Electromechanical Landing Gear Actuators

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cblink.007

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In the course of doing some research on designing a retract system for my bird. I am particularly interested in an electric actuation system. Does anybody know of any actuators out there that are suitable for a light aircraft (ie under 2500lbs). I already have a design for the struts and such...just looking for some actuators! Thanx
 

Victor Bravo

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If there is nothing off the shelf that is perfect for your application, then one of the better quality model airplane brushless motors, and a jackscrew mechanism built into the airframe, will be able to work. Acme Screw, ball-screw, etc.

The Brushless "outrunner" motors deliver excellent torque and much lower current draw than the typical cheap brushed motors.

On the "off the shelf" side of the line, look into the robotics and "motion control" industries, there will certainly be something worthwhile there.
 

BJC

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In the course of doing some research on designing a retract system for my bird. I am particularly interested in an electric actuation system. Does anybody know of any actuators out there that are suitable for a light aircraft (ie under 2500lbs). I already have a design for the struts and such...just looking for some actuators! Thanx
Mooneys used a manually operated system successfully for many years. I don't know how they powered it, but a good mechanical system driven by a linear actuator could be devised. It may take the removal of a strategically placed pin to allow backup operation with electrical failure.

Search for "DC linear actuator."


BJC
 

Pops

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I have used DC Linear Actuators from this company for electric trim servos and Autopilot electric servos operating large trim tabs. Been using these actuators for 8 years. They also make some very large and powerful actuators that might be what you are trying to find.
Picture of a small linear actuator that I use for the elevator trim tab that is small and light weight enough to put inside the elevator.

http://www.firgelli.com/




Look at this--- https://www.firgelliauto.com/products/light-duty-rod-actuator --- Up to 200 lbs.

Or this ----https://www.firgelliauto.com/products/heavy-duty-track-actuator ------ Up to 400 lbs.
 

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TFF

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Mooney added an electric motor to the hand lever gearbox. If you are wanting RC like electric gear, you will have to make it.
 

Vector

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I was thinking about this last night. Don't want to highjack the post but should one consider 3 independent system tied together by an electrical switch or 2 systems(nose and mains). Thoughts?
 

cluttonfred

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Why not one system with mechanical interlock between mains and nosegear, much like powered version of the Mooney manual system? I don't know if the powered Mooneys work the same way. I am sure that there would be a weight penalty but you'd be much less likely to have a partial retraction or extension--either they all come up or they all go down. Of course, if you put the nosewheel on the tail where it belongs, you can just leave it down.
 

Vector

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Why not one system with mechanical interlock between mains and nosegear, much like powered version of the Mooney manual system? I don't know if the powered Mooneys work the same way. I am sure that there would be a weight penalty but you'd be much less likely to have a partial retraction or extension--either they all come up or they all go down. Of course, if you put the nosewheel on the tail where it belongs, you can just leave it down.
Seems to me like you would need a well designed combination of actuating rods and or cables to make it all work. You are also now using up a lot of space in the belly(below floor board) for this to work. Maybe a well thought out design is out there. I am not familiar with the Mooney setup.
 

TFF

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Mooney uses push pull rods. Way too complicated and I like Mooneys. The manual and electric gearbox is generally the same. Johnson bar Mooneys pretty much wind the gears with one stroke instead of an electric motor. Electric would be nice but actuators would need to be built. Off the shelf hydraulic cylinders would be easier.
 
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