Q-140: I’ve read with interest about the use of failsafe devices with our RC systems. I know that a failsafe function is usually only available on the higher-priced, top-of-the-line RC systems. I’ve heard that you can purchase add-on failsafe devices and adapt them to just about any RC system now on the market. Could you provide me with a specific example?
A-140: I kept a copy of this letter in my camera bag as I toured the Toledo Weak Signals RC Expo in Toledo, Ohio. While passing the Electronic Model Systems (EMS) booth, my attention was drawn to a Single Channel Failsafe device. This tiny add-on unit (measuring 1.5 X 1.5 X 0.75 inches and weighing .5 ounce) can impart a failsafe function on any one (single) servo in your RC system. The failsafe works with any 4.8 to 6.0 volts servo.
You plug your servo into the EMS failsafe device, then plug the cable exiting from that device into the channel function of your choice on your RC receiver. If your RC signal is lost or interfered with for 1-8 seconds, the servo connected to the failsafe will shift to an adjustable pre-set position. The most common application would be on the throttle function of your RC system. With the lost of signal or when being interfered with, the throttle servo would rotate to low throttle or the idle position.
You could, of course, use the failsafe for any single channel function such as ailerons, elevator, or rudder. The failsafe has been designed to work with AM, FM, and PCM (when set to the PPM mode) RC systems. You can order one of these devices by calling (800) 845-8978. More information can be found at the EMS Web site: www.emsjomar.com.