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Thread: supercub cad-3d

  1. #1

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    supercub cad-3d

    Hello, my name is Osvaldo, I'm a designer and my hobby is to design planes. I'm on a new project that is pa-18, the plans I got on the site supercubproject
    When analyzing the drawings, he decides to start with the wing because he thinks it is the most difficult part, and because I suspect there are parts of the drawing that is missing, as I am not a specialist in pipercubs, I am a bit wrapped up in the wing variations that this plane has in Great variety of ribs, I will put photos so you can help me and guide me. At the end of the project I will make the complete drawing available for download for everyone.1.png2.png3.png4.png5.png6.png
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    Looks good. Keep at it, there are lots of parts. I'm anxious to see the completed project.

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    www.SkupTech.com mike mcs repair's Avatar
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    BTW... the actual APPROVED ribs made by the different manufactures are all DIFFERENT shapes & sizes than the drawings, and each others parts...

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    skywagon8a's Avatar
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    Quote Originally Posted by osvaldosurf View Post
    Study this one. You have an elevation shift where you don't want it.
    N1PA
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    I'm redoing the wing from the beginning. During the works I noticed that the wing has a twist in its length, very little to be seen by inattentive eyes, this twist is applied in the spars, the rear19.png20.png21.png22.png23.png24.png spar has a positive dihedral that the front spar, can anyone confirm me?
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    skywagon8a's Avatar
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    N1PA
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    40.png43.pngengine mount piper original e dynafocal engine mount
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    40.png43.png



    Text came out backwards. Original is on left, Dyn on right.
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    Really this is the most difficult project I have ever done.44.png45.png46.png47.png
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    skywagon8a's Avatar
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    You are doing a great job. I bought my first computer about 25 years ago with the idea of making airplane parts drawings with it. I've tried several CAD type programs and have never been satisfied with the results. You have my admiration. Keep it up.
    N1PA
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    Don't know how exact you are trying to make this but one small trap is that the drag strut holes along the front and rear spar change very slightly along the spar length. Concerning the rear spar: The first inboard one is at 2 1/2 inches from the spar bottom. The second has no dimension but at at 80 13/16 out the hole center is at 2 15/16 from the spar bottom. The final hole on the diagram at the tip says 2 9/32. The drag struts are installed level so the gradually lowering holes along the rear spar have the effect of raising the outboard end of the rear spar a little over 3/16 or actual 7/32. Just the opposite happens with the front spar as the inboard hole is 1 29/32 and the most outboard hole is 2 5/16! If you were to make all the drag struts level with each other and viewed the spars from the wing front (winding stick style) the spars would form and "X" with 3/8"height difference at each end or a total of 3/4" difference if you raised the outboard end of the rear spar to make the front spar level. OR at least that's my take on it. I'm not sure anyone else has described it that way so maybe you will get some other comments. Apparently the original designers wanted the drag struts "in Plane" and the rest of the wing spars and ribs and all other parts could rotate around the drag struts as needed so the whole thing is kind of "wonky".

    One thing as you look at the wing drawings remember the drawings are for two different airplanes so the inboard spar edges they show are extended "in" a few inches for the J3 cub wing. You have to refer to the notes (see figure 5 on the front spar drawing) and then adjust your dimensions for the Supercub wing. Welcome to the world of 40's Pipers!
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    I understand very little of English, so it's a bit complicated to understand and communicate, but I understood a little what you wanted to say, at least I think!
    The pa-18 piper is my sixth aircraft that I build in solidworks and the pa-18 is the second aircraft I see with this kind of twist on the wing, the first was the cri cry drawn by frances michel colombam, the wing was born with a Angle of incidence and the wing tip has a negative incidence angle to compensate for twisting during flight. And this is in the drawings in a very subtle way, I started to do the wing and when it is close to finish I started to notice that there was something strange that is not in my plans, then I came back and did all the work again being with now with the twist and It worked!
    This aircraft is without a doubt the most difficult aircraft I ever made !!!
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    I think all type accepted aircraft have the "twist" and some dihedral. The twist is to cause the wing tips to stall last (lower angle of attack than the rest of the wing) thereby giving some aileron control even after the rest of the wing has stalled. The dihedral (spelling?) makes the aircraft more stable in the roll axis.

    Sorry about the language barrier but I am not good at communicating even with someone who speaks English.

    I wish someone else with more knowledge would post about the relationship between the drag struts and the spars. I think I have it right in the above post but I am not sure? Because I believe Piper meant for the drags struts to all be level with each other for maximum strength when the drag wires are tightened I believe the wings should have a 3/4 inch block under the rear spar as they are assembled but some believe the rear should be elevated at the tip 1 1/2 inch. One thing for sure if when the wing is mounted if anything you want to much twist so you can "pull" it down with the rear strut (strut in tension). You don't want to be pushing (compression) with the rear strut to put more twist in!
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    Quote Originally Posted by qsmx440 View Post
    I think all type accepted aircraft have the "twist" and some dihedral. The twist is to cause the wing tips to stall last (lower angle of attack than the rest of the wing) thereby giving some aileron control even after the rest of the wing has stalled. The dihedral (spelling?) makes the aircraft more stable in the roll axis.
    This is actually called wash-out. Dihedral is an entirely different thing, altogether.

    But other than that, I think everything else in the part I quoted is correct. The rest of your post: sorry, but I have no idea!
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    Quote Originally Posted by CamTom12 View Post
    This is actually called wash-out. Dihedral is an entirely different thing, altogether.

    But other than that, I think everything else in the part I quoted is correct. The rest of your post: sorry, but I have no idea!
    qsmx440,

    I re-read what you had written - I'm sorry! You correctly described dihedral, I just missed it.

    Sometimes, with some designs, actual dihedral is not required. There are some designs that have a "dihedral effect" without requiring the wings to be angled upward.

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    Hi guys.
    I need photos of this piece being built and installed on the wing.
    65.png

  22. #22

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    After a lot of work, I got it.66.png67.png
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    I would be very interested in a layout plot for a usa35b airfoil. I'd like to incorporate a cessna flap track into the trailing edge of that airfoil and cnc plasma or waterjet it out of 1/4" aluminum plate. http://www.supercub.org/forum/archiv...p/t-47805.html
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    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by eskimo77 View Post
    I would be very interested in a layout plot for a usa35b airfoil. I'd like to incorporate a cessna flap track into the trailing edge of that airfoil and cnc plasma or waterjet it out of 1/4" aluminum plate. http://www.supercub.org/forum/archiv...p/t-47805.html
    plywood pattern and wood router it? spiral cut pattern bit.... i hear thats how the one guy around here makes new flap tracks....

  25. #25

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    Amazing work! I have been playing with solid works for a little while. I still like AutoCAD 2000-it is what I'm use to. You are doing amazing work. I'd like to have a copy of your CRI CRI that is a neat little plane.


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    The cri-cri is available for download on grabcad, search for CRI-CRI COMPLETE!!

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    Incredible job, thank you to share it!

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    Quote Originally Posted by osvaldosurf View Post
    Was this project removed from GrabCad? I'd love to see the assembly so I can better understand how a wing goes together part by part...
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    appeared a person interested in financing the rest of the project. unfortunately I had to withdraw it, but in the future when I finish the whole plane I will sell it for 50 dollars. unfortunately the money speaks louder.

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    Are you planning on doing the fuselage as well?

    Being able to visualize the thing in 3D really helps me understand the plans, so I would happily pay for STL/STEPs for parts in the whole assembly when complete.

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    Okay, I'll start doing it, when I finish notice here in the forum.

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    I came back

    https://osvaldoprojetos.blogspot.com.br/
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    Pa-18

    I am following strictly the plans, but still some doubt is in some points, but I will correct in the course of the project, the good thing to do the projects first in cad 3d, and here you can go wrong and more ahead correct without problems, but in real life the problem is much bigger, my doubts may be too many, this will be good for those who one day wish to build a pa 18
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  35. #35

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    Pa-18

    This is a summary of yesterday's work, today will have little work on the project.
    I will try to summarize the amount of photos so as not to congestion the forum with many photos.
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  36. #36

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    Pa-18

    during the work I had to go back and make some modifications in the lower longerons. I put the wing in place just to get an idea of what the future looks like, but it's still early for the wing.81.png80.png79.png78.png
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    www.SkupTech.com mike mcs repair's Avatar
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    Top engine mount bolt holes not quite right




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  38. #38

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    PA-18 Super Cub

    Will I be on the right track now?
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    www.SkupTech.com mike mcs repair's Avatar
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    better!

    thats as good of a picture I could get... it's hanging from the ceiling in my shop...

    maybe someone else can give you a few more better pictures of that upper engine mount area

  40. #40

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    PA-18 pipercub

    another day of hard work, here to share with you the results. unfortunately I will have to stop the project one more time to work on another order. but as soon as I finish the next project I go back to the PA-18. hug
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