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-   -   Servo for Landing Gear Doors ? (https://www.rcuniverse.com/forum/questions-answers-154/5511608-servo-landing-gear-doors.html)

BalsaBob 03-04-2007 10:44 PM

Servo for Landing Gear Doors ?
 
I am in the process of installing pneumatic (air) retracts. The plans call for the gear doors to also be pneumatic/air actuated (with seperate air cylinders). I am concerned about the potential for air leaks (more fittings, cylinders, etc) so I am considering using a servo to open/close the gear doors. I could use a sequencer so the gear would retract/actuate first, and the door servo would actuate a few seconds later. Any issues/problems with this plan ? Am I mising something that would not make this a viable option ? Thanks. Bob

KojakDave 03-06-2007 09:55 AM

RE: Servo for Landing Gear Doors ?
 
I am interested in doing the same thing..any ideas on how you're going to do it? (Two microservos or one standard servo, etc)

Dave

FallDownGoBoom 03-06-2007 01:27 PM

RE: Servo for Landing Gear Doors ?
 
On paper, your plan should be fine. If you use a Jomar door/gear sequencer, there are connections for door and gear servo's, as well as a pair of potentiometers that you use to adjust the servo speed for both the gear and door actions.

That's on paper... I haven't tried it on a plane as yet. My Bonanza will use a servo to open the inner gear doors, then retract them after the gear goes down. The servo linkage for the inner gear doors is simple, and all I did was tie the outer doors to the struts. In theory I could use a servo(s?) to do the nose gear doors, but space limitations make this difficult, so all I'm going to do is a hinged door that the gear pulls shut as it closes.

And since I'm in the middle of the prime/sand/prime/sand (repeat multiple times!)/paint cycle, how it really works 100 feet off the ground is probably a couple of months out.

BalsaBob 03-06-2007 02:38 PM

RE: Servo for Landing Gear Doors ?
 
My plan is to use a single servo (metal gear) ..... the doors (for each main) are fairly close together. I will be using the Jet-Tronics sequencer. This sequencer allows for many options ..... including seting the amount of delay (in seconds) for servo activation(s).
Bob

joey_snaproll 03-06-2007 05:06 PM

RE: Servo for Landing Gear Doors ?
 
I have a Jomar unit in my Mustang ,I use robart air retracts and a servo to cycle the inner doors, works great. Will work with mechanical retracts too.

Joe

KojakDave 03-07-2007 05:57 PM

RE: Servo for Landing Gear Doors ?
 
My main question is how to do the servo to door linkage and servo positioning. I'd like to see pictures/diagrams/videos to get an idea.

Dave


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