Configure a Gear Door and Landing Gear Sequencer¶

The Sequencer mix drives multiple output channels forwards and backwards on independent, curve-shaped timebases — a natural fit for landing gear and gear door sequences, where doors and retracts need to move in a specific order with specific timing.

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This example sequences a gear door (channel 7) and retracts (channel 8): the doors open first, then the gear retracts, then the doors close again — all from a single switch.

Before configuring anything, plan the timing — a stopwatch against the real mechanism is the easiest way to get real numbers. Consider whether gear doors should move in a scale-like ramp or snap open/closed, and whether the retracts themselves need a smooth ramp or a simple step (e.g. retracts that just take a switch-style signal).

1. Assign the gear door and retracts channels first¶

Naming these Outputs channels before building the sequencer means they already have readable names when you pick the sequencer's own output channels. This example uses CH7 for the gear doors and CH8 for the retracts.

2. Add a Sequencer mix¶

In the main Mixes screen, tap + and add a Sequencer mix, placed after the last existing mix.

3. Configure the sequencer¶

Name — e.g. "Gear Sequencer".
Active condition / Flight modes — as for any other mix; default is Always on.
Loop mode — leave Off (a continuous forward/backward loop is more useful for something like a servo tester than for landing gear).
Forward condition / Backward condition — the switch positions that trigger each direction, e.g. switch SF down for forward, SF up for backward.
Forward duration / Backward duration — the timebase each direction runs over. This example uses 6 seconds each way.
Outputs — Output1 → CH7 (Gear Doors), Output2 → CH8 (Retracts).

Output1: gear door curve¶

Tap the ⋮ menu on Output1 to edit its curve — 5 points by default, up to 21. For a 6-second sequence with scale-like door movement:

Points 1→2 ramp from −100 to +100 over 1.5s (doors opening).
Point 2 is where the retracts (Output2) should activate.
A 1-second gap follows, to give the 2-second retract cycle room to complete before the doors start closing.
Points 4→5 ramp back from +100 to −100 over 1.5s (doors closing).

This adds up to 6 seconds total, and — importantly — the same curve works for both forward and backward operation, since it's symmetric.

Output2: retracts curve¶

Tap Output2's ⋮ menu. If the retracts expect a simple switch-style signal rather than a ramp, edit the forward curve to step instead of ramp — set point 3's X value equal to point 2's, which turns that segment into an instant step rather than a slope.

Add a backward curve (from the same menu) if the retract timing needs to differ by direction — the curve editor shows a direction arrow once both curves exist, to keep them distinguishable. In this example, the backward curve moves the step to point 4 instead of point 3, so the retracts come up as soon as the gear doors have finished opening.