FW190-A8 1/10th

Show off your FreeCAD projects here!
User avatar
Zolko
Posts: 1189
Joined: Mon Dec 17, 2018 10:02 am

FW190-A8 1/10th

Postby Zolko » Wed Oct 21, 2020 2:09 pm

I've started to model a Focke-Wulf 190-A8 at 1/10th scale, to make an RC plane with it. The fuselage is supposed to be 3D-printed, while the wings should be made with classic wood structure, laser-cut if possible.

First, I imported into Inkscape various drawings of scale models, scaled them to the correct size, and superimposed them in layers. This is not as trivial as it sounds because the drawings, supposedly of scale RC models, differ quite some. I then drew the outlines of the side-view, cockpit cut-out, fuselage frames ...

Figure_Inkscape.png
Figure_Inkscape.png (289.63 KiB) Viewed 1970 times

... exported these as SVG file, and imported it, as-is, into FreeCAD:


Figure_SVG.png
Figure_SVG.png (53.07 KiB) Viewed 1970 times


I then created different Part containers in a new document, and copied the imported paths into them. Then, I moved the Parts containing the imported paths to their correct location:

Figure_Wires.png
Figure_Wires.png (34.62 KiB) Viewed 1970 times

Now, I more-or-less have a wire-frame of the FW190 fuselage. So ... what's next ?
try the Assembly4 workbench for FreCAD v0.19
install with Tools > Addon Manager > Assembly4 — tutorials here and here
thschrader
Posts: 1984
Joined: Sat May 20, 2017 12:06 pm
Location: Germany

Re: FW190-A8 1/10th

Postby thschrader » Wed Oct 21, 2020 5:17 pm

Zolko wrote:
Wed Oct 21, 2020 2:09 pm
...
Now, I more-or-less have a wire-frame of the FW190 fuselage. So ... what's next ?
See here:
https://forum.freecadweb.org/viewtopic.php?p=218623

It’s a Long Way to Tipperary. :)
HardRock
Posts: 83
Joined: Tue Mar 13, 2018 5:50 am
Location: Russian Federation

Re: FW190-A8 1/10th

Postby HardRock » Thu Oct 22, 2020 2:52 pm

Good beginning, next you need to make shell :)

First of all I strongly suggest to choose an airfoil for wing and airfoil geometry (twist).
Just redraw from original drawing is not a good idea becuase this balsa model look like was much bigger and your model will fly worse than original.
If you are not familar enough with aerodynamics or just dont want to make a mind for this, I suggest to rotate wing tip profile 2-3 degrees nose-down if wing has no twisted already.

Interesting project, stay in touch :)
User avatar
Zolko
Posts: 1189
Joined: Mon Dec 17, 2018 10:02 am

Re: FW190-A8 1/10th

Postby Zolko » Fri Oct 23, 2020 5:23 pm

Taking shape: I use Part_Loft between fuselage sections, that are adjusted for smooth flow.

screenshot.png
screenshot.png (83.45 KiB) Viewed 1622 times
try the Assembly4 workbench for FreCAD v0.19
install with Tools > Addon Manager > Assembly4 — tutorials here and here
thschrader
Posts: 1984
Joined: Sat May 20, 2017 12:06 pm
Location: Germany

Re: FW190-A8 1/10th

Postby thschrader » Fri Oct 23, 2020 7:09 pm

I was there...
https://www.luftfahrtmuseum-hannover.de ... ulf-fw-190
fw190pic.JPG
fw190pic.JPG (25.18 KiB) Viewed 1584 times
User avatar
Zolko
Posts: 1189
Joined: Mon Dec 17, 2018 10:02 am

Re: FW190-A8 1/10th

Postby Zolko » Sat Oct 31, 2020 1:45 pm

Progressing slowly, but the loft produces some wrinkles that I fail to get rid of. I also tried Curves and CurvedShapes WB, but not much luck so far.

FW190_wrinkles.png
FW190_wrinkles.png (119.54 KiB) Viewed 1188 times
try the Assembly4 workbench for FreCAD v0.19
install with Tools > Addon Manager > Assembly4 — tutorials here and here
User avatar
Zolko
Posts: 1189
Joined: Mon Dec 17, 2018 10:02 am

Re: FW190-A8 1/10th

Postby Zolko » Sat Oct 31, 2020 10:40 pm

I somehow fail to make progress, so I've uploaded the fuselage file into my Examples repository, so if someone wants to give a try to do better would be very helpful. There is no license, it's public domain. I'd be especially happy to see improvements and techniques from masters of the Curves and CurvedShapes workbenches.

https://github.com/Zolko-123/FreeCAD_Ex ... ster/FW190
try the Assembly4 workbench for FreCAD v0.19
install with Tools > Addon Manager > Assembly4 — tutorials here and here
User avatar
-alex-
Posts: 726
Joined: Wed Feb 13, 2019 9:42 pm
Location: France

Re: FW190-A8 1/10th

Postby -alex- » Sun Nov 01, 2020 3:08 am

Zolko wrote:
Sat Oct 31, 2020 10:40 pm
, so if someone wants to give a try to do better would be very helpful.
I can't access FC those days, furthermore I'm not a master of Curves WB, but just my 2 cts, you could maybe use Curves_GordonSurface.
See https://forum.freecadweb.org/viewtopic.php?f=8&t=29632
User avatar
GlouGlou
Posts: 2754
Joined: Sun Apr 05, 2015 9:02 am
Location: La Rochelle, France

Re: FW190-A8 1/10th

Postby GlouGlou » Sun Nov 01, 2020 11:22 am

You can discretize the joincurve. Sometimes that's give a better result. But several tries must be do.
Attachments
Capture.JPG
Capture.JPG (86.09 KiB) Viewed 991 times
Last edited by GlouGlou on Sun Nov 08, 2020 3:05 pm, edited 1 time in total.
User avatar
Zolko
Posts: 1189
Joined: Mon Dec 17, 2018 10:02 am

Re: FW190-A8 1/10th

Postby Zolko » Mon Nov 02, 2020 12:08 pm

thanx for the suggestions, I'll try them
try the Assembly4 workbench for FreCAD v0.19
install with Tools > Addon Manager > Assembly4 — tutorials here and here