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Yes, this helped a lot. I was aware that both ESCs and servos can come with BECs but wasn't sure if I needed both to have them.
The bec is a battery eliminating circuit.. old school rc needed a battery supply from 4 aa batteries. we now have ubec that hook directly to supply voltage to supply servo .esc. and any other thing that needs a supply voltage to operate. the esc has a bec on it most are highly underpowered for todays electronics.. a servo as told above can use a major amount of power some can need 8 amp+ on hard turns or if in use..I've had some High end servos use this ..so if you get a esc with a 5 amp bec and your servo is rated as a 4amp then Id go with a ubec of 2x that.. and the pull the center wire outa of the receiver plug from esc .that is the + power of esc bec. we now use a wide range of voltages from 8.4 to 4.8 and some higher than what I listed.. check your voltages needs and go from there...servocity is a good reference for servo specs,horn size.voltage torque.hope to see some vid of these edf boat. its getting to be fall in my state so prepping my boats 4 winter storage