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dmojay1-Visitor
1-Visitor
January 29, 2018
Solved

Extruding/Blending a fuselage?

  • January 29, 2018
  • 2 replies
  • 14088 views

Hello everyone,

 

I am trying to figure out how to take my side view of my fuselage and make it into an extrude with circular sides. I have tried all of the blends but I'm new to creo and I don't know what to do. I just want it to look like an egg, basically.creo question.JPG

Best answer by Patriot_1776

Are those green lines curves used to control the boundary blend?  If so, you can see the ripple follows the curve.  If so, get rid of the extra curves.  The only curves I used are highlighted in red in my pic.  too many curves cause the ripples, you only need 3 total for each quilt.  Left, top, and right used for the top quilt, and I made sure the boundary edge conditions were normal to the top datum plane.  For the bottom surf, similar, but I used the edges of the top surf instead of the L and R curves, and used curvature continuous (to the top quilt) for the edge conditions, then I merged it.

2 replies

Patriot_1776
Patriot_177622-Sapphire II
22-Sapphire II
January 29, 2018

Based on those 2 curves, it will never have anything "circular".  It will need to be a boundary blend.  I did it in 6 features.  When you do a BB, you have to be careful what order you pick what curves in.  I did the top half, set boundary conditions, then did the bottom half, set different boundary conditions, then merged them.  Very smooth, if not exactly C2, surfaces.

    J
    jhaston-31-Visitor
    1-Visitor
    January 30, 2018
    Use transverse cross sections, not just one single longitudinal section.
      Patriot_1776
      Patriot_177622-Sapphire II
      22-Sapphire II
      January 30, 2018

      I actually ended up using 4 longitudinal curves, top, left and right mirrored images of each other, and a bottom curve.  I made the top half, then the bottom half and even though the shape was totally non-symmetrical from top to bottom and the curves were all pretty different from each other, it came out really smooth (almost C2).

       

      I find that using a bunch of different sections leads to ripples, best to use as few curves as possible, that's why I'd recommend using longitudinal curves.

        D
        dmojay1-VisitorAuthor
        1-Visitor
        January 30, 2018

        Okay, I think I understand. Instead of using the top curve, replicate it with a few longitudinal curves and do the same for the bottom? That seems easy enough.

        However, how do I get the front and end "caps" I can get the basic shape of the hull, but I don't know how to make the ends

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