Making a shell from an airplane fuselage - how to?

[Anonymous]

Hi,

I'm trying to design a radio control airplane, and I'm facing some issue... I've designed the structure of the fuselage I want to work on, and now is time to prepare a shell of 1.5mm thick, in order to start working on the interior.

For some reason, the SHELL command does not allow me to make a shell..

The response I get from the system is:

   Could not create a new shell
     010-Amsoil Quickie V2-20170308-040.ipt: Errors occurred during update
       Shell6: Could not build this Shell
         The specified Shell thickness is too large. Try with a value smaller than 0.770 mm.

This is my second attempt, first one did work perfectly albeit of some other error I want to fix in this version...

Can somebody help me? the fuse is attached.

Thanks!!!!

[Anonymous]

Hi,

I'm trying to design a radio control airplane, and I'm facing some issue... I've designed the structure of the fuselage I want to work on, and now is time to prepare a shell of 1.5mm thick, in order to start working on the interior.

For some reason, the SHELL command does not allow me to make a shell..

The response I get from the system is:

   Could not create a new shell
     010-Amsoil Quickie V2-20170308-040.ipt: Errors occurred during update
       Shell6: Could not build this Shell
         The specified Shell thickness is too large. Try with a value smaller than 0.770 mm.

This is my second attempt, first one did work perfectly albeit of some other error I want to fix in this version...

Can somebody help me? the fuse is attached.

Thanks!!!!

[johnsonshiue · Accepted solution]

Hi Riccardo,

I changed a few things in the model and I can shell it to 5mm. First, the sections have G0 continuity (non-tangent). This is not good for Loft because Loft surface is supposed to be smooth (up to G2). Second, the Merge Tangent Faces option is not turned on in the Loft features.

Please take a look and let me know if you have any question.

Many thanks!

[johnsonshiue · Accepted solution]

Hi Riccardo,

I changed a few things in the model and I can shell it to 5mm. First, the sections have G0 continuity (non-tangent). This is not good for Loft because Loft surface is supposed to be smooth (up to G2). Second, the Merge Tangent Faces option is not turned on in the Loft features.

Please take a look and let me know if you have any question.

Many thanks!

[Anonymous]

Hi Johnson,

first of all, thanks for your quick response, You nailed my errors in no time! thanks.

now, trying to reproduce your changes I think I'm missing something in section "YZ090-Separation-010", because I'm not able to apply the second loft. I corrected all the sections by applying tangent constraints, but still there is no way to generate a smooth loft using the different sections.

As summary of what I did, up to this moment:
Delete all the lofts and combinations.

Add two tangent constraints to section "YZ030-Firewall-010", on the small curves above and below.
Add two tangent constraints to section "YZ050-Front Cockpit-010", on the small curves above and below.

Redo the ellipse in section "YZ100-Front Fin-010" and constraint it to the intersection points to 3drails.

Redo the ellipse in section "YZ130-Rear Fuse-010" and constraint it to the intersection points to 3drails.

Build the first loft following your instructions

but while building the second loft, I cant because something is missing. Would you be so king as to point me to my error?

Thanks,

[Anonymous]

Hi Johnson,

first of all, thanks for your quick response, You nailed my errors in no time! thanks.

now, trying to reproduce your changes I think I'm missing something in section "YZ090-Separation-010", because I'm not able to apply the second loft. I corrected all the sections by applying tangent constraints, but still there is no way to generate a smooth loft using the different sections.

As summary of what I did, up to this moment:
Delete all the lofts and combinations.

Add two tangent constraints to section "YZ030-Firewall-010", on the small curves above and below.
Add two tangent constraints to section "YZ050-Front Cockpit-010", on the small curves above and below.

Redo the ellipse in section "YZ100-Front Fin-010" and constraint it to the intersection points to 3drails.

Redo the ellipse in section "YZ130-Rear Fuse-010" and constraint it to the intersection points to 3drails.

Build the first loft following your instructions

but while building the second loft, I cant because something is missing. Would you be so king as to point me to my error?

Thanks,

[johnsonshiue]

Hi Riccardo,

I looked at the part you attached. I am not sure what change you made but the bottom rail no longer intersects with the section profile. All rails must intersect with the sections on the boundary.

Many thanks!

[johnsonshiue]

Hi Riccardo,

I looked at the part you attached. I am not sure what change you made but the bottom rail no longer intersects with the section profile. All rails must intersect with the sections on the boundary.

Many thanks!

[Anonymous]

Seen that. 

Thanks for your kind support!

[Anonymous]

Seen that. 

Thanks for your kind support!