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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
    skywagon8a's Avatar
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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
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  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.

  15. #535
    Olibuilt's Avatar
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    Had an issue with one of my Slick magneto last fall. Sparkplugs were also due to replace. So I've decided to go with two PMags for simplicity. I've very pleased with them so far, after about 20hrs of flying time. Starting is so easy engine cold or hot, and running smoother on idle. CHT went up a little, but maybe due to may cowling rework:

    Click image for larger version. 

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    Relocation of the EarthX battery firewall forward and,
    I've also rooted the new engine breather direct into one of the exhaust. Filled with sand, the 5/8 tube was easy to bend with a standard conduit bender (thanks to this forum )



    Click image for larger version. 

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    New cowling hole for timing purposes... hahaha! :

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    Cabin heat and carb heat were also rework for less weight and simplicity, thanks to Vetterman Exhaust carb heat box.












    Cub is running better then ever!!! Very pleased.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  16. #536

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    Oli -- You still hand propping with the Pmags?
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  17. #537
    Olibuilt's Avatar
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    Quote Originally Posted by motosix View Post
    Oli -- You still hand propping with the Pmags?

    No! I've installed a starter a few years ago, a little after building the new suspension. Shock strut is in the way when trying to reach the throttle from outside. But thanks for reminding me I should practice with the PMags.

    Ring gear support was also lightened:

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    Cabin heat and carb heat were rework for less weight and simplicity, but not more cabin heat....:

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  18. #538
    Steve Pierce's Avatar
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    be sure and clean that crankcase vent at each oil change if it does like the Carbon Cubs. It will coke up and block off.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
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  19. #539
    tcraft128's Avatar
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    Oli, I dont see the cooling blast tubes for your PMAGs, make sure they are on there!

    Jay
    Turning money into noise since 1996

    Our Build here


  20. #540
    Olibuilt's Avatar
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    Quote Originally Posted by tcraft128 View Post
    Oli, I dont see the cooling blast tubes for your PMAGs, make sure they are on there!

    Jay
    They are there, thanks!

  21. #541
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by tcraft128 View Post
    Oli, I dont see the cooling blast tubes for your PMAGs, make sure they are on there!

    Jay
    I see the SCAT tube blasting it


    Sent from my iPhone using SuperCub.Org mobile app

  22. #542

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    Quote Originally Posted by stewartb View Post
    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*.
    Thanks Stewart


    Sent from my iPhone using SuperCub.Org mobile app

  23. #543

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    I'd love to hear how it props on the pmags (9volt battery method?). I have not switched over yet as I am a hand propper. I bet it work better than my dual impulses but I have never tried it...

  24. #544
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    Exhaust Crankcase Vent

    Quote Originally Posted by Steve Pierce View Post
    be sure and clean that crankcase vent at each oil change if it does like the Carbon Cubs. It will coke up and block off.


    Anybody have a picture/description of the Carbon Cub system ? Which model/year has it ?

    Thanks !

    Jonny

  25. #545
    Olibuilt's Avatar
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    Quote Originally Posted by Jonnyo View Post
    Anybody have a picture/description of the Carbon Cub system ? Which model/year has it ?

    Thanks !

    Jonny



    Check this link:

    http://cubcrafters.com/c/wp-content/...Tube_Rev_A.pdf

  26. #546
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    Quote Originally Posted by motosix View Post
    I'd love to hear how it props on the pmags (9volt battery method?). I have not switched over yet as I am a hand propper. I bet it work better than my dual impulses but I have never tried it...

    Motosix: Have you switched to Pmags and still handpropping ?


    Olibuilt: How about you. Handpropping with Pmags ?

    thanks,

    Jonny

  27. #547

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    Quote Originally Posted by Jonnyo View Post
    Motosix: Have you switched to Pmags and still handpropping ?


    Olibuilt: How about you. Handpropping with Pmags ?

    thanks,

    Jonny
    stay away from electrical stuff, automobiles and machinery have taught me that very well. constant nightmares and downtime.

  28. #548

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    Quote Originally Posted by Jonnyo View Post
    Motosix: Have you switched to Pmags and still handpropping ?


    Olibuilt: How about you. Handpropping with Pmags ?

    thanks,

    Jonny
    Not yet - I am still on dual impulse slick mags.

    The circuit required to energize the Pmag at low RPM looks easy enough and it should start just as "easy" on them, but I have not yet made the plunge. I am hopeful Oli will tell us "it starts easier on pmags" since he hand propped for a while before making the switch to having a starter & ring gear.

  29. #549
    Olibuilt's Avatar
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    A flight trip is planned for September. I need to try this 9v battery thing before going....


    Will let you know for sure.

  30. #550

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    Quote Originally Posted by Olibuilt View Post
    A flight trip is planned for September. I need to try this 9v battery thing before going....


    Will let you know for sure.
    I think it accepts a range of voltages so you could just wire into the main battery just to test. I imagine the idea behind a separate battery is that if you are hand propping, your main battery is probably dead...

  31. #551

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    Even is the main battery is considered dead, it more than likely will still supply 9 volts or so.
    Regards, Charlie
    Super Coupe E-AB build in process

  32. #552
    skywagon8a's Avatar
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    Quote Originally Posted by CharlieN View Post
    Even is the main battery is considered dead, it more than likely will still supply 9 volts or so.
    Charlie, The P-mags require an external electrical power source at all times for starting and operating at minimum rpm.
    N1PA

  33. #553
    Olibuilt's Avatar
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    Quote Originally Posted by CharlieN View Post
    Even is the main battery is considered dead, it more than likely will still supply 9 volts or so.
    My main battery is a EarthX ETX36C. I think it is the kind of battery that automatically shuts down, to prevent over discharged...

  34. #554

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    Quote Originally Posted by Olibuilt View Post
    My main battery is a EarthX ETX36C. I think it is the kind of battery that automatically shuts down, to prevent over discharged...
    Ahh, that does matter.
    Regards, Charlie
    Super Coupe E-AB build in process

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