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Thread: Olibuilt 's New Cub project

  1. #561

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    Attachment 52919







    140lbs garage door springs
    ski up - ski down
    Ski angle changes a lot!

    Attachment 52920 Attachment 52921





    This is my first time with retractable skis.
    Am I missing something??



    Thanks again![/QUOTE]

    FliLite ski angle changes very little whether up or down. On my old -12 mine were rigged flat. You're going to be wallowing in the air with wheels down.

    I'd move the aft check cable further back on the longeron.
    Last edited by stewartb; 12-11-2020 at 06:31 PM.
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  2. #562
    Olibuilt's Avatar
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    Quote Originally Posted by stewartb View Post
    FliLite ski angle changes very little whether up or down. On my old -12 mine were rigged flat. You're going to be wallowing in the air with wheels down.

    I'd move the aft check cable further back on the longeron.



    Will try to move the rear cable to the rear float fitting, first light tomorrow morning!


    Mine are with 8.00 x 6 if it maters.

    Thanks again

  3. #563
    mike mcs repair's Avatar
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    Olibuilt 's New Cub project

    Just thinking out loud.... can you. Change length f rear cable as ski goes up or down by pulling on it??? To keep angle in line? Or add a hard ski nose up stop?


    Sent from my iPhone using SuperCub.Org

  4. #564
    Olibuilt's Avatar
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    Quote Originally Posted by mike mcs repair View Post
    Just thinking out loud.... can you. Change length f rear cable as ski goes up or down by pulling on it??? To keep angle in line? Or add a hard ski nose up stop?


    Sent from my iPhone using SuperCub.Org
    I've tried to add a cable to the electric ski plate, to a ''pulley'' at the rear of the ski, to the fuselage. Too complicated I think

  5. #565
    cubdriver2's Avatar
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    Quote Originally Posted by Olibuilt View Post
    I've tried to add a cable to the electric ski plate, to a ''pulley'' at the rear of the ski, to the fuselage. Too complicated I think

    I added a spring to take up the slack


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    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"
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  6. #566
    courierguy's Avatar
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    Very interesting cubdriver. I think anyone with retracts can sympathize with Olibuilt's rigging issues! It's all a compromise, but your use of the that rear cable spring has got me thinking. I have a pretty steep ramp I have to transition out of my hangar, and it taxes the cable limits as now rigged but since it all seems to be working for the last several years I won't mess with it for now, but will keep that spring idea in mind. One clue I have is the deformed thimbles on my 1/8 cables...... and I see from some video that I could "get away" with a bit more nose down on the Datums when in flight, but that would make my ramp angle thing worse. It makes my head hurt if I think about it too hard, but it's always good to have a different viewpoint.

    My old trick that I used to rig hang gliders and ultralights, of using electrical split bolts to temp secure cables (without hurting or deforming the cable at all) was a huge help in rigging my Datums.

  7. #567

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    It is a little hard to tell from the picture because I don't think that is level flight for the plane (firewall vertical) Just from the pictures it looks like the rear check cables are to long, making the nose of the ski sit too high in flight. Could be just the picture.
    DENNY

  8. #568

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    With retractable wheel-skis, the front and rear cables should be parallel, or nearly so. Otherwise the ski will change its pitch attitude considerably.

    Move the front cable to the lower engine mount.
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  9. #569
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    Quote Originally Posted by NunavutPA-12 View Post
    With retractable wheel-skis, the front and rear cables should be parallel, or nearly so. Otherwise the ski will change its pitch attitude considerably.

    Move the front cable to the lower engine mount.
    I would have been that route But I can't! 2 exhaust pipe right bellow the engine mount bolts...






    I did try to move the rear cable to the rear float fitting. No improvement there..



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    So it will be flying ski down position.





    Now struggling with those little heavy hard tires and retractable wheel thing....

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  10. #570
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    First level the plane to cruise attitude. Your rear cables are too long.The rear cable length controls the ski position in flight. I rig everything with string/cord first before cutting cable. You can rig a cable between float fitting and rear gear fitting with a steel ring in the middle somewhere that you can attach the rear ski cable to.

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"
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  11. #571
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    Quote Originally Posted by cubdriver2 View Post
    First level the plane to cruise attitude. Your rear cables are too long.The rear cable length controls the ski position in flight.

    Glenn

    Rear cable are as short as they can be, in flight position, suspension fully extended... Ski down

    Just like the AtleeDodge drawing.

    But I did it with a smart level, assuming my firewall is perpendicular, door bottom and fuselage fitting parallel.


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    Ski down is the easy part. Ski up do change the angles, but I think I can live with that

  12. #572
    Tim's Avatar
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    I know it's no help now but when I put my skis on I can get a video of how mine are rigged and work.. you are going to need a tail wheel. Here's what I made and it's retractable
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    Sent from my Pixel 2 using SuperCub.Org mobile app

  13. #573

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    Need one of theses!

  14. #574
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    What about a sacrificial skid instead of the tail wheel?
    N1PA
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  15. #575
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    Quote Originally Posted by skywagon8a View Post
    What about a sacrificial skid instead of the tail wheel?
    I was thinking the same thing. a strip of 1/2" UHMW should do the trick. we cross roads and even drive down them on snowmobiles towing sleighs that weigh half of an entire plane and the UHMW strips on the bottom of the sleigh last's quite a while. with the little weigh on the tail of the ski while wheels are down I wouldn't have any trouble trying a wear pad, even if you had the change them twice a year the stuff is so cheap I wouldn't complain.
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  16. #576
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    Still on bushwheels, not much snow around here yet...


    I've went with retractable little and heavy wheels.

    Travel is now set to maximum, but can easily be adjusted.



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    Hope it works...

  17. #577

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    Hi Olie

    I'm a good friend of Dan Poirier, i'm buying his old Citabria wich is all apart, i'm planning to rebuild it in the experimental category with enough mods to comply
    with the 51% rules.

    I have a question for you: Did you loose any top speed with the installation of the slats on your cub? I'm looking into that for my rebuilt.

    Franky

  18. #578
    Olibuilt's Avatar
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    Quote Originally Posted by Franky View Post
    Hi Olie



    I have a question for you: Did you loose any top speed with the installation of the slats on your cub? I'm looking into that for my rebuilt.

    Franky
    Yes.

  19. #579

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    another question for Oli, is that a home made fuel belly pod? do you have another thread detailing it out of curiosity?

  20. #580
    Olibuilt's Avatar
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    Quote Originally Posted by farm_boy252 View Post
    another question for Oli, is that a home made fuel belly pod? do you have another thread detailing it out of curiosity?
    No. Only Dacron fabric and Velcro speed fairings.

    Gear leg fairings started to tear, right behind the rear gear leg tube, so I removed them for future reinforcement...


    But the belly cargo thing has help up good and very helpfull.



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  21. #581

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    Olie

    How much are you loosing on the top speed with the slats?

    Franky

  22. #582
    Olibuilt's Avatar
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    Quote Originally Posted by Franky View Post
    Olie

    How much are you loosing on the top speed with the slats?

    Franky
    Less than the Bushwheels I'd guess... 5mph?




  23. #583
    Olibuilt's Avatar
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    Fluidyne Fli-Lite 3000 skis are working good. 12" stroke, 450lbs force, IP69M Model PA-10 Electric linear actuator that I bought from progressiveautomations are doing the job so far.

    I even went to a local airport to land on bare asphalt, wheels down.... It was a first time for me on small wheels with this Cub.

    Actuators are strong enough to push the wheel plates under the wheels on flat ground.



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  24. #584
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    good deal Oli, keep us posted on the actuators if they hold up

    Sent from my Pixel 2 using SuperCub.Org mobile app

  25. #585
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    They are fairly cheap, at least the somewhat similar ones on my Datums, and I like to keep a spare just in case. I had a bit of a learning curve before I learned NOT to taxi up to a berm and then make the actuators have to haul the plane uphill in effect. Stupidly holding brake when using them is another thing I've learned to avoid! Level surface, no problem. I've tested them every way possible I think, on purpose and accidentally, and the concept in general is viable v. hydraulic retracts., good to see Oli's use of them.
    Last edited by courierguy; 01-12-2021 at 11:01 AM.

  26. #586
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    Datum actuators are $500 each, American, at least for the 2000’s. Progressive Automations PA-10 that Oli bought are $179. The PA-17, rated at 800 lbs is $305. The PA’s can be retrofitted easily to Datums with a ruler and a Tig welder and you don’t have to deal with Jean Marc

  27. #587
    courierguy's Avatar
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    Yes, source them yourself and modify if necessary, works for me also. I don't have a problem with Jean at all, it's the frigging border BS I don't like.

  28. #588

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    Quote Originally Posted by Olibuilt View Post
    Decide to go with the same brake setup of my white cub. They work perfectly with double puck calipers and 35''. Strong enough to lock the wheels but weak enough to land with the brakes on for short landings.

    Wagaero homebuilt brake pedal and master kit. Speed holes to save more than half a pound....


    Attachment 5484


    They fit right over the brake reinforcing channel.

    Attachment 5485
    Just a heads up for Oli (and everyone else enthralled with this build thread):

    I took your lead and started converting my brake system over so this exact kit. Wag Aero is still producing the mounting brackets, however they no longer have any stock of the pedals they used for decades. I was able to purchase the last right pedal to use as inspiration to start drawing my own system. This is just a heads up for anyone in the future who goes down this road (like I did).

    Wag Kit like yours:

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    New pedal design:

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    I incorporated a parking brake right into the base bracket so I don't need an external bar to maintain pressure on the pedals:

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    CNC'd ready for master cylinder installation (and 3D print used during test fitment):

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    This thread and your creativity has given me so many ideas for my own build. I really appreciate you continuing to post up all of your fabrications.
    Last edited by Colorado-Cub; 02-03-2021 at 11:47 AM. Reason: Pictures were invisible
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  29. #589
    Olibuilt's Avatar
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    Would love to see your work but pictures don't show for me.

  30. #590

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    Quote Originally Posted by Olibuilt View Post
    Would love to see your work but pictures don't show for me.
    The damn photo upload widget on this site always fights me. Hopefully I fixed it so they are visible now?

  31. #591
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    Quote Originally Posted by motosix View Post
    The damn photo upload widget on this site always fights me. Hopefully I fixed it so they are visible now?
    Yes! Thanks.
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  32. #592

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    Quote Originally Posted by motosix View Post

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    These are front seat?

  33. #593

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    Quote Originally Posted by gahi View Post
    These are front seat?
    Yes.

    Oli had the original idea which sparked me to rethink (then sh!tcan) my entire existing setup in favor of something much simpler and lighter. Of course, we are experimental so we can make these changes. My new front floorboard is a work in progress, but will be close to this:

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  34. #594

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    Very Nice!

  35. #595
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    Retractable skis are working perfectly. They make concrete hangar floor to snow operations easy and friendly. Yes they are heavy, but I cannot feel the added weight. In fact, longer and wider than my previous skis, I feel they float more.

    Actuators are strong enough to ''push the ski plate'' under the tire on hard and flat ground. Have not yet tried to lift the plane with it....




  36. #596

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    Last edited by NunavutPA-12; 02-12-2021 at 10:35 PM. Reason: Better photo
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