I'm about 1/4 the way into building a Jerry Bates bearcat, and am starting to scratch my head about how to sequence the gear doors. The bearcat has inner doors that stay down when the gear is down. I plan to use a retract servo for the tailwheel, a mini servo for the doors, and Lado for the mains. (I only ordered the Lados last Halloween, so I can't experiment yet).

From what I understand, with the Jomar sequencer you can't adjust the endpoints, so it would be a ton of work to adjust one servo to operate both doors well. So....

I'm thinking of trying a JR Channel Expander on a 3 position Tx switch.
Position 0: gear down/door down
Position 1: gear up/door down
Position 2: gear up/door up

This should make the setup a bunch easier, you can set the kickpoint of the retract servo/Lado at position 1, and the kickpoint of the door servo at switch position 2. Plus you can set the door servo endpoints to give exactly the throw you need instead of tinkering with two sets of door linkages. Plus you can run a separate battery for the whole retract side. Down side, there is the risk of hitting position 2 too fast on takeoff and crushing a door.

Of course, this is all in theory since I don't have the Lados in hand yet. And I won't order the sequencer until I hear back on why this might not work.

Any thoughts?