Originally Posted by soundcheque
After losing 3 planes last year to lockout situations I now have external BEC's installed on everything I own.
Unfortunately many ARTF's have ESC's fitted which really don't have that much headroom to cope with multiple servos.
I undestand that Hitec have been producing receivers now which have the facility of allowing separate power to the receiver only which in turn allows a dedicated voltage to be supplied to the servos therefore maintaining a constant supply to the receiver..
I have a Hitec radio system, and I still use external BECs as well as using the direct-to-battery power for the RX. Admittedly, this is overkill since the RX power is good down to about 4? volts. That is, a 3S battery would have to be way beyond dead and the RX would keep going. The RX is powered off the main battery, in parallel with the ESC power. This also gives automatic real-time telemetry of the main battery voltage, which allows longer flight times.
Given how well the Hitec system has been working, I am now putting BECs only on my larger planes where I expect lots of servo load.