Protech ZOOM 425 ccpm Specifications download pdf (Page 47)

There are two models for 5 volt use, one for up to 29 cells and other for up to 36 cells.

The second is the Firmtronics SBEC. This is a very small and light (8 grams w/o switch) BEC

which can deliver up to 2.5 amps continuous and can work with up to 40 cells. Some people

have reported interference problems with the SBEC on 35 Mhz radio systems, however.

There are now two more choices, which are the Medusa Research "Potencia" 2 amp/6-25 cell

and 3.5 amp/10-33 cell BECs (12 grams). I have not seen any reports from people using these

on helicopters, however.

Dimension Engineering manufactures two BECs which are usable for helicopters: the Park-

BEC and the DE-SW050. The ParkBEC is rated for 1.25 amps and 33 volts of input and in-

cludes a built-in Y-lead. The DE-SW050 is rated for 1 amp and 30 volts of input and requires

some extra soldering to use. Both the ParkBECs and the DE-SW050s can be wired in parallel

to increase the current capacity of the units.

The highest output BEC currently available is the R/C Model Works UberBEC. This BEC is

rated for 3.5 amps of otuput on 3S to 13S lipo. There have been no reports of this used in heli-

copters, however.

General recommendation

• Helis using micro servos (HS-55/56 size): ParkBEC

• Helis using mini servos (HS-81/85 size): SBEC

• Helis using full-sized servos: UBEC

To use the ParkBEC with an ESC with a built-in BEC, the throttle wire should be plugged into

the ParkBEC header and not the receiver. This will automatically disable the ESC's built-in

BEC.

To use the ParkBEC with an ESC without a built-in BEC, then both the ParkBEC and ESC

must be plugged into the receiver (using a Y-lead if necessary). If the ESC is plugged into the

ParkBEC, then the ESC will not receiver 5 volt power and will not initialize.

To use an (non-ParkBEC) external BEC with an ESC which already has a BEC, then you will

need to disable the built-in BEC of the ESC. To do this, check if the ESC has one or two plugs

which plug into the receiver. If the ESC has two plugs (like the Schulze Future 12.46e), then

one of the plugs will have three wires and the other will have only two wires. The plug with only

two wires is the BEC plug. If you do not connect this plug to the receiver, then the ESC's on-

board BEC will be disabled. If the ESC has only one plug (like the Castle Creations Phoenix

series) then the plug will have three wires and the middle wire should be red or orange.

Either pull this red wire out of the connector and tape it with electrical tape to prevent it from

touching other wires or use a servo extension with the red wire pulled out and taped. This will

disable the onboard BEC of this type of ESC.

Some people have reported the SBEC causes interference with 35 Mhz R/C systems. If you

have a 35 Mhz system, you should be careful of the SBEC.

As a beginner, you should use a 5 volt BEC and not a 6 volt BEC. The 6 volt BEC will provide

better holding power for the servos, but this will not be very noticeable unless you are perform-

ing extreme 3D aerobatics. Also, the 6 volt BEC will increase the wear on your servos and de-

crease the servo life.

Helicopter Parts Selection

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Protech ZOOM 425 ccpm Specifications Page 47