Landing gear sequencer - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-31-2006, 07:28 PM   #1
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Landing gear sequencer

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Just thought I'd pass along some info.

I had bought a gear sequencer made by EMS Jomar in California intending on using it in my Typhoon to control the gear and inner gear doors. This unit is roughly the size of a box of matches. It has 2 pots for adjusting gear and door servo delays and has 4 switches, for setting door position, gear storage, door servo reverse, and simultaneous or sequential gear servos. Not bad for (if I remember correctly) $40 US.
The only problem is that the gear must be set up so that the gear is down with the servo is in the wide or 2.0 msec position and extended with the servo is in the narrow or 1.0 msec position. That's all fine and good if you A. can figure the narrow and the wide out, B. read over and fully understand these instructions, C. don't by the wing with the servos already installed and just sheet over the whole shooting match because you know the builder is an excellent builder and lastly D. read the instructions before you sheet over the wing.
I found out the hard way that the sequencer sees my gear down as up and visa versa. What to do?? Rip a newly finished wing to pieces to get at these retract servos. Aaaahhhhh, I kinda wanted to avoid any cost. I dug around the net and found:

GDC gear sequencer made in Winnipeg! After reading an article on the website from RCM magazine and e-mailing Geoff, we determined that his sequencer should work. The cool thing about his sequencer is you do the programing. You purchase an adapter cable ($15) that goes between your computer and the sequencer and you download the program from his site. And you follow the easy instructions. Select gear doors open, double click on the "doors open slot" and it automatically puts the numbers in that slot. So the sequencer knows, when it sees this value the door servos are in the open position. You then repeat for doors closed and then continue on with the gear servos. After that you can manually put in 0-9.9 second delay into the door servos on the close cycle to allow the gear to get into the bay first before starting to move. You can also click the "Slow door servo" box so the doors have a more realistic speed, instead of snapping open and closed.

Oh ya, the GDC sequencer is solid state, no pots to adjust, or vibrate loose etc, and is about 1 1/2"x3"x1/4" and weighs a few ounces.

Though it did cost more (about $80 US with the cable, module, freight and GST ) The GDC sequencer was a much better design, easier to set up and use. How's that for a little bit of Canadian technology!!!!!
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Chris Rebidoux
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Old 05-31-2006, 08:25 PM   #2
Mike Sebastien
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I have the Jomar gear sequencer installed on my Corsair and I had the same issue. I solved the problem by installing a inline servo reverser on the gear servo.

Everything worked out great once I got everything moving in the right direction.

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