supercub cad-3d

[Colorado-Cub]

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.

 

[osvaldosurf]

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

 

[osvaldosurf]

I came back

https://osvaldoprojetos.blogspot.com.br/

 

[osvaldosurf]

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

 

[osvaldosurf]

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.

 

[osvaldosurf]

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.

 

[mike mcs repair]

Top engine mount bolt holes not quite right

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[osvaldosurf]

PA-18 Super Cub

Will I be on the right track now?

 

[mike mcs repair]

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

 

[osvaldosurf]

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

 

[osvaldosurf]

hi guys, I'm back to the pa-18 project, I've been kind of busy with some orders, I'm kind of lost in the immensity of this design. but I can walk slowly. hug

 

[Stew]

I have a completely refurbished bare PA18 fuselage on two trestles with just a few components fitted, if you need any decent images of particular areas then let me know, more than happy to sort that.

It has the seat belt and cross-brace STC's incorporated but other than that it is original.

The wings are now covered so too late to get images there.

Kind regards

Stew

 

[osvaldosurf]

many thanks Stew. More photos would help a lot, when I have difficulties in some specific areas, I inform you. I wanted to be able to dedicate myself more to this project, but there are always other works to order and I have to stop this drawing, which makes me very happy to do so.

 

[osvaldosurf]

a lot of work to make the door lower and upper. I spent two days to do this, and it's still missing many ex doorknob, internal springs etc.
more photos in detail on my blog.

 

[osvaldosurf]

windshield and cowl, there were two equally difficult parts to make.

 

[osvaldosurf]

more pictures

 

[osvaldosurf]

torque, control flap, front seat, more pictures blog.

 

[osvaldosurf]

today I completed the mirroring of the wing, and the panels. these two taking a whole day to do.

 

[osvaldosurf]

fairing fin leading edge, fin e yoke stabilizer

 

[osvaldosurf]

Dear friends, I am very difficult to understand this mechanism, someone can give me a lesson. I realized that there are two different systems, one uses a double pulley and the other uses a simple pulley, I think the os are stabilizer adjustment yoke and the other one is bungge installation. Which of the two should I follow?

 

[Beaverpilot]

The front pulley in pic 121 is for the trim indicator wire. The rear pulley is for the horizontal stabilizer. The double pulley for the trim system actuation (not pictured ) is located on the bottom of the jack screw below the yoke.


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[Beaverpilot]

Hope these will help... great work on the drawing.


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[osvaldosurf]

as you can see in the first photo, I followed the plans of the 13000, but I had a very big doubt between the plans of the 13000 and 42664. I could not understand why the steel cable passes through two pulleys, first passing double pulley and after passing pulley flap that is suspended in the spring, what was the reason for that ??? after much thinking, I understood that the reason is for the steel cable not to slide on the pulley, giving two turns on the pulley there would have been more force to turn the set. I'm sure, can anyone tell if the reason is the same?

 

[Stew]

Drawing 13000 is the latest of the two and probably sensible to illustrate that in my opinion. I came to the same conclusion that the two pulley arrangement means that each of the two grooves on the main pulley has over 50% of it's surface area covered with cable which will clearly improve friction. The arrangement at the other end of the system at the trim crank is the same principle.

Clearly the tension of the whole continuous trim cable is provided by the second "idler" pulley mounted at the end of the inline spring fixed to the fuselage.

As you will have deduced, turning the crank handle in either direction turns the screwjack which raises or lowers the "Yoke". The yoke has a tube through it connecting it to the stabilizer leading edge, raising and lowering the stabilizer leading edge, adjusting the trim of the aircraft.....simples

One other thing that I needed confirmation on was the route of the cable around the two main pulley grooves as it is physicaly possible to do it two different ways. On drawing 13000, if you look at the double groove pulley at the bottom of Section B-B, the cross sections of the cable are shown making it possible to confirm the designed route.

 

[Beaverpilot]

Go with the double pulley system. The steel cable is one continuous loop. To rig it in to the trim system. Start at the top groove at the jack screw, go around the idler pulley then go through he bottom groove of the pulley. All wraps should go clockwise.


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[Beaverpilot]

Sent from my iPhone using SuperCub.Org mobile app

 

[osvaldosurf]

final stages

 

[osvaldosurf]

a bit of a summary of yesterday's works.

 

[Stew]

I may be completely wrong but in the third image the tabs that you have shown picking up the lower tail brace rods seem to be a bit minimal. There was a modification that added a plate to this area to add strength, effectively connecting the two lower brace rods. We incorporated it with a plate welded in when we replaced the lower longerons and tail post.

 

[osvaldosurf]

I did not know about that service bulletin, it was good for you to warn me about it. in fact I want first to be faithful to the plans of 1944, first to do a historical work and to be faithful to the horiginal drawings. when I finish I will analyze (more calmly) these service bulletins and try to make the later modifications. thanks for the warning, it was very cool this.