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Jun 01, 2019, 11:01 PM
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Mini-HowTo

Getting a switch to turn SAFE On and Off on AR 636 RX


Spektrum technical recommends:

1. Start with a new model and not an existing model.
2. Bind it with the bind plug removed. Make sure receiver is blinking when you bind.
3. In System Setup Channel Assign assign a switch to turn SAFE on or off. Any switch can be used between channel 5-9. The gear channel is 5. If the gear is used for retracts then use channel 6 to activate switch B. I like to use Switch B because it’s the easiest to toggle on and off with the left forefinger pad. The middle position (1) can be set to On or Off.
4. Move both sticks to lower inside position. In the monitor screen make sure throttle, aileron, elevator, and rudder are showing plus or minus 100 percent.
5. Toggle switch B between stops (0 and 2) until you see a “twitch” in the elevator. Stop toggling when you see this and confirm the switch works by holding the model nose down and tail up. SAFE On should give you up elevator. Turning it off should give you neutral elevator. Put model into a bank. The upper wing aileron should raise trying to level the wing. If you don’t get this re toggle the switch again.
6 Once the switch is working you can name the model, select wing type (flaps), throttle, cut, rate switches, mix switches, and audio.
7. On first flight turn SAFE Off and trim the model at what ever minimum power is to maintain altitude (roughly 50 percent throttle) then land. If FM (flight modes) are used then trim for each flight mode such flaps up, take off flaps, and landing flaps. Mark where elevator is on fin or rudder and put the trim back to neutral. Turn clevis in or out to get elevator to marked position. Do the same with aileron and rudder clevis’s. The goal is to fly hands off so when SAFE is On it’s easier for the gyros. Remember SAFE On will not correct for a model that is out of trim.
8. Fly a second time and confirm trim is in the ballpark. Trim again making sure you wait 3 seconds before moving sticks.
9. Turn SAFE On. Confirm bank and pitch limits. Confirm flap elevator compensation works to keep fuselage level or slightly nose down with landing flaps. If there is a big difference in pitch between SAFE Level On and Off then assign your Self Level On/Off switch to a FM (flight mode). Vary the trim for each switch position ( B0,1,2) so that the elevator trim is the same as when SAFE is Off. Test fly to verify.
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