Airfoil Wing with Washout

[gsandy]

I have been trying to create a solid airfoil wing with 9 degrees washout at the wing tip.
Using the part WB Sweep I get a reasonable result but once I add the washout at the tip it goes all wrong!
Is there a better to create this solid?

OS: Windows 10 (10.0)
Word size of FreeCAD: 64-bit
Version: 0.20.25311 (Git)
Build type: Release
Branch: master
Hash: c5524bb58a7126fa2242d6137eb82ee9d54e82d4
Python version: 3.8.10
Qt version: 5.12.9
Coin version: 4.0.0
OCC version: 7.5.2
Locale: English/New Zealand (en_NZ)

[Bance]

Try curved shapes add-on.

[hammax]

... reproducing your profile by BSpline.
I don't understand what you intend with "washout"?

Wing.PNG (20.05 KiB) Viewed 1546 times

[Vincent B]

CurvedArray make a very close same shape. The end of the Bspline (trailing edge) without thickness can carry out small errors.

[gsandy]

Thanks for the two examples. But both don't give the "washout", which is a twisting of the trailing edge.
Refer to the attached screenshot where you can see the wing tip airfoil (the smaller one) trailing edge is higher than the root airfoil (which is horizontal. The leading edge remains horizontal as well.
The reason to do this is so that the wing tip portion of the wing stalls after the root portion the the wing.
Look forward to to further comments.

[gsandy]

I got it solved.

The root airfoil was generated with Airfoil_Import_Scale macro with the DWire option (previously I used BSpline option).
The tip airfoil was a clone of the root airfoil, scaled, re positioned and rotated.
Then I used the Part WB Loft. This got the 9 degrees washout at the trailing edge of the tip airfoil I was wanting.

How do I "remove" the longitudinal lines, refer attached?

[hammax]

... I would call the "washout" Twist or Pitch.
Your root is a wire/polygon profile - a BSpline would be smooth.
(Testprofil_2 something to play with - look at curvature combs from CurvesWB)

Wing_2.PNG (29.04 KiB) Viewed 1396 times

[gsandy]

Thanks Hammax. The airfoil sketch included in your attachment was great, I will experiment with it later on.
Tried the Comb feature of the Curves WB but the created combs did not appear in the selection list in the Part WB - Loft!
Cheers Sandy.

[gsandy]

Thanks again Hammax that airfoil sketch works brilliantly!

[tino]

@Hammax wie könnte man so ein Wing im Freecad verstärken für ein 3D Print?
Beispiel siehe https://hackaday.com/2022/08/26/a-guide ... aft-wings/
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