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Aileron / Flaps with DX7

As the manual can be hard to understand I think we need more guides to tell people how to program the DX7.

As I will use 4 servos on my Skywalker I had to find out how to program the DX7-radio.

This assumes you connect AR7000 like this:

  • Ch. 1 Throttle
  • Ch. 2 Right Aileron
  • Ch. 3 Elevator
  • Ch. 4 Rudder
  • Ch. 5 Left Aileron (Listed as Gear Channel on Receiver)
  • Ch. 6 Right Flap (Listed as Aux 1 on Receiver)
  • Ch. 7 Left Flap (Listed as Aux 2 on Receiver)

System set-up
To begin setting up the transmitter, press and hold the down and select keys, and turn the radio on, then release the down and select keys.

I assume we start with a clear model in memory – if not select one available.
(ACRO model type)

Input Select Set Up
Press the up key until you get to the Input Select function. With the arrow pointing at Aux2, press the increase key until it says INH next to Aux2. Press the select key and the arrow should now point at
Aux2 Trim, this should say INH, if it does not, press the increase key until it does. Press the select key again and the arrow should point at Flap. This should say SYSTEM, if it says something else, press the increase key until this says SYSTEM. Press the select key, and the arrow should now point at flap trim. Press the increase key to set this to INH
This completes the system set up mode, press the down and select keys to exit the system mode. Do not activate flaperon in the wing type menu for this set up. All settings in the wing type menu will remain at the default setting of OFF.

Function Mode
Function Mode
Next we will set up the function mode of transmitter. When you first turn the system on, the system will request you to confirm the channel of operation by pressing the clear key. Once you have confirmed the proper channel and have insured that no one else is on your frequency, press the clear key to use the system. Press the up and select keys together to enter the function list. After completing each step below, press the up and select keys to get back to the function list. To enter a function below from the list on the system, press the down and select keys together with the arrow pointing at that function.

Dual Aileron Set Up
To set up the dual ailerons, we will set up a program mix. We will use program mix 5 for this purpose. Enter program mix 5. Press the increase key until the first channel says AILE. Then press the select key to make the arrow point at the second channel, then press the increase key until the second channel says GEAR. Press the select key to make the arrow point at RATE, then hold left aileron and press the increase key until the percentage says +100%. Then hold right aileron and press the increase key until the second percentage says +100% as well. Both values should say +100%. Next to SW on the screen it should say ON. If it says something other than ON, press the select key to make the arrow point at SW, and press the increase key until it says ON.

Dual Flap Set Up
To set up the dual flaps, we will set up a program mix. We will use program mix 6 for this purpose. Enter program mix 6. Press the increase key until the first channel says FLAP. Then press the select key to make the arrow point at the second channel, then press the increase key until the second channel says AUX2. Press the select key to make the arrow point at RATE, then press the increase key until the percentage says +100%. Then flip the flap switch until the arrow moves to the second mix value, and press the increase key until the second percentage says +100% as well. Both values should say +100%. Next to SW on the screen it should say ON, if it says something other than ON, press the select key to make the arrow point at SW, and press the increase key until it says ON.

Servo Reversing
Set your servo reversing correctly so that each surface goes the correct direction. Do this by entering the REV SW. function. Press select to choose the channel to reverse if needed, and press increase or decrease to reverse the current channel selected. If the flaps go up with the flap switch in the down or LAND position, reverse the direction of channel 6 (FLAP) and/or channel 7 (AUX 2). In most cases in this set up, channel 7 or aux 2 will need to be reversed.

Sub Trims
Set the sub trims as required leveling the control surfaces. Do so by entering the SUB TRIM function. Press select to choose the channel to adjust, and press increase or decrease to adjust as necessary. Try to keep these as close to zero as possible. Using too much sub trim can result in running out of travel on the servos, and the possibility of over-driving the servos.

Travel Adjustment
Set the travel adjustments such that you get the control movements required. To adjust this, enter the TRAV ADJ. Function. Consult your Ultra Stick manual for the required control surface travels. You may need to use 1” long servo arms to achieve the maximum travels listed in the manual. Try to use as high a travel adjustment value possible to achieve the throws so that you use as much of the servos travel as possible. Press the select key until you get to the GEAR channel, then press the decrease key until the travel of the gear is 0%, then flip the gear switch to the other switch position, and repeat, making the travel adjust in both switch positions 0% for the gear channel. This will inhibit the gear switch from affecting your ailerons.

Flap System
Enter the FLAP SYS function. Press the select key until the arrow points at the UP flap value. Press the decrease key until this says U 50%. Adjusting this value will adjust how far the flaps will go in the center position, though you can also make small adjustments to the MID position next to flaps later for final set up. Center the flap servos after setting this position, with the switch all the way up. This is done so that you will not run out of travel for aileron to flap mixing for fast rolls. Next press select until the arrow points at the flap setting in the LAND position, press the increase or decrease value to adjust this value, you will set this value as needed to get the flap travel needed with the switch in the land position. Next press select so that the arrow points at the ELEV value for the LAND position. Press the increase or decrease value as needed to get roughly ¼” down elevator with the switch in the LAND position.

This is text copied from the guide at horizon hobby

1 comment

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  1. UndCon

    Thank’s for the pingback!

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