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Safety-Trim Intelligent Servo Controller
Price range: $233.86 through $436.03
Designed for standard electric trim servos, the Safety-Trim Intelligent Servo Controller (Safety-Trim) is an electronic speed control system for experimental aircraft. Safety-Trim provides the directional switching function as well as the adjustable speed control function needed to drive electric trim motors with a time limited operation of the trim servo motors that reduce the possibility of run-away trim and failure to operate conditions. Safety-Trim is an important safety feature that is short circuit proof and reverse polarity protected.
Models are available in single or dual axis controllers, 2 speed presets for high and low speed trim actuation that allow separately adjustable trim speeds for different flight configurations. Safety-Trim is also available in a single axis heavy-duty model for DC trim motors and linear actuators rated for operation at 12 volts and up to 10 amp.
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Description
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 by common problems, such as stuck, welded or inoperative input switches, inadvertent contact of 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.
Stand alone trim models are available in single or dual axis controllers, 2 speed presets for high and low speed trim actuation that allow separately adjustable trim speeds for different flight configurations. Both the regular single-axis and dual-axis models also have a reverse function. Safety-Trim works for applications involving DC trim motors rated for operation at 12 volts DC and up to 1 amp. Safety-Trim is designed specifically to operate electronic servo motors, such as the Ray-Allen T2 and T3 series and also has an output which may be used to power the Ray-Allen trim position indicator (14 volt operation only, up to 100m Amps max).
Safety-Trim is also available in a single axis heavy-duty model for DC trim motors and linear actuators rated for operation at 12 volts and up to 10 amp.
Safety Trim is also available in two servo booster models for autopilot systems in either 12 or 24 volts. Safety Trim Servo Booster is designed specifically to receive input commands from compatible autopilot systems, such as the Garmin G3x GSA 28 or a traditional dpdt type rocker switch. Safety Trim Servo Booster operates DC electric servo motors up to 10 amps of rate current.
Safety-Trim products are protected by US Patent 7,719,220
Stand Alone Trim Models:
- Single axis servo controller (ST-1-12V)
- Single axis servo controller with 2 speed presets (ST-1-12V-2SP)
- Single axis servo controller with 2 speed presets- Heavy Duty (ST-1-12V-2SP-HD)
- Dual axis servo controller (ST-2-12V)
- Dual axis servo controller with 2 presets (ST-2-12V-2SP)
Safety-Trim Servo Booster models are also available that can receive input commands from compatible autopilot systems such as the Garmin G3x GSA 28 or a traditional dpdt type rocker switch.
Autopilot Servo Booster Models:
- Single axis servo booster, 12 volt, 10 amp (ST-1-12V-10A-BSTR)
- Single axis servo booster, 24 volt, 10 amps (ST-1-24V-10A-BSTR)
| Weight | 1 lbs |
| Dimensions | 9 × 6 × 3 in |
Safety-Trim Intelligent Servo Controller Specifications
Non-Certified
| All Safety-Trim Single and Dual Axis Servo Controllers |
Input Voltage *: | 10 – 30 volts DC |
Output Voltage: | User adjustable 6-12 volts DC, 1 amp maximum |
Inputs: | Trim switch inputs, closures to ground pilot/co-pilot switches wired in parallel 2 speed switch, closure to ground |
Output: | Time limited, controlled DC voltage to servo |
Wiring: | Standard 15-pin D-sub connector (male on controller) pre-made wiring harness with ON/OFF/Reverse switch available |
Enclosure: | Overall dimensions 5.7” x 2.5” x 1.5” UL 94V-0 rated material, 60°C max temperature |
Weight: | 6 oz. |
*2 speed models: factory calibrated for most RV aircraft; user adjustable. Units are furnished complete with detailed instructions. Standard 15 pin D-sub female connector required on the aircraft wiring harness (not included with the Safety Trim Controller).
For Experimental Aircraft Only, not TSO’d
Safety-Trim Servo Booster Specifications
Non-Certified
| ST-1-12V-10A-BSTR | ST-1-24V-10A-BSTR |
Input voltage: | 10-15 Vdc | 20-30 Vdc |
Output voltage: | PWM follows autopilot signals | PWM follows autopilot signals |
Output current: | 10 amps max, DC motor drive | 10 amps max, DC motor drive |
Input signal: | Direct autopilot connection | Direct autopilot connection |
For Experimental Aircraft Only, not TSO’d
Instruction Manuals
- Safety Trim Single Axis Controllers (ST-1-12V and ST-1-12V-2SP)
- Safety Trim Dual Axis Controllers (ST-2-12V and ST-2-12V-2SP)
- Safety Trim Single Axis Controller – Heavy Duty (ST-1-12V-2SP-HD)
- Safety Trim Servo Booster (ST-1-12V-10A-BSTR and ST-1-24V-10A-BSTR)
- Safety Trim Servo Booster – Autopilot Interface (ST-AP1)
- Air Speed Switch Details for Safety-Trim(ASW-1 and ASW-2)
- Safety-Trim Application Note – Multiple Switch Wiring Details
- Safety-Trim Application Note – 2 Preset Operation and Switch Detail
- Safety-Trim Application Note – Airspeed Switch Wiring
- Safety-Trim Application Note – FPS +Plus Wiring Diagram
- Safety-Trim Application Note – Instructions for Changing from Ray Allen Relay Decks to a Safety Trim Controller
- Safety-Trim Application Note – Using Ray Allen RS 2 Rocker Switch with Additional Hat Switches
- Safety-Trim Application Note – Using Ray Allen RS 2 Rocker Switch with no other Switches
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