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Thread: Olibuilt 's New Cub project

  1. #521
    BC12D-4-85's Avatar
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    More flap about flaps and ailerons:

    See page 27 on for a discussion: https://ntrs.nasa.gov/archive/nasa/c...9930091708.pdf

    https://generalaviationnews.com/2015/04/21/cubcrafters-introduces-carbon-cub-ex-2/

    http://cubcrafters.com/c/2017/02/g-s...ailerons-faqs/

    Note the cove gap tapering to the outlet and hinge line.

    Gary
    Last edited by BC12D-4-85; 06-19-2019 at 12:08 AM.
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  2. #522
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    Quote Originally Posted by BC12D-4-85 View Post
    One enigma though is we tend to slot flaps and seal ailerons. That may be simply due to the cove design in front of each. Citabrias are like that for their ailerons and partially sealed flaps. Unless it flows well to help then a seal simply reduces any loss of pressure air from below or above and makes the control more effective (like the aileron).
    Gary
    Gary, I learned to fly in a 7AC and do like the entire series of models, however their controls are sloppy at low speeds. The current manufacturer has an optional spade which is supposed to correct the aileron's sloppiness. It is only a band aid. The airplane does pass all certification requirements, however...........................

    We can discuss this in depth if you wish but let's do it on another thread than Oli's.
    N1PA
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  3. #523

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    I started a new thread here so the discussion of slots and seals can develop further.
    https://www.supercub.org/forum/showt...lots-and-seals
    Not sure my link is right.
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  4. #524

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    Quote Originally Posted by CharlieN View Post
    I started a new thread here so the discussion of slots and seals can develop further.
    https://www.supercub.org/forum/showt...lots-and-seals
    Not sure my link is right.
    It works here on my end.

  5. #525
    skywagon8a's Avatar
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    Quote Originally Posted by Olibuilt View Post
    Had the time to do a little flight test today. It still fly, that is the good thing.. Hahah ...

    First impressions may be wrong:

    -less tail shake a 45mph, with 45 flaps
    -less sink rate at 45mph with 45 flaps

    Did only one landing. Will report feedback when I have the chance to test it more.
    Oli, How is this working out for you? Can you give us a report on how well the improvements worked or did not, please?
    N1PA
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  6. #526

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    45* flaps at 45mph? Why?

    Total flap deflection is an interesting topic. When I started building my plane we wanted 70*. That was problematic and as it turns out, unnecessary. These days it’s 50*. I don’t know where BCSC is with the Rev 3 flap but initially they were targeting 30*.
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  7. #527
    skywagon8a's Avatar
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    My TCOW 110" long and otherwise stock Piper flaps go to 56 degrees. There is no tail shake and only minor pitch up nearing max deflection.
    N1PA

  8. #528
    Olibuilt's Avatar
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    Quote Originally Posted by skywagon8a View Post
    Oli, How is this working out for you? Can you give us a report on how well the improvements worked or did not, please?
    I realize I cannot say those gap seals makes a big difference. No extensive test were done...
    Don't forget it is also the first BushWheels season with the 3"x3" extended elevators too..
    And my skills are always improving

    The thing is I've changed the way I handle the plane:
    -I now only use flaps at 45*, instead of 65*. The plane appear to be able to fly slower at 45*
    -I now feel comfortable at around 30mph IAS (smooth air)
    -I'm now confident on my skills to handle water assisted landing.


    I know that when you think you are in total control, it can bite. But I really feel I can handle that plane...



    Last edited by Olibuilt; 08-05-2019 at 04:17 PM.
    http://photos.app.goo.gl/wfcHQyxEdfTa6AuC9
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  9. #529
    Olibuilt's Avatar
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    Airplane is going strong, I really love it.
    86" Catto prop pulls very hard, but I sometime wich a little more cruise speed....

    A short video of my latest flying:



    Hope you like

  10. #530
    Olibuilt's Avatar
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    New suspension fairings. Hoping for supersonic speed, nothing less...

    Click image for larger version. 

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  11. #531

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    That hatchet is gonna cost you at least 5 knots...

  12. #532

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    Fairing the long shock struts could get tricky, probably why you haven't, yet?!I think I have the only faired cabane I've seen on Cub style gear, beside the shock struts and A frames, all with trailing edge taper, not just covered. If it's round, I want to fair it, don't care about speed so much but it helps climb and range also.

  13. #533
    skywagon8a's Avatar
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    Quote Originally Posted by Olibuilt View Post
    New suspension fairings. Hoping for supersonic speed, nothing less...
    If you look at a stock PA-18 with the metal speed fairings over the shock cords after landing, you will see that they are not in line with the center line of the plane. They reflect the twisting of the airflow from the propeller rotation. While yours may appear to have streamlined the airflow, any advantage may actually be counteracted by the corkscrew flow from the prop.
    Did you notice any difference in your speed? Aerodynamics is sometimes quite complicated and at other times a very small thing can make a big difference.
    N1PA

  14. #534
    Olibuilt's Avatar
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    Did only a small flight yesterday, but it looks like about 4mph speed gain.

    I will try to tape small aluminum angles to the trailing edge of the shock struts.

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