supercub cad-3d

O

osvaldosurf

Registered User

• Apr 12, 2017

• #1

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.

 

Attachments

• 
  1.png

  553.1 KB · Views: 412
• 
  2.png

  369.9 KB · Views: 311
• 
  3.png

  465.9 KB · Views: 309
• 
  4.png

  439.7 KB · Views: 266
• 
  5.png

  236.5 KB · Views: 282
• 
  6.png

  675.4 KB · Views: 298

J

Jasperfield

Registered User

NC

• Apr 12, 2017

• #2

Looks good. Keep at it, there are lots of parts. I'm anxious to see the completed project.

 

mike mcs repair

Registered User

chugiak AK

• Apr 12, 2017

• #3

BTW... the actual APPROVED ribs made by the different manufactures are all DIFFERENT shapes & sizes than the drawings, and each others parts...

 

O

osvaldosurf

Registered User

• Apr 14, 2017

• #4

 

Attachments

• 
  7.png

  507.2 KB · Views: 253
• 
  8.png

  341.1 KB · Views: 289
• 
  9.png

  760.6 KB · Views: 266
• 
  10.png

  706 KB · Views: 243
• 
  11.png

  847.9 KB · Views: 338
• 
  12.png

  590.3 KB · Views: 253

skywagon8a

MEMBER

SE Mass MA6

• Apr 14, 2017

• #5

osvaldosurf said:

View attachment 30953

Click to expand...

Study this one. You have an elevation shift where you don't want it.

 

O

osvaldosurf

Registered User

• Apr 15, 2017

• #6

 

Attachments

• 
  13.png

  570 KB · Views: 251
• 
  14.png

  706.5 KB · Views: 272
• 
  15.png

  734.7 KB · Views: 253
• 
  16.png

  731.8 KB · Views: 239
• 
  17.png

  251.1 KB · Views: 269

O

osvaldosurf

Registered User

• Apr 21, 2017

• #7

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 rear spar has a positive dihedral that the front spar, can anyone confirm me?

 

Attachments

• 
  19.png

  498.7 KB · Views: 243
• 
  20.png

  594.8 KB · Views: 411
• 
  21.png

  395.5 KB · Views: 231
• 
  22.png

  612.8 KB · Views: 235
• 
  23.png

  690.4 KB · Views: 264
• 
  24.png

  668.6 KB · Views: 249

skywagon8a

MEMBER

SE Mass MA6

• Apr 21, 2017

• #8

That is the washout in the wing. http://www.fadodge.com/fad_pdfs/Cor...ub.pdf?phpMyAdmin=EsjPx8hgioQlsa8ztqFncHAgdU4

 

O

osvaldosurf

Registered User

• Apr 26, 2017

• #9

engine mount piper original e dynafocal engine mount

 

Attachments

• 
  40.png

  503.2 KB · Views: 250
• 
  43.png

  551.6 KB · Views: 305

C

Cappt

MEMBER

Reno, NV

• Apr 27, 2017

• #10

View attachment 31116View attachment 31117



Text came out backwards. Original is on left, Dyn on right.

 

O

osvaldosurf

Registered User

• Apr 28, 2017

• #11

Really this is the most difficult project I have ever done.

 

Attachments

• 
  44.png

  1 MB · Views: 219
• 
  45.png

  741.5 KB · Views: 221
• 
  46.png

  293.9 KB · Views: 327
• 
  47.png

  919.8 KB · Views: 222

skywagon8a

MEMBER

SE Mass MA6

• Apr 29, 2017

• #12

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.

 

Q

qsmx440

Registered User

• Apr 29, 2017

• #13

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!

 

O

osvaldosurf

Registered User

• Apr 29, 2017

• #14

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 !!!

 

Q

qsmx440

Registered User

• Apr 29, 2017

• #15

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!

 

CamTom12

Registered User

Huntsville, AL

• Apr 30, 2017

• #16

qsmx440 said:

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.

Click to expand...

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!

 

O

osvaldosurf

Registered User

• Apr 30, 2017

• #17

 

Attachments

• 
  49.png

  294.6 KB · Views: 198
• 
  50.png

  477.4 KB · Views: 175
• 
  51.png

  673.6 KB · Views: 199
• 
  52.png

  838 KB · Views: 187
• 
  53.png

  253.8 KB · Views: 192

O

osvaldosurf

Registered User

• Apr 30, 2017

• #18

 

Attachments

• 
  54.png

  703 KB · Views: 183
• 
  55.png

  678.5 KB · Views: 188
• 
  56.png

  621.6 KB · Views: 193

CamTom12

Registered User

Huntsville, AL

• Apr 30, 2017

• #19

CamTom12 said:

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!

Click to expand...

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.

 

O

osvaldosurf

Registered User

• May 1, 2017

• #20

 

Attachments

• 
  57.png

  386.7 KB · Views: 177
• 
  58.png

  479.4 KB · Views: 164
• 
  59.png

  528.9 KB · Views: 158
• 
  60.png

  733 KB · Views: 176
• 
  61.png

  335.6 KB · Views: 190
• 
  62.png

  345 KB · Views: 176
• 
  63.png

  365.7 KB · Views: 184

O

osvaldosurf

Registered User

• May 3, 2017

• #21

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

 

Attachments

• 
  65.png

  275.5 KB · Views: 304

O

osvaldosurf

Registered User

• May 3, 2017

• #22

After a lot of work, I got it.

 

Attachments

• 
  66.png

  904.4 KB · Views: 243
• 
  67.png

  514.6 KB · Views: 210

E

eskimo77

Registered User

Kenai, Alaska

• May 3, 2017

• #23

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/archive/index.php/t-47805.html

 

mike mcs repair

Registered User

chugiak AK

• May 3, 2017

• #24

eskimo77 said:

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/archive/index.php/t-47805.html

Click to expand...

plywood pattern and wood router it? spiral cut pattern bit.... i hear thats how the one guy around here makes new flap tracks....

 

B

Beaverpilot

Registered User

Manitoba Canada

• May 6, 2017

• #25

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.


Sent from my iPhone using SuperCub.Org

 

O

osvaldosurf

Registered User

• May 7, 2017

• #26

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

 

O

osvaldosurf

Registered User

• Aug 30, 2017

• #27

Wing available for download

https://grabcad.com/library/piper-pa-18-wing-1

 

D

djpierred

Registered User

• Oct 19, 2017

• #28

Incredible job, thank you to share it!

 

Colorado-Cub

MEMBER

Buena Vista, CO

• Oct 19, 2017

• #29

osvaldosurf said:

Wing available for download

https://grabcad.com/library/piper-pa-18-wing-1

Click to expand...

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...

 

O

osvaldosurf

Registered User

• Oct 19, 2017

• #30

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.