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Merging two object gap and classic self-intersecting geometry error

Question asked by Le Dude on Nov 16, 2018
Latest reply on Nov 29, 2018 by Le Dude

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Hi all.

So I've been playing around with the wing design for my RC and I'm now faced with this issue. If you looked at this picture, the wing and the wingtip are not intersecting perfectly. Is there anything in the set up that I need to be aware of to make it the intersection complete without gap?

When I tried to generate the loft for the wingtip, if I choose one of the guideline for the wingtip loft, the wingtip got generated but it looks weird. However when I used both of the front and the back guideline, the wingtip is giving me a self-intersecting geometry error and for the life of me, I just couldn't figure it out.

I had tried to use the regular loft with thin and surface loft and added the offset surface to generate the thin and they both just don't blend in nicely.. Can you help with a suggestion on how I should fix this? Many thanks again.

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sample proto.zip297.0 KB

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Krzysztof Wojcik Nov 17, 2018 6:22 AM

Hello.

I will not make comments to the wing geometry because i'm not an expert in aerodynamics but i think that there is something wrong.

You could do the loft operation in one, but i would do two small changes. First edit the "Right Rear Wingtip Guide Line" sketch and draw a spline with tangent relation to "Right Rear Wing Guide Line". Second, replace the "Right Front Wingtip Guide Line" sketch with 3D sketch and add spline with tangent relation to "Right Front Wing Guide Line".

Then you can use loft operation using sections and guide lines. This will give you smooth transition between wing and wingtip.

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Le Dude @ Krzysztof Wojcik on Nov 18, 2018 9:00 PM

Thanks Krzysztof Wojcik Maybe I'm not understanding it correctly. I tried to what you were saying, (assuming I understand you correctly) and I'm facing this error.

Do you mind attaching the file that you mod, so I can dissect it and see what you mean? I tend to learn faster by seeing how others work. Many thanks in advance for diving into it and try to explain it to me how to fix the issue.

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Krzysztof Wojcik @ Le Dude on Nov 19, 2018 12:41 AM

File attached, it's SW2019 part file.

From your screenshot it's hard to say why you have a problem to add tangent relation. For the rear wing tip guide line i just removed the existing spline and made a new one with tangent relation to wing guide line. For the front guide line i have made a 3D sketch and draw a spline from wing to wingtip and also added tangent relation to wing guide.

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sample proto_wing.SLDPRT.zip194.5 KB

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Le Dude @ Krzysztof Wojcik on Nov 19, 2018 1:50 PM

Thanks Krzysztof Wojcik That's exactly what I did. Removed the existing spline and made a new one with the tangent relation to wing guide and when I tried to create the tangent relation to the Wing guideline, it throws the error tantrum per the screenshot. I'll take a look at your file to see what I missed and hopefully that helps but would you mind down convert it? I have a SW2018 and it refused to open 2019.. Many thanks again for your help.

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Le Dude @ Le Dude on Nov 19, 2018 4:49 PM

Looks like it's a known feature of solidworks that one can't downgrade save as to the older version of the solidworks. So, I'm not sure how I'm going to resolve this one, Krzysztof Wojcik.

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Krzysztof Wojcik @ Le Dude on Nov 26, 2018 1:05 AM

Hello and sorry for the late response. I was out of office last week.

I'm sure that there are people with multi SW installations that could help and make a SW2018 model.

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Le Dude @ Krzysztof Wojcik on Nov 29, 2018 1:10 PM

Thanks for your help again. Krzysztof Wojcik One more question if you don't mind? The edge at the bottom of the airfoil is very thin. I'm curious whether there's a way to define the thickness of the bottom edge with SW? I'm trying to 3d print the sample wing just to see how it looks since I'm a visual person and the result comes out to be so thin that it breaks all the time. So I'm wondering if I could just define the bottom edge to be a certain thickness and hopefully it comes out better when it's printed. Please advise?

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6 Replies

Krzysztof Wojcik Nov 17, 2018 6:22 AM
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Hello.
I will not make comments to the wing geometry because i'm not an expert in aerodynamics but i think that there is something wrong.
You could do the loft operation in one, but i would do two small changes. First edit the "Right Rear Wingtip Guide Line" sketch and draw a spline with tangent relation to "Right Rear Wing Guide Line". Second, replace the "Right Front Wingtip Guide Line" sketch with 3D sketch and add spline with tangent relation to "Right Front Wing Guide Line".
Then you can use loft operation using sections and guide lines. This will give you smooth transition between wing and wingtip.
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- Le Dude @ Krzysztof Wojcik on Nov 18, 2018 9:00 PM
  Mark Correct
  Correct Answer
  Thanks Krzysztof Wojcik Maybe I'm not understanding it correctly. I tried to what you were saying, (assuming I understand you correctly) and I'm facing this error.
  Do you mind attaching the file that you mod, so I can dissect it and see what you mean? I tend to learn faster by seeing how others work. Many thanks in advance for diving into it and try to explain it to me how to fix the issue.
  Like • Show 1 Like1
  Actions
  - Krzysztof Wojcik @ Le Dude on Nov 19, 2018 12:41 AM
    Mark Correct
    Correct Answer
    File attached, it's SW2019 part file.
    From your screenshot it's hard to say why you have a problem to add tangent relation. For the rear wing tip guide line i just removed the existing spline and made a new one with tangent relation to wing guide line. For the front guide line i have made a 3D sketch and draw a spline from wing to wingtip and also added tangent relation to wing guide.
    Attachments
    sample proto_wing.SLDPRT.zip194.5 KB
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    - Le Dude @ Krzysztof Wojcik on Nov 19, 2018 1:50 PM
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      Correct Answer
      Thanks Krzysztof Wojcik That's exactly what I did. Removed the existing spline and made a new one with the tangent relation to wing guide and when I tried to create the tangent relation to the Wing guideline, it throws the error tantrum per the screenshot. I'll take a look at your file to see what I missed and hopefully that helps but would you mind down convert it? I have a SW2018 and it refused to open 2019.. Many thanks again for your help.
      Like • Show 1 Like1
      Actions
      - Le Dude @ Le Dude on Nov 19, 2018 4:49 PM
        Mark Correct
        Correct Answer
        Looks like it's a known feature of solidworks that one can't downgrade save as to the older version of the solidworks. So, I'm not sure how I'm going to resolve this one, Krzysztof Wojcik.
        Like • Show 1 Like1
        Actions
      - Krzysztof Wojcik @ Le Dude on Nov 26, 2018 1:05 AM
        Mark Correct
        Correct Answer
        Hello and sorry for the late response. I was out of office last week.
        I'm sure that there are people with multi SW installations that could help and make a SW2018 model.
        Like • Show 1 Like1
        Actions
        Le Dude @ Krzysztof Wojcik on Nov 29, 2018 1:10 PM
        Mark Correct
        Correct Answer
        Thanks for your help again. Krzysztof Wojcik One more question if you don't mind? The edge at the bottom of the airfoil is very thin. I'm curious whether there's a way to define the thickness of the bottom edge with SW? I'm trying to 3d print the sample wing just to see how it looks since I'm a visual person and the result comes out to be so thin that it breaks all the time. So I'm wondering if I could just define the bottom edge to be a certain thickness and hopefully it comes out better when it's printed. Please advise?
        Like • Show 1 Like1
        Actions

Merging two object gap and classic self-intersecting geometry error

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