the plane when the plane crashed. <o></o>
The data log readers are invaluable when you are trying to troubleshoot this kind of problem. The readers are worth their weight in gold, if you are not using telemetry. If you have telemetry going, the Flight data reads out on the DX8. You can use that readout “real time” to gage how far you really can go out there w/o loosing the plane. You see fades = no problem. You see a lot of rapidly accumulating fades = watch closely. You see a couple rapidly accumulating frame losses = you are getting close to the limit. Once you see a hold, then you better have her turning around back to you. A hold registers when you have lost the connection to the plane. Several holds and you most-likely have momentarily lost control of the plane<o></o>
http://www.horizonhobby.com/products...ht-log-SPM9540.I never see ANY fades or Frame losses, and even if you did have a RF link problem, its doubtful that link loss is going to drive all servo's to their extreme. Since you are flying a gas motor, I really doubt battery problems.. besides you said that bench testing the system everything works. Are you bench testing with the same airborn pack?
I have a good deal of experience with the Ugly Stik, and it is a pretty solid airframe, but is it possible that the aileron hinges on one side came out?
Another personal "Pet Peeve" and constant harp of mine is the current lack of concern that new modelers have for metal to metal contact.
Everybody assumes that modern day 2.4 Ghz radio's are immune to spurious RF, but I still bow to the electric Gods and have NO metal to metal contact or for that matter use of fuselage long wire rods. (I use Nylon rods).
I would like to know more about what you find and suggest you really dig into potential reason for failure.
Thanks
KKKKFL
But, the only thing that would drive them full up would be a failed servo or pilot error. Given that two servos failed simultaniously, that rules out failed servos.
I would do the positional range check and check flight log data. If all the Rxers' fades are about the same and you get 0 frame losses and 0 holds, I would fly it.