Safety-Trim is an electronic speed control system for standard electric trim servos found on many homebuilt aircraft. It replaces other speed controllers and relay modules with an electronic solution that resolves issues such as
run-away trim and failure to operate conditions.
Safety-Trim greatly simplifies trim switch wiring, especially when installing
pilot and co-pilot switches. Safety-Trim is available with 2 Speed
operation, allowing automatic high and low speed trim actuation.
SAFETY-TRIM HD IS NOW AVAILABLE. FOR SERVOS UP TO 10 AMPS!
Online ordering (click here)
Download the Installation Manuals
Tim Olson had to say about his installation in his RV-10
the video that Don made of his Safety-Trim installation
servo controller with speed control run-away protection
operation prevents trim servo run-away conditions
limited to 3 seconds per trim switch actuation
function switch allows pilot to recover from a stuck or failed trim switch
many other components, no extra relay decks or speed controllers needed
wiring, no extra parts needed for pilot and co-pilot trim switches
Designed for standard
electric trim servos, such as the Ray Allen T2 & T3 series
available for servos up to 10 amps.
proof, reverse polarity protected
1 axis, 2
axis models available
adjustable, 1 speed and 2 speed models available
Experimental aircraft only NOT TSO'd
Made in USA -- US patent 7,719,200
We are proud of our products
and our installation manuals, we would like you to take a close look.
Our actual product installation manuals are available here for you to download.
We want you to understand how our products work and how to install them
properly. We are trying to raise the bar on the quality of
instruction manuals provided for homebuilt aircraft accessories.
Download the actual product installation manuals :
for single axis controllers:
models ST-1-12v & ST-1-12v-2sp (right click to save a copy)
Instructions for dual axis controllers: models ST-2-12v & ST-2-12v-2sp (right click to save a copy)
Instructions for HD model : model ST-1-12v-2sp-HD (right click to save a copy)
Wiring Harness Detailed Drawing
Pre-made wiring harness
Visit our Application Notes page important details on typical installations
single axis intelligent servo controller
ST-1-12v-2sp single axis
intelligent servo controller w/ 2 speed presets $245
ST-1-12v-2sp-HD single axis
servo controller w/2 speed presets, Heavy Duty $245
dual axis intelligent servo controller
ST-2-12v-2sp dual axis
intelligent servo controller w/ 2 speed presets
air speed switch for triggering 2 speed function
Wiring harness available: We offer an aircraft grade wiring harness for
all models. The wiring harness is 8ft long, color coded and utilizes
mil-spec wire and connector terminations. Additionally, it includes
the recommended ON/OFF/Reverse switch.
Single axis models:
Dual axis models:
A paypal account is not required to order, just a credit card.
Ordering by mail or by phone:
TCW Technologies, LLC.
2955 Main Road East
Emmaus, PA 18049
OR CALL: 610-928-3420
Your phone call or email is always welcome!