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Thread: Eliminating the Pacer's humpback look

  1. #11
    Rick-CAS's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    I did this to my project. You actually raise the stringer to get the hump out. Mine is up 2 1/2” at the rear.
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  2. #12
    wmvosburgh's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    Quote Originally Posted by Stephen View Post
    Is this a minor alteration, with a log book entry? Hmmmm.
    So what's the consensus from folks? Minor alteration or...? If you're looking to keep certification.
    Always though that reducing the hump would reduce the stubby look from a side profile.

  3. #13
    Administrator Steve Pierce's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    I'd leave it alone and spend my time on other aspects of completeing the project. They look fine to me and when you change one thing it has been my experience that it effects 2-3 other things.

  4. #14
    Stephen's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    Quote Originally Posted by wmvosburgh View Post
    So what's the consensus from folks? Minor alteration or...? If you're looking to keep certification.
    Always though that reducing the hump would reduce the stubby look from a side profile.
    Raising the Vee at the rear in my opinion is a minor alteration. This requires no structural changes.
    "You can only tie the record for flying low."

  5. #15

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    Default Re: Eliminating the Pacer's humpback look

    Generally any changes to the outer mold line are major alterations.


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  6. #16
    Stephen's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    Quote Originally Posted by dgapilot View Post
    Generally any changes to the outer mold line are major alterations.


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    Explain. "Changes to the outer mold". This differs from my understanding.
    "You can only tie the record for flying low."

  7. #17

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    Default Re: Eliminating the Pacer's humpback look

    Part 1.1 major Alterations . . . Appreciably affect flight characteristics.

    Part 43 Appendix A (a)(1)(iii) fuselage

    AFS-300 job aid (D)(4) changes in basic dimension or aerodynamic contour . . .

    AC 43-210a figure 3-2 “could the alteration or repair have an appreciable affect on . . . Flight characteristics”


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  8. #18
    Stephen's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    Quote Originally Posted by dgapilot View Post
    Part 1.1 major Alterations . . . Appreciably affect flight characteristics.

    Part 43 Appendix A (a)(1)(iii) fuselage

    AFS-300 job aid (D)(4) changes in basic dimension or aerodynamic contour . . .

    AC 43-210a figure 3-2 “could the alteration or repair have an appreciable affect on . . . Flight characteristics”


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    I don't see how changing the height of a "non-structural" fuselage stringer and inch or so, "appreciably affects flight characteristics". I can believe some IA's interpreting differently.
    "You can only tie the record for flying low."

  9. #19
    andya's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    Have to believe that if a field approval were needed, there would be a split in the opinions
    of PMI's
    "Progress is our most important problem"

  10. #20
    cook11's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    What are your thoughts on tapering the fuselage by decreasing how far the side stringers stick out on the sides? My Pacer is experimental so I do not require STC's or 337's. This is an extreme alteration....

    P1.jpgP2.jpg

    I'd be curious to know how this Pacer flies......

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