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M-PWR-2X Dual Channel Variable Speed Trim Control KIT

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0.07 KGS
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Product Description

The M-PWR-2 is a two-channel variable speed trim motor control device developed primarily for amateur-built aircraft applications.  This product is also available as a fully assembled unit. See the project page in The Hangar Workshop for the open source documentation. This product has two options, the open source M-PWR-2X version and the enhanced M-PWR-2A.  Please select the M-PWR-2A using the check-box below the price.

The device features two all-electronic motor drive channels in one compact package, capable of controlling Ray Allen (RAC) or Firgelli servo motors directly.  Fast and slow motor speeds are independently adjustable for each channel and are selectable using an external sensor or EFIS serial airspeed information.

Each motor channel is capable of driving up to 1.2 amps with input voltages from 8 to 18 volts.  Protection is provided against voltage surges and reversed polarity on all inputs. 

As an open source hardware design, the M-PWR-2 device is a platform for development.  Basic two-channel variable speed trim motor control is provided in the Baseline (X-suffix) version and users may develop their own firmware using the provided driver source code as a starting point.  The M-PWR-2 uses a Microchip PIC13KF22 CPU and is compatible with the readily available MPLAB IDE and PICKIT development tools.

An enhanced feature set is available at extra cost by upgrading to the A-suffix version microcontroller.  In this M-PWR-2A device, the on-board low-voltage RS-232 interface extracts serial airspeed information from Dynon SkyView or Garmin G3X EFIS air data streams.  This information may be used to replace or augment physical airspeed or flaps sensor switches.  The airspeed threshold is easily set in flight by using an external pushbutton switch and indicator lamp.

A unique feature of the A-suffix upgrade is the ability to detect and correct a stuck input trim switch or wiring fault. When a fault is detected, a lamp is illuminated, the faulted input is ignored and the external pushbutton switch is used to temporarily assume control of the input until the fault is corrected.  Since the lamp and switch are required for EFIS mode indication and airspeed threshold programming, there is no extra hardware cost in providing input fault detection and correction.


Motor Compatability List

The following are typical servo motors used to control trim systems in amateur-built aircraft.  Any motor with up to 1.2 Amp stall current is usable with the M-PWR-2 device.


Ray-Allen Company (RAC)

Model                          Stall Current

T2-7A                           800 mA

T2-10A                         800 mA

T3-12A                         800 mA

T4-5                            400 mA

Firgelli Technologies

Model                          Stall Current

L12 series                    450 mA

L16 series                    650 mA


Technical Summary (M-PWR-2X Open Source Version) 

  • Dual trim motor control capability in one compact package.
  • 1.2 Amp drive capability for each channel with short-circuit and over-temperature protection.
  • Drives common Ray-Allen or Firgelli servo motors.
  • 8 to 18 volt operation with surge protection.
  • Independently adjustable high and low motor speed settings for each channel.
  • High or low speed selection using an external flaps or airspeed sensor switch.


Enhanced Operation (M-PWR-2A Version)

  • In-flight programmable EFIS airspeed threshold for motor speed selection.
  • Trim switch fault detection and correction.



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