- TCW Technologies Safety Trim

Safety-Trim is an electronic speed controller designed specifically to operate the electric servo trim tabs found on many experimental category aircraft. Safety-Trim does more than just provide the switching and speed control functions typically used to operate standard servos. It provides an important safety feature that greatly reduces the possibility of run-away trim conditions. The technology implemented in Safety-Trim ensures that the trim servo (s) being operated are not accidentally driven to the limits of their travel. Safety-Trim guards against run-away trim conditions caused by common problems such as stuck, welded or inoperative input switches, inadvertent contact o input switches and failed electrical components. Additionally, Safety-Trim provides a way to recover from an inoperative trim switch allowing the pilot to get the plane trimmed back to neutral. Here's how it works: Every time a button is pressed on a trim switch, Safety-Trim provides regulated power to the connected electric servo for no more that 3 seconds. If a button sticks or is inadvertently contacted, the servo actuation is automatically limited to 3 seconds of movement. By setting the output voltage on the speed control feature of Safety-Trim you decide how much trimming occurs to your plane during each button activation. If you let go of a trim switch button before the 3 seconds are up, the servo stops moving immediately. Additionally, Safety-Trim has a reverse switch that allows you to recover from a stuck or failed trim switch and get the plane trimmed back to normal. Simply move the on/off/reverse switch to the reverse position and you’ll get up to 3 seconds of reverse trim for each actuation. Models are also available with 2 speeds presets that allow separately adjustable trim speeds for different flight configurations.