Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. #1
    25+ Posting Member


    wody's Avatar
    Join Date
    Oct 2008
    Location
    near MUNICH
    Posts
    51
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Double Yoke for C172 Pit

    Hello,

    I was searching a lot for a good sturdy solution to have a dual yoke in my planned double seater C172 pit. Has anybody made such a construction?

    I tend do have a box behind the MIP running on rails for the pitch axis. In this movable box is a linkage for the 2 yokes onm a common roll axis. Springs, dampers and potentiometers to be added accordingly.

    Is this a good approach?

    BTW: what are the movements of the yoke? I heared about 90 mm for and 90mm back. The roll is 180°. Is that right? What is the distance between both yokes?

    Thanks for any help/advise!

    Peter

  2. #2
    150+ Forum Groupie
    Join Date
    Feb 2007
    Location
    Argentina
    Posts
    204
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Double Yoke for C172 Pit

    Peter:

    80 mm for and 80 mm back (last week measurements from a real C-172). and a little more than 180š, maybe 200š, but 180 is a good approach.
    In my pit, the distance between yokes are 482,42 mm.
    Anyway, ever exist a little diference between measurements of same model of plane.

    Some dimensions graphics (not mine)



    Your approach (the box) is good, and i can add another. (look the link below)

    http://b58.svglobe.com/controls.html

    But, if you want to add a trim system, look this photos and study.



    Regards.
    Horacio.
    Attached Images Attached Images

  3. #3
    25+ Posting Member


    wody's Avatar
    Join Date
    Oct 2008
    Location
    near MUNICH
    Posts
    51
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Double Yoke for C172 Pit

    Horacio,

    many thanks for all this information!

    The link to the Baron is perfect. Good idea. Looks like I will do it that way.

    I did not think about electric trim yet, but is worth to consider. The problem is always with trimm after switching off the AP. Will think about.

    Thanks also for the cockpit dimensions from B. McMullon. I had them already, but.....
    the dimensions in length I could not find anywhere, like Angle of window, distance to the MIP, distance yoke to MIP, location of the doors, ....
    A similar drawing with a crosssection over the length of the cockpit would be great. Unfortunately I have no access to areal C172, I would have measured already. Accuracy to the mm is not necessary.

    Thanks a lot,
    Peter

  4. #4
    150+ Forum Groupie
    Join Date
    Feb 2007
    Location
    Argentina
    Posts
    204
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Double Yoke for C172 Pit

    Peter:
    Maybe this can help...
    You can use a drawing program to scale an measure angles, etc... all real C-172 drawings.
    The second and third images are captured from Pilotīs Operating Handbook. If you need more resolution, i can send you the originals PDF files.

    Distance between yokes: 476,42 mm or 482,42 mm (different MIP)
    Minimal distance between yoke and MIP : 155 mm (see drawing)




    and some other drawings to compare:


    About the trim system, what sim and hardware are you using?
    With an encoder, and FSUIPC registered, you can do a motorized trim without problems with the autopilot.

    Regards.
    Horacio.
    Attached Images Attached Images

  5. #5
    300+ Forum Addict
    Join Date
    Apr 2008
    Location
    Graham, WA
    Posts
    323
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Double Yoke for C172 Pit

    You might be better served in replicating the "Y" yoke in the real aircraft. That's how the two flight control yokes are linked. There's a gent on this forum that's building a sim from a 172 cockpit section that is re-using the original flight control hardware exactly this way. g.

  6. #6
    25+ Posting Member


    wody's Avatar
    Join Date
    Oct 2008
    Location
    near MUNICH
    Posts
    51
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Double Yoke for C172 Pit

    Thankks for the hint. I considered this already when I saw a picture of the 172 front without engine. Should be easier to build. It would be a quieter solution also.

    Still dual rudder are open. Do you have any suggestion?

    Thanks,
    Peter

  7. #7
    150+ Forum Groupie
    Join Date
    Feb 2007
    Location
    Argentina
    Posts
    204
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Double Yoke for C172 Pit

    The "U" system.
    Attached Images Attached Images

  8. Thanks Zlatko thanked for this post
  9. #8
    25+ Posting Member
    Join Date
    Jun 2015
    Location
    BG and UK
    Posts
    51
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Double Yoke for C172 Pit

    For the dual rudder please take a look at the following pictures :



    The rope in the middle drives the pulley for the actual rudder surface ( in our case it could be a potentiometer ). Two parts going under floor drive nose wheel steering mechanism.
    And i can't really find out how differential brake cylinders are actuated , if you find that out , please let me know, to preserve me some headache.
    Attached Images Attached Images

  10. #9
    150+ Forum Groupie
    Join Date
    Feb 2007
    Location
    Argentina
    Posts
    204
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Double Yoke for C172 Pit

    Zlatko:

    For the differential brake cylinders, you can see the next image and you can understand how itīs work....

    Regards.
    Horacio.
    Attached Images Attached Images

  11. #10
    25+ Posting Member
    Join Date
    Jun 2015
    Location
    BG and UK
    Posts
    51
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Double Yoke for C172 Pit

    Thank You , Horacio. You are the best. The pictures you provided undoubtedly confirmed my suspicion -there is an inner shaft within the outer tube , moved when the upper part of the pedal is pressed.
    Still i can't figure it out though, how that movement is passed on the cylinders - are the cylinders hidden behind those green brackets from the picture above or they are in some way linked to the inner shaft. One more time - thank you for your good heart to share knowledge and for your patience.
    Best Regards
    Zlatko

Page 1 of 2 12 LastLast