Mar 02, 2013, 09:11 PM
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Calgary, AB, Canada
Joined Oct 2002
1,801 Posts
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Hmmm.. there might be a few things going on there. Im not a pro, but my sense is that you are trying jam two quite disimilar sections together without giving it enough info.
If you want to loft as a solid, which would offer a lot of advantages:
- the sections should be continous loops (example black lines)
- if you can, avoid lines converging to a point like at your trailing edge (red elipse). Better to be a minimum thickness vertical segment TE or radius, it may help & probably what you have in real life anyway.
- utilize the airfoil upper & lower curves as guide curves (green lines), it will flow the loft better
- a technique I have seen a lot is only sketch the half section & then mirror about the center plane since the fuse is symetrical. This can help with lofting especially with spline based sections & further allow you to define tangency aboutthe center line
I did an example & used 2 sections similar to yours. But lofting form basically a 4 sided rectangle to a multi-segmented section like your tailpipe is pushing it in any event, they are so un-similar.
You could do surfaces too:
- but maybe better to break it down into logical chunks: upper surface + vertical edge surface + lower surface. Everything controlled by their respective guide curves, ideally smooth splines.
- if all individual surfaces look good, then knit the chunks
You really should get a book or DVD. There is a lot of technique & dos & donts with this stuff regardless of teh cad program. Trying to stumble through on your own is the long road.
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