ChopperAddict's Hints & Tips


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   SAFETY - WARNING - Why do we have 5V and 6V servos & switchable BEC's etc ?

Many people get confused about input voltages for radio system and servos.

The problem is that many servos are listed as capable of operating on anything from 4.5V to 6V

Equally, Some ESC's or the BEC's provide switchable output to let you choose 5V or 6V output to your radio system.


It may seem obvious that the higher the voltage, the more powerful the servos will be, and to a certain extent that is true, so why don't we always just use the 6V setting.

The first thing you need to do is to check your radio RX to ensure it is happy to accept 6V, some DO NOT.

If the RX is OK, move on to checking your servos.  If you have the EXACT same type for all  your servos, and it is suitable for 6V, then fine - go ahead.  However, if you have am mixture, which is quite common as many people use a more exotic servo for the rudder, you must ensure that ALL OF THEM are 6V compatible.

The next question that comes up is are your servos analog or digital. ?  Why you may ask ?

Well, digital servos take more power to drive them than the comparable analog servo.

Also, and even more importantly, you need to check your ESC/BEC combination to see how many servos it is capable of supporting  at both 5V and 6V. You may be quite surprised to discover that the ESC cannot provide enough power at 6V to handle your basic 4 servos, much less any others you may have for retracts etc.

To go 6V you may have to get yourself a more powerful ESC/BEC that can handle 4 digital servos at 6V.

A final warning - Check the gyro, as they may not like a different voltage, and also, be very careful before  you connect the rudder servo to the gyro that it is the correct type.  Many gyros have a switch to let you tell it if the servo is going to be analog or digital.  If you connect the wrong type of servo, you can FRY the servo or even the GYRO


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