Originally Posted by dglo
Question: The more I research the subject, the more confused I get. Should I install a seperate switching bec? I'll be using a scorpion commander 70 amp esc with a 5v 4amp linear bec on 3s lipo. From what I can figure out this is kind of borderline as to wether to use a seperate bec or not. Any help? I'm using 2 Hitec HS635HB servos on elev and rud and 2 HS225BB servos on the ailerons.
Go to Dimension Engineering's website, read FAQ's on when you need to use a switch mode BEC and what amp rating you need for 3S and four full size servos. ( I use their Park BEC's rated at 1.5 amps for 3S lipos, 2.4Ghz receiver and four or more small servos. They have BEC's with higher amp rating for larger stuff/better safety margin to prevent brownout crashes. Alternative is to use separate flight battery pack to power receiver and servos same as in IC powered model and disable the Scorpion linear built-in BEC. Don't risk a crash with linear BEC.