One way of doing this requires at least a six-channel receiver and uses the GLID(2FLP) glider type. The spoilers are connected to receiver channels five and six. A programmable mix using OFFSET, a simple linear mix, together with the BUTTERFLY mix will accomplish the task at hand. This involves some advanced programming: use the SERVO bar graph display frequently to check your work. Initial setup should be done with the pushrods disconnected to avoid damage if you get something reversed. The signs of the rates of the PMIXes given in the example below may be different; they will depend on how the servos are mounted in the wing (horns to center, v. horns to tips)

1. First, the main glider TYPE should be set to GLID(2FLP) at the parameter menu. (You have to press the dial for one second and confirm to get this setting to ‘take’.) This provides for separate ‘flap’ servo control on channels five and six. These will be used for the two spoiler servos. Then turn ADVANCED>FLAP TRIM to INH. You should also set the channel five and six AUX-CH to NULL. This will prevent accidentally changing the spoiler settings during setup. Finally set BASIC>PARAMETER>ATL TO ON. This will let us use the throttle stick trim control to adjust the spoiler "full open" position.

2. The spoilers are now plugged into receiver channels five and six.

3. PMIX4 is the essential bit of programming in this setup (green). It offsets the spoiler servo on channel six (FLP2) about 70% downward (spoiler closed) from neutral. This gives you significantly increased total throw. This mix should be active when the ‘A’ or ‘butterfly’ switch is in the UP position (away from you.) Setting the LINK function to ON offsets the other spoiler on channel five (FLP1) by the same amount. If it goes upward from neutral, you will need to reverse the channel five servo.

4. PMIX5 outputs the throttle stick to channel six on the receiver (FLP2). These settings are shown in grey on the spreadsheet. This produces linear upward movement of the channel six spoiler to the open position. This programmable mix must be active when the A switch is down (towards you.) Setting the LINK function to ON moves the spoiler on channel five (FLP1) by the same amount. Setting the TRIM function to ON lets us use the trim adjustment on the throttle stick.

5. The rate in PMIX4 (shown here as –70%) should be adjusted so that there is no movement when the ‘A’ switch is flipped up and down. The spoiler servo linkages should be connected and then adjusted to ‘fully closed’ at this point.

6. Landing with spoilers is activated by moving switch ‘A’ towards you and then moving the throttle stick downwards. The BUTTERFLY mix is used to provide any needed elevator compensation. These settings are shown in blue.

7. Perfect "seating" of the individual spoilers in the wing can be obtained by making small adjustments to the channel five and six neutral settings at the BASIC>SUBTRIM menu. The servos should be quiet when these are correct.

8. Coarse adjustment of the "fully open" position of both spoilers is carried out with the throttle stick trim. You can increase the amount of opening up to about 40%. You can also make fine individual adjustments by changing the channel five and six settings at the BASIC>END POINTS menu. Again, the servos should be quiet when these are correct.

9. Notes:

1. If aileron differential is accidentally turned off, channel five seems to reverse. Leave it on or you’ll need to reverse the servo.
2. If you want the spoilers to deploy when the throttle stick is pushed upward, you will need to reverse the signs of the rates in PMIX5. You also will need to change the THR-REV setting to get the trim to work right. Be careful; this will change all the models in the transmitter memory (read page 31 of the manual carefully.)
3. You can even put the spoilers on a slider or knob if you want. For example, you can change the master in PMIX5 from ARBK to Vr-D. You will need to readjust the offset rates in both PMIX4 and PMIX 5. To provide elevator compensation you will need to use an additional PMIX rather than using BUTTERFLY.
4. You can use any of the linear programmable mixes; PMIX4 and PMIX5 were chosen arbitrarily for this example.
5. The ARBK to FLP2 programmable mix can be put on one of the curve mixes if nonlinear spoiler response is desired.
6. The two programmable mixes in this demonstration must have FLP2 as the slave. I haven’t been able to get this to work using FLP1 as the slave.