i have some weird issues with arduplane, I have TowerPro 40A (purple), it only can be initialize if the APM2.0 is powered on first which is a bit problem for me as I power the board using the ESC, if there a way to fix this problem? if I add another Ubec I will need to rewired everything!
I had a similar issue with a cheap ESC.
Turned out to be interference from the 2.4G transmitter making the ESC think the throttle wasn't set to zero.
Solution: Set Transmitter to Range Test mode (which drops the output power by about a factor of 30) and place it away from your arduplane when booting up. REMEMBER to set back to full power before flying!!!
You could also try placing a ferrite bead on the BEC cable. wrap it around about 4 times.
The frequency of the transmitter is not the issue although the length of your BEC cable is probably close to a 1/4 wavelength of your 433Mhz (17.3cm) and may be resonating. Anyway, you can confirm if your ESC is the problem from my last post.