If you have no voltage then a failsafe wont work! NO POWER = NO WAY TO RETURN SERVO TO BRAKE OR NEUTRAL!!!! A failsafe has to have some sort of power to make the servo return to a preset position and this is where the spring comes into play! The biggest micsonception about failsafes is that they will work without power, this is simply NOT TRUE! If you have no voltage/no power then the failsafe can't give the command to the servo to return to the preset position. If the servo has no power to hold it's position the return spring does its job and makes the servo go to full brake or neutral depending on how you have it set up. An easy way to test this is to try to move your servos without the receiver power turned on, they will easily move in either direction, Now turn the power to the receiver and transmitter on and try to move them, as long as they have signal the servos will hold. Failsafes are designed to make the servo's go to a preset position if the signal is interupted or lost so in essence the failsafe is good only as long as you have power and a good signal to the servos. I hope this clears this up.

J