If you do not want your expensive R/C model to crash or disappear forever when the radio link fails or is subject to heavy interference, you need to preload your model with servo settings that ‘take over’ under adverse radio or battery conditions ensuring a landing that’s as gentle and safe as possible. This circuit does it all, and more!The Multi-Channel Failsafe was developed to prevent damage to radio controlled models when the on-board radio control receiver starts to receive erratic control information, or when the craft supply voltage drops below a predefined ‘safe’ level. Detection of corrupt frames in the received signal is handled by a microcontroller. At a certain level of insecurity, the micro loads a number of servo settings from an EEPROM that (hopefully) result in a safe landing, or at least, minimum damage to the model. The most important setting in these cases is, without doubt: cut off the engine (i.e., get it to idle)!