As can be read on the first page (Home).....I ordered on 13 july 2013 a motorized throttle quadrant at Revolution Simproducts. I payed 90% of the price in advance .......BUT....... it's now 29 december 2014 when I write this page and I still wait for that TQ.

In spite of several emails, promises and requests for refund Eren Yavi continues to behave like a criminal and refuses to deliver or to refund my payment or to answer on my mails.

I therefore dicided to construct my own TQ.
My inspiration I got from the website from  Scholdan Mogens, a Danish simmer.
Here is the link to his website:

A Belgian simpit builder (Rudy) also did build his own TQ and publiced some great looking pictures on his website. I used this pictures a lot for my own TQ.
This is the link to that site:
The Ultimate goal
The used materials for the TQ  are: Trespa, MDF and aluminium.
I use trespa for the gears, handles and timing pulleys.
The meterial is easy to mill, cut and dril and threading.
The parts for one of the throttle handles.
The timing pulley are downloaded from

Then altered in an editing program for CNC machines like Vcarve.

The timing pulley has 72 grooves, 5.08mm pitch and a beldwidth of 9.5mm.
The gear for the potmeter has 80 tooth and is module 1.
The gears are drawn with a CAD program and then exported to Vcarve.
The parts for the throttle handles assembled with the panels. The messing tube is the axis for the handles and will guide the axis for the trimwheels.
The parts for the speedbrake.
The idle handles.
The flaphandle
Both the trimwheels are drawn and drafted in Aspire 3.0 and afterwards milled with my Zoltar CNC - router. As shown in the YouTube films below.
An exploded view of the left throttle handle with reverse levers.
<  In Aspire..............The result  >

The assembly of the various micro limit switches for the purpose of the various flap positions. When taking in use it turned out that the switch of position 25, to be in a wrong position. The red button, which is visible in the picture, is the back of the potentiometer of the throttle. The photo also shows the switching wheel of the idle lever.

In the first picture the TQ is temporarily assembled to detect any errors. It turned out that I had forgotten the wiring for the TO / GA and AT Disengage pushbuttons. In the second picture the devastation after the dismantling of the entire TQ.
Indeed, for the relevant wiring, the complete throttle handles had to be dismantled, and those were precisely the components that were installed at first. In the last picture the TQ is again assembled WITH the forgotten wiring. Later on, it turned out that there was an other error in the design. The package panels mounted on the right side of the TQ was too thick because there was one panel too much mounted. For this error it was not necessary  to dismantle the entire TQ. I had only to disassemble the shaft, to curtail the shaft with 6mm and  to remove one of the panels. Then it was a matter of reassembling and sanding the right side of the TQ.

In order to fasten the aluminum sheet and the holders for the background illumination, I mounted M3 self-locking nuts with epoxy glue in the MDF panels. First drill a 6mm hole with a depth of 10mm Then add a little epoxy glue, then place the nuts on long M3 screws. The M3 bolt should not stabbing through the nut, or the bolt is also glued. Use the length of the bolt in order to put the whole 90 degrees with respect to the panel. Let it dry overnight and the result is as shown in the pictures.
For the various holders for imprints and backlight I used 4mm acrylic that has a light transmission of 30%. With the aid of a milling machine, I have first made the pocket for the LED strips, and thereafter I established the curveture with the backingoven at 120 degrees.  I only applied the heating with the backingoven to the flap indicator. The other holders I warmed up using a paint burner and then bent into shape.
Imprints are made with a regular printer and photo paper. This paper is thicker and dose not pass too much light. For LED strips I use Cold White, 120 LEDs per meter, 12 Volt, available from
The pocket in the container should be deep enough to prevent the LED strip to make contact with the underlying aluminum cover of the TQ. In practice it proves to be sufficient to drive the lighting with 7 to 8 Volt. The nominal voltage of 12V appears too bright to provide light. I have therefore put a dimmer in the various ledchains.

The first picture shows the mounting plate with the motors. The upper two motors are stepper motors type 42BYG, 12V and available from  On the axis of these motors is a pulley with 24 teeth and two limit switches. The limit switches were originally intended to be included in the software in order to mark the beginning and the end position, and thus to protect the stepper motor. Later, this turned out to be a wrong choice and now the limit switches are included in the circuit of the respective enable signals from the respective drivers.
The trim DC motor for the trimwheels is mounted on the underside of the motor plate. This is a DC motor, type Modelcraft RB35 with a transformation ratio of 1:50. The motor can be obtained at
Mounted on the shaft of the motor is a belt pulley with 14 teeth. On the axis of the trim wheel is a pulley mounted with 42 teeth. The stepper motor for the speed brake (spoiler) is not fitted. For now, the speed brake only feature some limit switches and is not (yet) automated.

The first picture shows the electronics board, such as this will be shifted  in the TQ. On the electronics board are the two stepper drivers mounted (the two black boxes). These are like the stepper motor itself also ordered at Kiwi Electronics.
Also visible are the Arduino motor shield, where two DC motors or 2 stepper motors can be connected (for speed brake and trim wheels). Among them is the so-called. Due Arduino / Mega R3 Screw Shield. This I ordered at an aquarium shop in Portugal.
Under this great screwboard is the Arduino Mega 2560 hidden. The input and output configuration is here. As can be seen all the cables are to be connected.
The various wires and cables are connected and the Throttle Quadrant is ready to be placed in the cockpit. Following this placement it still has to be programmed. When programming, I use Visual Studio 2015, the community version and an interface between Arduino and FSX.
I use the excellent interface program Link2FS Multi for FSX for Experts. This is an open source program that works fine with FSUIPC and IFly2FSUIPC. The program can be found on this website

After a few flights were made, it appeared that the limit switches that were installed to protect the throttle handles and stepping motors to rotate too far, did not work well. It turns out namely, that the command to move the stepping motor from a start position to an end position is only terminated when the stepping motor has done the required number of steps. In other words, if the motor is 10 steps from the end position removed and gets the instructions to make another 50 steps, the program never detects the limit switch input. So I put the limit switches of the respective stepper motors in series with the output enable for the drivers. When the limit switch is activated, the stepper motor stops. A next command to turn into  the opposite direction, the steppermotor will smoothly performed this command..