Electromechanical Landing Gear Actuators

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by cblink.007, Feb 28, 2017.

Help Support HomeBuiltAirplanes Forum by donating:

  1. Feb 28, 2017 #1

    cblink.007

    cblink.007

    cblink.007

    Active Member

    Joined:
    Jul 7, 2014
    Messages:
    27
    Likes Received:
    10
    Location:
    Tennessee, USA
    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
     
  2. Feb 28, 2017 #2

    Victor Bravo

    Victor Bravo

    Victor Bravo

    Well-Known Member

    Joined:
    Jul 30, 2014
    Messages:
    6,203
    Likes Received:
    4,985
    Location:
    KWHP, Los Angeles CA, USA
    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.
     
    BoKu likes this.
  3. Feb 28, 2017 #3

    BJC

    BJC

    BJC

    Well-Known Member HBA Supporter

    Joined:
    Oct 7, 2013
    Messages:
    9,685
    Likes Received:
    6,478
    Location:
    97FL, Florida, USA
    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
     
    BoKu likes this.
  4. Mar 1, 2017 #4

    Pops

    Pops

    Pops

    Well-Known Member

    Joined:
    Jan 1, 2013
    Messages:
    7,208
    Likes Received:
    6,105
    Location:
    USA.
    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.
     

    Attached Files:

    Last edited: Mar 1, 2017
    mcrae0104, Victor Bravo and BoKu like this.
  5. Mar 1, 2017 #5

    TFF

    TFF

    TFF

    Well-Known Member

    Joined:
    Apr 28, 2010
    Messages:
    11,706
    Likes Received:
    3,314
    Location:
    Memphis, TN
    Mooney added an electric motor to the hand lever gearbox. If you are wanting RC like electric gear, you will have to make it.
     
  6. Mar 1, 2017 #6

    Vector

    Vector

    Vector

    Well-Known Member

    Joined:
    Dec 5, 2010
    Messages:
    343
    Likes Received:
    12
    Location:
    Pacific
    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?
     
  7. Mar 1, 2017 #7

    cluttonfred

    cluttonfred

    cluttonfred

    Well-Known Member

    Joined:
    Feb 13, 2010
    Messages:
    6,429
    Likes Received:
    2,279
    Location:
    World traveler
    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.
     
  8. Mar 1, 2017 #8

    Vector

    Vector

    Vector

    Well-Known Member

    Joined:
    Dec 5, 2010
    Messages:
    343
    Likes Received:
    12
    Location:
    Pacific
    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.
     
  9. Mar 1, 2017 #9

    TFF

    TFF

    TFF

    Well-Known Member

    Joined:
    Apr 28, 2010
    Messages:
    11,706
    Likes Received:
    3,314
    Location:
    Memphis, TN
    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.
     
  10. Mar 3, 2017 #10

    Twodeaddogs

    Twodeaddogs

    Twodeaddogs

    Well-Known Member HBA Supporter

    Joined:
    Jan 18, 2009
    Messages:
    829
    Likes Received:
    234
    Location:
    Dunlavin, County Wicklow,Ireland
    Look at the BEDE 5 spring loaded system.
     
    BJC likes this.

Share This Page



arrow_white