Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Page 1 of 2 12 LastLast
Results 1 to 25 of 33

  1. #1

    Join Date
    Jun 2004
    Location
    ReutIsrael, ISRAEL
    Posts
    3,097
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    Hello guys,

    im building an Xtreme Jets F-18C kit. the elevators come with what appears to be an aluminum shaft, and the bushings inside the fuse for this shaft to rotate in are brass.
    Stock bushings hav the ID a bit too big, creating slop in the entire elevator, and i would like to fix this.

    How would you guys recommend fixing this matter ? the difference between OD of the rod and ID of the bushings is small, so an adapter tube is out of the question.

    please express your thoughts.
    thanks.
    www.liorzahavi.com
    www.youtube.com/i3dm

  2. #2

    Join Date
    Nov 2007
    Location
    Sunrise, FL
    Posts
    162
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    Mine had no slop. Ask them for replacements.

  3. #3

    Join Date
    Jun 2004
    Location
    ReutIsrael, ISRAEL
    Posts
    3,097
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    its an old kit. i dont think its valid for anything but ill try.

    would still love to fix it myself.
    www.liorzahavi.com
    www.youtube.com/i3dm

  4. #4
    Jim Cattanach's Avatar
    Join Date
    Mar 2003
    Location
    Larnaca, , CYPRUS
    Posts
    2,024
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    If you can get the bushings out, & know someone with a lathe, you could get new ones made quite easily.
    JET FLYING:- Resistance is futile. You will be assimilated.

  5. #5

    Join Date
    Jun 2004
    Location
    ReutIsrael, ISRAEL
    Posts
    3,097
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods


    ORIGINAL: Jim Cattanach

    If you can get the bushings out, & know someone with a lathe, you could get new ones made quite easily.
    thats one option i thought of. perhaps make new bushings out of Delrin and not brass ?
    www.liorzahavi.com
    www.youtube.com/i3dm

  6. #6
    Meesh's Avatar
    Join Date
    Jan 2003
    Location
    Dracut, MA
    Posts
    2,743
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    Black Delrin is an excellent bearing material for this type of application.

    Bob
    If it\'\'s worth doing, it\'\'s worth doing it right.
    AMA 779352, JPO 1965, IMAA 40337

  7. #7

    Join Date
    Jan 2002
    Location
    Central Valley, CA
    Posts
    703
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    It appears that you have the 1st generation system for the flying stab. Although they do work they were inherently weak. Even if you improve the brass bushing size/fit you will still have a lot of servo to control surface slop due to a very flimsy wooden servo mount on those first generation kits. The later versions of that aircraft came with a combination ball bearing supported stab receiver and aluminum servo mount that was far superior in strength and eliminated the geometry slop completely. I suggest contacting the factory to purchase the upgraded stab units. I had a friend that did this and the conversion was not difficult and the results were fabulous. The other major modification I highly suggest is tieing in the former that is most rear the main hatch to the top of the fuse and the vertical stabs(in the early versions this former only contacts the bottom and sides of the inner fuselage and not the top). Otherwise the vertical stabs will be very flimsy at the root where they connect to the fuselage.

  8. #8

    Join Date
    Oct 2003
    Location
    Sydney, AUSTRALIA
    Posts
    30
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    I had the same issue when I built my Skymaster F/A-18C back in 2006 (I think it was purchased in 2003).

    I ended up replacing the Skymaster elevators with aluminium servo arm units and elevators from JetLegend.

    Please see the following link for details=> http://www.rcuniverse.com/forum/m_48...tm.htm#4824046

    It took some effort, but it was worth it. I don’t have any slop in the elevators and the model aircraft is still being flown at our major jet meets.

    Regards,
    George
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Qn38459.jpg 
Views:	29 
Size:	21.9 KB 
ID:	1839161  

  9. #9

    Join Date
    Jun 2004
    Location
    ReutIsrael, ISRAEL
    Posts
    3,097
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods


    ORIGINAL: HotelSierra

    It appears that you have the 1st generation system for the flying stab. Although they do work they were inherently weak. Even if you improve the brass bushing size/fit you will still have a lot of servo to control surface slop due to a very flimsy wooden servo mount on those first generation kits. The later versions of that aircraft came with a combination ball bearing supported stab receiver and aluminum servo mount that was far superior in strength and eliminated the geometry slop completely. I suggest contacting the factory to purchase the upgraded stab units. I had a friend that did this and the conversion was not difficult and the results were fabulous. The other major modification I highly suggest is tieing in the former that is most rear the main hatch to the top of the fuse and the vertical stabs(in the early versions this former only contacts the bottom and sides of the inner fuselage and not the top). Otherwise the vertical stabs will be very flimsy at the root where they connect to the fuselage.
    can you please explain which former exactly ?
    www.liorzahavi.com
    www.youtube.com/i3dm

  10. #10

    Join Date
    Jun 2004
    Location
    ReutIsrael, ISRAEL
    Posts
    3,097
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    I have also contacted John to ask for current replacement parts.
    does anyone have pics of the aluminum / ball bearing mechnism used on this model today ?
    www.liorzahavi.com
    www.youtube.com/i3dm

  11. #11
    erbroens's Avatar
    Join Date
    Nov 2003
    Location
    Curitiba, Parana, BRAZIL
    Posts
    3,874
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    Hi Lior, some time ago I learned in RCU about using some thin CA in the stab pivot, (with the stab removed, of course) to get rid of the slop. It worked great in my old version SM F-18 wich I think is the same of yours.


    Enrique

  12. #12

    Join Date
    Dec 2002
    Location
    PERTH, AUSTRALIA
    Posts
    1,035
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    The guys have covered it well above with their comments. I did a similar thing on mine when I built it 6 years ago. I will take some pics tonight and post for you to see.

  13. #13

    Join Date
    Jun 2004
    Location
    ReutIsrael, ISRAEL
    Posts
    3,097
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods


    ORIGINAL: erbroens

    Hi Lior, some time ago I learned in RCU about using some thin CA in the stab pivot, (with the stab removed, of course) to get rid of the slop. It worked great in my old version SM F-18 wich I think is the same of yours.


    Enrique
    we tried that but it doesnt seem to adhere to the aluminum very well.

    John has already agreed to supply updated parts (aluminum mount + bearings) so i think this is probably the best solution.
    www.liorzahavi.com
    www.youtube.com/i3dm

  14. #14

    Join Date
    Jun 2004
    Location
    ReutIsrael, ISRAEL
    Posts
    3,097
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods


    ORIGINAL: Craig B.

    The guys have covered it well above with their comments. I did a similar thing on mine when I built it 6 years ago. I will take some pics tonight and post for you to see.
    with which mechnism ?
    www.liorzahavi.com
    www.youtube.com/i3dm

  15. #15

    Join Date
    Dec 2002
    Location
    PERTH, AUSTRALIA
    Posts
    1,035
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    Hi Lior,

    With the original mechanism supplied with the kit. Will get photos up for you in the next couple of hours. Check those elevator mounts very carefully! I pulled mine out with 2 fingers!! and then re-glued them and reinforced them as they ply wood was prone to flex and distort allowing for more elevator slop.

    Regards,

    Craig.

  16. #16

    Join Date
    Jun 2004
    Location
    ReutIsrael, ISRAEL
    Posts
    3,097
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods


    ORIGINAL: Craig B.

    Hi Lior,

    With the original mechanism supplied with the kit. Will get photos up for you in the next couple of hours. Check those elevator mounts very carefully! I pulled mine out with 2 fingers!! and then re-glued them and reinforced them as they ply wood was prone to flex and distort allowing for more elevator slop.

    Regards,

    Craig.
    OK, im waiting for those pictures.
    www.liorzahavi.com
    www.youtube.com/i3dm

  17. #17

    Join Date
    Jun 2004
    Location
    ReutIsrael, ISRAEL
    Posts
    3,097
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    This is the only picture i got from John so far.

    and he is asking for 68$ for EMS shipping (Yikes!) [X(]
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Lj21482.jpg 
Views:	28 
Size:	192.3 KB 
ID:	1839423  
    www.liorzahavi.com
    www.youtube.com/i3dm

  18. #18

    Join Date
    Oct 2003
    Location
    Sydney, AUSTRALIA
    Posts
    30
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    The servo mount units available from JetLegend have ball bearings fitted on both sides of the control arm to firmly support the elevator.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Zx70473.jpg 
Views:	42 
Size:	98.8 KB 
ID:	1839429  

  19. #19

    Join Date
    Mar 2002
    Location
    Kaohsiung, TAIWAN
    Posts
    1,646
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    ORIGINAL: i3dm

    This is the only picture i got from John so far.

    and he is asking for 68$ for EMS shipping (Yikes!) [X(]
    Hi,

    i think send the bearings with mounts by EMS is little expensive, I suggest by air mail the shipping is Free, i will send these parts to you from Taiwan by airmail, but the delivery time is a month ,

    Best Regards

    Anton
    owner - Skymaster Jet
    X-Treme Jets

  20. #20

    Join Date
    Mar 2005
    Location
    -, CHINA
    Posts
    58
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods


    ORIGINAL: i3dm

    This is the only picture i got from John so far.

    and he is asking for 68$ for EMS shipping (Yikes!) [X(]
    Hi Lior

    You asked to send the wooden former also inside the package.The freight includes those former also.One note is ISRAEL is the most expensive shipping destination even by EMS here.The relatively cheaper shipping is by airmail and shipping can be free for you if you don't mind the arrival time.

    Best regards

    John

  21. #21

    Join Date
    Jun 2004
    Location
    ReutIsrael, ISRAEL
    Posts
    3,097
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    ORIGINAL: johnzqh


    ORIGINAL: i3dm

    This is the only picture i got from John so far.

    and he is asking for 68$ for EMS shipping (Yikes!) [X(]
    Hi Lior

    You asked to send the wooden former also inside the package.The freight includes those former also.One note is ISRAEL is the most expensive shipping destination even by EMS here.The relatively cheaper shipping is by airmail and shipping can be free for you if you don't mind the arrival time.

    Best regards

    John

    Thank you John! that is a great offer - airmail is fine as long as it is registered with a tracking number.
    but can you please post a pic of everything that is included (aluminum mounts, wooden former, bearings etc) ?

    also can you confirm that the pivot shaft in the old model's elevators matches the bearings ?
    www.liorzahavi.com
    www.youtube.com/i3dm

  22. #22

    Join Date
    Dec 2002
    Location
    PERTH, AUSTRALIA
    Posts
    1,035
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    Here you go Lior.....no matter what you need to stiffen up the plywood servo mount with some other woodwork. When I rigged up the servo, gave full up elevator and pushed the stab back the whole plywood support twisted allowing moe slop. These extra supports fixed the problem for me.....

    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Hf99538.jpg 
Views:	36 
Size:	78.2 KB 
ID:	1839524   Click image for larger version. 

Name:	Rl24628.jpg 
Views:	36 
Size:	96.3 KB 
ID:	1839525   Click image for larger version. 

Name:	Ac63684.jpg 
Views:	38 
Size:	131.3 KB 
ID:	1839526  

  23. #23

    Join Date
    Jun 2004
    Location
    ReutIsrael, ISRAEL
    Posts
    3,097
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods


    ORIGINAL: Craig B.

    Here you go Lior.....no matter what you need to stiffen up the plywood servo mount with some other woodwork. When I rigged up the servo, gave full up elevator and pushed the stab back the whole plywood support twisted allowing moe slop. These extra supports fixed the problem for me.....

    Did you still use the bushings on the pivot shaft, or changed to ball bearings ?
    www.liorzahavi.com
    www.youtube.com/i3dm

  24. #24

    Join Date
    Dec 2002
    Location
    PERTH, AUSTRALIA
    Posts
    1,035
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    I only used the original bushing and the original hardware Lior , BUT, I also lengthen then control horns used on all of my SKYMASTER jets. I make new horns out of 3mm aluminium that I bolt to the stock control arms. This allows me to lengthen the arms to the point that I almost double the length of the control arm and that goes a long way to reducing the slop in the system.

  25. #25

    Join Date
    Dec 2002
    Location
    PERTH, AUSTRALIA
    Posts
    1,035
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Removing slop in Skymaster / Xtreme Jets F-18C elevator rods

    Here is a pic of one such control horn extension...note that I added a locking nut on the ball link bolt after photo was taken...this was just a progress shot.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Ax73002.jpg 
Views:	39 
Size:	78.6 KB 
ID:	1839790  


Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 12:47 PM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.