Setup: Turnigy 9x tx/rx combo with stock firmware on the tx and a CC3D Copter Control flight controller.
Issue: After an unexpected burst of throttle that sent my copter into the ceiling in my house, I rebuilt and completed testing without props. During this testing, I determined that if I turned off the tx with the board still armed, then turned it back on, the tx would send about half throttle signal to the rx for a few seconds - even though the stick was at -100. This issue happened consistently every single time.
Other Reports: After looking all over the Internet, I was able to find only a single other person reporting the exact issue I was having. Being that a lot of people use this tx, I'm assuming this bug may only affect a handful of units.
Resolution: To resolve this issue, I reflashed with er9x firmware, which required modifying the tx with a solderless programming board from SmartieParts.
https://code.google.com/p/er9x/
http://www.smartieparts.com/shop/index.php?main_page=product_info&products_id=331
Lessons Learned:
1. Make it a habit to disarm your board immediately after a landing to avoid situations like this or even accidentally giving the copter throttle by brushing up against the sticks or setting down the tx on them.
2. After all of the modifications I did to this tx to make it adequate, I could have simply purchased a higher quality tx. Also, the 9x gimbals seem to be pretty poorly made and they don't sell replacements for them - only for the 9xr. So now, this tx is somewhat unusable. I've since purchased a 9xr to test out as my "cheap" tx, so we'll see how that goes.
3. Dont' test with props on indoors. But then again - maybe a flyaway is more dangerous? Maybe test outside and tie the copter to a heavy object to avoid a flyaway when testing.
Issue: After an unexpected burst of throttle that sent my copter into the ceiling in my house, I rebuilt and completed testing without props. During this testing, I determined that if I turned off the tx with the board still armed, then turned it back on, the tx would send about half throttle signal to the rx for a few seconds - even though the stick was at -100. This issue happened consistently every single time.
Other Reports: After looking all over the Internet, I was able to find only a single other person reporting the exact issue I was having. Being that a lot of people use this tx, I'm assuming this bug may only affect a handful of units.
Resolution: To resolve this issue, I reflashed with er9x firmware, which required modifying the tx with a solderless programming board from SmartieParts.
https://code.google.com/p/er9x/
http://www.smartieparts.com/shop/index.php?main_page=product_info&products_id=331
Lessons Learned:
1. Make it a habit to disarm your board immediately after a landing to avoid situations like this or even accidentally giving the copter throttle by brushing up against the sticks or setting down the tx on them.
2. After all of the modifications I did to this tx to make it adequate, I could have simply purchased a higher quality tx. Also, the 9x gimbals seem to be pretty poorly made and they don't sell replacements for them - only for the 9xr. So now, this tx is somewhat unusable. I've since purchased a 9xr to test out as my "cheap" tx, so we'll see how that goes.
3. Dont' test with props on indoors. But then again - maybe a flyaway is more dangerous? Maybe test outside and tie the copter to a heavy object to avoid a flyaway when testing.