We recommend using a switching BEC to power Ruby rather than powering directly from a battery pack or using the the BEC built into your ESC. This provides an ideal constant 5.0-5.2 volts input efficiently, without the possibility of overheating.

See Ruby requirements for more info.

For smaller planes with 4 or fewer micro-servos, we've had good experience with the ParkBEC by Dimension Engineering. We prefer it because it's the smallest available and combines power and throttle signal in a single connector that can be plugged into Ruby's Throttle channel without requiring removal of the ESC power lead or occupancy of an additional Ruby servo connector. The pass-through throttle channel is particularly convenient because it frees up one of Ruby's servo ports and doesn't require modification to the ESC's servo plug.

Other switching BECs such as those from Castle Creations may also be used, but most require that the center lead of the throttle connector be removed, and that the BEC plug into a separate unused channel on Ruby.

NOTE: We've found that although it is advertised to support up to 6 micro servos, the ParkBEC cannot support this many servos plus Ruby without excessive dips in output voltage when all servos are moved. The Castle CC Bec is recommended instead for planes with more than 4 micro servos, or for planes with full-sized servos. [info / buy]

ParkBec 5 volt Switching BEC

Price: $19

If you have a pending Ruby order, select the shipping method labeled "Pickup $0.00" if you'd like this included in that shipment.