Importing/scaling/splining and initially positioning the .dat files between the Draft & Sketcher workbenches was not an issue.
However, when trying to rotate the transition (the 45 degree wire) and the winglet root airfoil spline (90 degree wire) along the longitudinal axis, I was seeing a distortion between the leading and trailing edge points when looked at head-on from the front looking towards the rear (on the record, the leading edge is precisely where I wanted it). See attachments; these should all be on plane, not as depicted.
When I tried assembling the upper and lower lofted parts using the A2Plus workbench, yes, the leading edges between the upper and lower halves met precisely, but the trailing edges were all kind of distorted and interfered with one another.
I do not think the A2Plus WB is any part of the issue here, because I am able to assemble other stuff without an issue. Also, this distortion existed BEFORE lofting.
To give further context, the airfoil files, when imported, were rotated along the original plane to meet select angles of incidence called for in the design, meaning that the trailing edge point is not on the same plane as the leading edge point. When rotated within Draft WB, I suspect the wire splines somehow distort off-plane behind the leading edge, but not sure why.
Is there something I missing? Can I not simply rotate the airfoils along the longitudinal axis as desired? Do I need to ‘assemble’ the upper and lower halves of the airfoils, rotate as a single sub-assembly, then loft accordingly? How can I avoid this distortion.
To be transparent, the Wingtip Airfoil was 3 degrees, Transition at 0.5 degrees and the winglet root at -2. This is due to the aerodynamic performance desired from the shape.
Using the latest/greatest stable release:
Code: Select all
OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.20.1.29410 (Git)
Build type: Release
Branch: releases/FreeCAD-0-20
Hash: f5d13554ecc7a456fb6e970568ae5c74ba727563
Python 3.8.10, Qt 5.15.2, Coin 4.0.1, Vtk 8.2.0, OCC 7.6.3
Locale: English/United States (en_US)
Installed mods:
* A2plus 0.4.60f
* AirPlaneDesign 0.4.0
* Assembly4 0.12.4
* CurvedShapes 1.0.4
* Curves 0.6.4
* ExplodedAssembly
* fasteners 0.4.25
* FeedsAndSpeeds 0.5.0
* LCInterlocking
* Plot 2022.4.17
* Pyramids-and-Polyhedrons
* sheetmetal 0.2.59
* Ship 2022.4.11