Adding a wing or fuselage cross section

[Peter F]

I am using VSP windows version 2.2.2

I tried to add a sixth fuselage cross section at the tail of a model, but clicking the add button didn't seem to do anything. I can't get the cross section edit window to advance past five, so it doesn't seem like there is anything there. However, if I pull section five forward it makes a hole in the shape of the cross section instead of moving the tail of the fuselage forward, so it looks like I have a phantom. There is no way to select it so there is no way to delete it or move it. It takes the same shape as section five, but can't be directly modified. Anyone ever seen this?

I thought I'd try the same thing with a wing and got a similar result. Adding a section to a wing does not appear to do anything and the cross section window will not advance past the original number of sections. Interestingly, the foil window will advance and shows a duplicate of the section I was viewing when I hit the add button. So I have a wing with five cross sections and six airfoils. Any ideas? Thanks.

[Mark Moore]

You can only add cross sections that are after the first it before the last, you can't tag on extras.  So vsp is working correctly, there are many very good reasons why you can't add sections before the first or after the last

--
You received this message because you are subscribed to the Google Groups "OpenVSP" group.
To unsubscribe from this group and stop receiving emails from it, send an email to openvsp+u...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
 
 

[Peter F]

Thanks, that was quick.

I went back and added a section before the last as you said, and it worked fine. I still have that immobile section that I can't delete or move, that got created when I tried to add after the last section.

To unsubscribe from this group and stop receiving emails from it, send an email to openvsp+unsubscribe@googlegroups.com.

[Mark Moore]

I can't replicate this.  I think what you have done is that the last cross section is not set at the 1.0 location (right under the Cross Section ID).  It's probably at .95 or something (i.e. 95% of whatever the length parameter is specified at).  VSP doesn't force your last cross section to be at the 1.0 (100% location) - just in case for some weird reason that may be of use to someone...

Please check the location of the last section, and if that's not it - attach the file for me to check.

Mark

To unsubscribe from this group and stop receiving emails from it, send an email to openvsp+u...@googlegroups.com.

[Peter F]

I can move the last section where ever I want, but the tail stays at 1 and the last section just makes a hole.

The Google server is erroring out when I try to upload the file. I will try again later or can email to you. 

[Peter F]

I can't upload the file. I get the same google error in three different browsers including chrome, with and without a firewall. Can I email it somewhere?

[Mark Moore]

Sure you can email it to me at mark.d...@nasa.gov

Mark

[Peter F]

sent this morning from niio1

[Mark Moore]

I just reviewed this geometry, and the problem is exactly what I already said.  The last fuselage cross section wasn't specified as being at the 1.0 location (instead it was specified to be at .9726).  This causes the last cross section to be pushed into the fuselage.  Also the last cross section should always be specified to be a point to close the body to be water tight.  If you want the back end to be blunt, then you can put the last 2 cross sections very close to each other (i.e. have the 2nd to last x-sec be a diameter of 1.0 ft at .999 location and then the last diameter be a point at 1.0).

Let me know if this makes sense to you and you still have a problem.

Mark

[Peter F]

OK, I understand the end of the fuselage is always at 1 even though the last cross section does not need to be. Thanks.