Guys,
Had a weird problem at the field yesterday. I was flying my Electric Yak and in the air whenever I give any two inputs at the same time to my Rudder / Elevator / Ailerons, then my motor drops power and ultimately cuts off!!
There is absolutely no mixing done in my Tx. The motor has a separate 4s 3300 mAh Lipo fully charged connected to it through a very reliable 60A Dualsky ESC. The 2.4Ghz Futaba 7 channel Rx has a 1300 mAh 3s Lipo connected to it through a Dualsky UBEC.
I would have lost my plane twice. It tracked fine during takeoff and the intial run was smooth but when turning, I give elevator and aileron inputs and then the motor dropped power and cut off even though I was at half throttle, and the plane stalled.. Lucky to have recovered it and landed it off the tarmac on the grass!! This happened twice and the second time, the plane toppled over after landing on the grass and the canopy had a crack!!
While testing on the ground after the two crashes, I followed the below procedure..
1. Connected everything as usual and throttled up. Smooth power delivery and the motor was acting perfectly normal
2. Gave it elevator input, still fine. Gave it aileron input (without elevator) and no prob. Tried rudder input and was fine.
3. Now when I give both elevator and rudder together, the motor started slowing down and then I tried juggling the throttle and no response and the motor quit even when I was at half throttle.. All the other control surfaces were perfectly normal.
4. Tried changing the flight pack. No use.
5. Tried changing the Rx pack with another Lipo. No use.
6. Now comes another weird part. Removed the Lipo/UBEC and connected a direct 6V NiCd pack to the Rx. The motor did not even arm. It just kept beeping continously. Tried a 4.8V NiCd pack and still the same thing.
7. Put in the Lipo / BEC and tried again now. THe problem stated in the steps 1,2 and 3 repeated itself. Got really fed up and packed up!!
I am really stumped because even if the servos are acting up the motor should not quit as it runs on a separate pack.
Someone please give me some suggestions! The next thing I am about to try is changing the Rx and trying!
All information on my setup can be found at,
http://www.indiarc.com/forum/index.php?topic=2124.0- Chan