Joseph Pope wrote:
... and a 3d set of points ....
Aren't those points planar? Why a 3D sketch?
I recommend using a few points as possible and you might want to include some guide curves.
The reason I used a 2d and 3d sketch is I found a macro that would plot all of the points for my naca airfoil but it would only do one 3d and one 2d set of points per part.
The trick with lofts is to make sure that both sketches are selected by clicking near the same relative points. Doing so ensures those points are connected as the start of the loft.
Canard - KL.SLDPRT.zip 180.4 KB
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Kelvin is correct
You have 80 segments in each sketch. you have to make sure to select close to the same end of the corresponding sketch segment in each sketch
In the image below I have selected the right hand end of the line close to the sharp end of your sketch
Below you will see that I have selected the right hand end of the corosponding line in the 3d sketch. You will also see that SW has placed a blue do on the right hand end of the line
SW has also place a blue dot on the right hand end of the first line I created, If I had selected a different line or the left hand end of the line the blue dot will be closest to where I had selected and the loft would be twisted. You can drag the dot along the sketch if you did not select the correct place in the sketch and this will take the twist out of the loft
You now have a finished loft
If you want to make a smoother loft. edit your sketches and using the fit spline command convert all the straight line segments into a spline and then do the loft to end up with this
As Dr. Mather has suggested, most airfoils are created using a spline, not line segments. Is there are reason you are doing it this way? You can keep your line/points, but you might want to try to create new sketches and create a spline that mimics the shape of the airfoil cross section or use an equation curve.
See attached EDU version
There are lots of little things that you need to know about using splines but they are very appropriate (and indispensable) for this type of application.
- I created a single spline using 7 points starting at the trailing edge but leaving the last point approx. to the first point (do not connect)
- then I made the leading edge point tangency/magnitude handle at the leading edge vertical in direction by clicking on the widget and then RMB and clicking on the vertical contraint in the minibar.
- I then held down <ALT> key and dragged the end dot of the vertical widget to symmetrically adjust the magnitude at out.
- I then split the leading edge at the interim spline point (select spline and RMB>split entity)
- then connected the points of the "two splines" at the trailing point back together
- and then did some adjustment of the tangency vector and magnitude handles
- and then used these instead of your sketches for your loft.
canard-mab.SLDPRT.zip 91.2 KB
Got it! Thanks for all the help gents.