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Using a twisted face to split parts

graham_lock
graham_lock Member Posts: 276 PRO
edited September 2025 in Community Support

Hi,

Below is an image of the trailing edge of an RC plane wing:

TE Ribs.png

The trailing edge is twisted when wing washout is applied which causes problems with what I want to achieve below:

  1. I need to split the ribs at the front face of the trailing edge and then delete the rearmost parts post split.
  2. I'd like to make the trailing edge profile match the rib profiles.

I did ask the AI Advisor this question: how do I split parts using a twisted face

And the answer was: Sorry, Onshape AI Advisor cannot answer this question.

Any help appreciated.

Thank you.

Best Answers

  • eric_pesty
    eric_pesty Member, pcbaevp Posts: 2,826 PRO
    edited September 2025 Answer ✓

    You should watch this, lots of very relevant and very good advice:
    https://www.youtube.com/watch?v=DVV71gpNSq8&t=2113s

    And there's an update here as well: https://youtu.be/2aNM5dsUnyw?t=1144

    Actually, this is the one I was thinking of as it specifically discusses washout:

    https://www.youtube.com/watch?v=2neCG5mwXWA
  • S1mon
    S1mon Member Posts: 4,457 PRO
    Answer ✓

    @GregBrown has done several in depth videos on modeling RC airplane wings, engines etc. I would recommend watching those if you haven't so far.

    https://www.youtube.com/watch?v=ytZVIfquMF4
    https://www.youtube.com/watch?v=DVV71gpNSq8

    Simon Gatrall | Product Development, Engineering, Design, Onshape | Ex- IDEO, PCH, Unagi, Carbon | LinkedIn

  • Matt_Shields
    Matt_Shields Member, Onshape Employees Posts: 980 EDU
    Answer ✓

    You definitely don't need a planar face to use Split Part.

    image.png

Answers

  • Matt_Shields
    Matt_Shields Member, Onshape Employees Posts: 980 EDU

    Split Part doesn't work? Maybe share your doc.

  • MDesign
    MDesign Member Posts: 1,461 PRO

    I'm no airplane design expert or even an ametuer but wouldn't it be easier to start with the surfacing of your wing and build the parts based on that skin?

  • eric_pesty
    eric_pesty Member, pcbaevp Posts: 2,826 PRO
    edited September 2025 Answer ✓

    You should watch this, lots of very relevant and very good advice:
    https://www.youtube.com/watch?v=DVV71gpNSq8&t=2113s

    And there's an update here as well: https://youtu.be/2aNM5dsUnyw?t=1144

    Actually, this is the one I was thinking of as it specifically discusses washout:

    https://www.youtube.com/watch?v=2neCG5mwXWA
  • S1mon
    S1mon Member Posts: 4,457 PRO
    Answer ✓

    @GregBrown has done several in depth videos on modeling RC airplane wings, engines etc. I would recommend watching those if you haven't so far.

    https://www.youtube.com/watch?v=ytZVIfquMF4
    https://www.youtube.com/watch?v=DVV71gpNSq8

    Simon Gatrall | Product Development, Engineering, Design, Onshape | Ex- IDEO, PCH, Unagi, Carbon | LinkedIn

  • graham_lock
    graham_lock Member Posts: 276 PRO

    Thanks everybody.

    @Matt_Shields , no it doesn't work when the face is not planar.

    @MDesign yes that is an approach I'm looking at.

    The @GregBrown videos are very useful, thank you @eric_pesty and @S1mon.

  • Matt_Shields
    Matt_Shields Member, Onshape Employees Posts: 980 EDU
    Answer ✓

    You definitely don't need a planar face to use Split Part.

    image.png
  • graham_lock
    graham_lock Member Posts: 276 PRO

    Thank you @Matt_Shields, you're absolutely right! Not sure where I was going wrong before!

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