Best practice: fuselage + wing

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svenair
Posts: 74
Joined: Sat Nov 29, 2014 2:55 pm

Re: Best practice: fuselage + wing

Post by svenair » Sat Jan 04, 2020 3:13 pm

So, the Scale of the Image had not worked..

But I had drawn a little Bit of the Fuselage..

I draw the View from Above,
but this is not the Axis of the Plane that would have.

So, I angled a Datum Plane and created a new Sketch.

I take the Sketch of the last View and projected it as External Geometry,
but now I don't know how to switch it to a normal Line..
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soaring
Posts: 47
Joined: Sat Dec 31, 2016 10:27 pm

Re: Best practice: fuselage + wing

Post by soaring » Sat Jan 04, 2020 3:32 pm

currently i'm reading the book "FreeCAD For Inventors" from Brad in order to be sure i didn't missed freecad concept cause when i design i'm rapidely locked....i'll tried to help when i'll be better un basics practice, i read as fast i possible :)
svenair
Posts: 74
Joined: Sat Nov 29, 2014 2:55 pm

Re: Best practice: fuselage + wing

Post by svenair » Sat Jan 04, 2020 4:02 pm

soaring wrote:
Sat Jan 04, 2020 3:32 pm
currently i'm reading the book "FreeCAD For Inventors" from Brad in order to be sure i didn't missed freecad concept cause when i design i'm rapidely locked....i'll tried to help when i'll be better un basics practice, i read as fast i possible :)
Good Think!

I'm a bit further but, I now beeing stopped on another Point..

And I allways think, there is an Failure.

There must be Knots, where the different Sketches ore coming together in Point.

And I have no Idea, how to manage it..

Its hard..
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soaring
Posts: 47
Joined: Sat Dec 31, 2016 10:27 pm

Re: Best practice: fuselage + wing

Post by soaring » Sat Jan 04, 2020 7:33 pm

If it can help, i've just read that a macro exist for scaling : "image scaling macro"

And as i understand, there is no need to join sketchs, just select sketchs and apply a Gordon operation with curves workbench and it would deal with interpolation.

But no solid...i saw that curves author did a button to create a solid from Gordon surface created by closing it, i Guess it works as is but didn't play with it yet
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christi
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Location: Karlsruhe, Germany
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Re: Best practice: fuselage + wing

Post by christi » Sat Jan 11, 2020 12:43 pm

I have another approach to create a wing.
1. Draw or import a wing profile in the XZ layer
2. Draw the top view of the wing in the XY layer
3. Draw the front view in the YZ layer
4. Create multiple copies of the wing profile and move and resize the elements in the bounds of the top view and the front view drawings
5. Create a Loft over all the wing profiles

I have created the CurvedShapes workbench for doing 4. and 5.
https://github.com/chbergmann/CurvedShapesWorkbench

I tried to make a model of the flying wing Horten Ho 229 (also called Horten H IX)
Image

In the CurvedShapes workbench there is a menu entry "Horten HIX" that creates the above design from a script.
soaring
Posts: 47
Joined: Sat Dec 31, 2016 10:27 pm

Re: Best practice: fuselage + wing

Post by soaring » Sun Jan 26, 2020 1:38 pm

@christi : I'm very interested in the acurracy of the gordon surface approach, can you tell us if there are some possibilities with it in your workbench (i'm not an expert and not a mathematician...) ?
soaring
Posts: 47
Joined: Sat Dec 31, 2016 10:27 pm

Re: Best practice: fuselage + wing

Post by soaring » Sun Jan 26, 2020 3:10 pm

@christi, i've just played with your workbench regarding @GlouGlou post : https://forum.freecadweb.org/viewtopic. ... 9&start=20 and it works like a charm, it's so easy to do a solid for boolean operation and the cutting function will be very helpfull !

thanks to your amazing work, it seems that Glouglou use "Curved shapes" workbench and "Curves" workbench through interpolation curves available in "Curves worbench". Very smart !

one thing i dont understand now is the use of Comb from the "Curves" worbench, if someone can switch on my light :)
soaring
Posts: 47
Joined: Sat Dec 31, 2016 10:27 pm

Re: Best practice: fuselage + wing

Post by soaring » Sun Jan 26, 2020 3:50 pm

@svenair new activity on the Curves thread could be helpfull for fuselage design and your questions : https://forum.freecadweb.org/viewtopic. ... &start=540 i will ask if results can profit to this thread...
svenair
Posts: 74
Joined: Sat Nov 29, 2014 2:55 pm

Re: Best practice: fuselage + wing

Post by svenair » Fri Jan 31, 2020 11:59 am

soaring wrote:
Sun Jan 26, 2020 3:50 pm
@svenair new activity on the Curves thread could be helpfull for fuselage design and your questions : https://forum.freecadweb.org/viewtopic. ... &start=540 i will ask if results can profit to this thread...
Oh, yes I will take another lokk at it.
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