NX 7.5: Create NACA 0010 Airfoil Using text file coordinates
NX 7.5: Create NACA 0010 Airfoil Using text file coordinates
(OP)
Hello All,
I have searched this topic and find that I am still unclear on how to do this. I am able to retrieve the airfoil geometry from sites such as http://airfoiltools.com/airfoil/details?airfoil=na... from the Dat File section.
Now it is my understanding that the points from the site above actually lie on the airfoil surface. Is there a way to import these points and then fit a curve to them? I tried from within the Sketcher Environment using Insert > Curves > Fit Spline and then used the open file dialog. But that creates a spline using the airfoil coordinates as "poles" and so the curve does not pass through the points. Using the method above, I do not see a "through points" option, so I am sure I am just doing this wrong.
Can anyone offer some guidance on this?
Than you.
I have searched this topic and find that I am still unclear on how to do this. I am able to retrieve the airfoil geometry from sites such as http://airfoiltools.com/airfoil/details?airfoil=na... from the Dat File section.
Now it is my understanding that the points from the site above actually lie on the airfoil surface. Is there a way to import these points and then fit a curve to them? I tried from within the Sketcher Environment using Insert > Curves > Fit Spline and then used the open file dialog. But that creates a spline using the airfoil coordinates as "poles" and so the curve does not pass through the points. Using the method above, I do not see a "through points" option, so I am sure I am just doing this wrong.
Can anyone offer some guidance on this?
Than you.





RE: NX 7.5: Create NACA 0010 Airfoil Using text file coordinates
The above procedure will create a spline through the points in the file. If you want/need to see the actual point objects, go to Insert -> Datum/Point -> Point set and choose Spline Points, Defining Points. Point objects will be created at the defining points (the points listed in the .dat file).
Starting in NX 8.5 the process will be a little different; you will create the point set from the .dat file directly then fit a curve to the point set.
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RE: NX 7.5: Create NACA 0010 Airfoil Using text file coordinates
Then you can use the points for whatever use, Insert -curve - fit spline.
Regards,
Tomas
RE: NX 7.5: Create NACA 0010 Airfoil Using text file coordinates
1) I have always been under the impression that curves that do not live in SKETCHES are *bad*. I believe that is because they are not "tied" to anything. But since these curves are defined in space by their coordinates, than they would be OK right?
2) I was thinking that if I did want to get the spline into a sketch, I could go into SKETCHER and use Project Curves to get it into the sketch. When I do this, the endpoints of the spline are not constrained (using Dat File below). This confuses me. Shouldn't all of the points be fully defined by their (x,y,z)- coordinates?
3) The NACA Data files are clearly based on using (0,0,0) as their origin. But there will be many (if not all) times when I do not want the leading edge of the airfoil at (0,0,0). I could alter the dat file coordinates (with a lot of work), but there I am sure there is a much better way to do it? I should be able to project the sketch into a sketch and then move/constrain its overall shape to other objects.
Thanks again.
NACA 0010 Dat File
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RE: NX 7.5: Create NACA 0010 Airfoil Using text file coordinates
I don't recommend projecting the resulting spline into a sketch. The result will be a fixed curve in your sketch, the position of which depends on the position of the original curve. Use the original spline and if you need to move the spline, use the "move object" command.
www.nxjournaling.com
RE: NX 7.5: Create NACA 0010 Airfoil Using text file coordinates
Thanks again for your help. Here is an issue I am encountering: The data file for the NACA airfoil leaves the training edge "open" like at the top of this -> /\
there is a "gap". In a sketch, I could add an arc that is coincident to the endpoints and tangent to the airfoil. But outside of sketcher, I am not sure how to accomplish this?
RE: NX 7.5: Create NACA 0010 Airfoil Using text file coordinates
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RE: NX 7.5: Create NACA 0010 Airfoil Using text file coordinates
Inside the sketcher you can use the 'Insert > Curve from Curves > Add existing curves'.
This can move the spline into Sketcher environment.
Thanks,
Mathi K
RE: NX 7.5: Create NACA 0010 Airfoil Using text file coordinates
RE: NX 7.5: Create NACA 0010 Airfoil Using text file coordinates
Thanks again for all of your help.