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Grifone flying bird

Discussion in 'Free Flight' started by actaline, Nov 11, 2013.

  1. actaline

    actaline New Member

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    Thanks to te valuable help of experienced phlatobyz :good: here in the forum, I have been able to complete this free flying bird for the kids.
    The idea is to rely on a KFM4 airfoil to achieve good gliding performance. The smoother leading edge the better gliding.
    Material is 3mm depron/like sheet. The outline is a true one from a bird guide book, modified to allow cutting with a 3mm bit.
    Upper and lower profile differ as the upper covers the front feathers to avoid breaks. Hole in the body shapes is for one euro cent.
    Folding a bit outer feathers and the tail improves stability and gliding.

    grifone_top.JPG grifone_bottom.JPG
     

    Attached Files:

  2. 3DMON

    3DMON Moderator Staff Member

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    That came out nice. Good job!:good:
     
  3. rcav8r

    rcav8r Moderator Staff Member

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    Looks great. Where's the CG? Would make a nice conversion to R/C.
     
  4. actaline

    actaline New Member

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    CG for a KFM4 flying wing should be from 25% upward to eading edge, rougly 25% in this little bird
     
  5. rcav8r

    rcav8r Moderator Staff Member

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    Thanks... So the standard... just wasn't sure due to the unusual platform.
     
  6. actaline

    actaline New Member

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    profile update: it works fine even with a KFM2 wing profile, i.e. only top half wing. Just add weight to keep CG at right point, I have added one euro cent.
    So much easier for the kids to get a good shape leading edge
     

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