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Thread: Eliminating the Pacer's humpback look

  1. #21

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    Default Re: Eliminating the Pacer's humpback look

    Quote Originally Posted by Stephen View Post
    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.
    It is the installer that has the responsibility to make the minor/major determination. Likewise it it the next IA that has to sign that the Aircraft is Airworthy (1. Meets type design or properly altered state. 2. Is in condition for safe flight). As an IA, if the outer mold line is changed without a supporting 337, I would not sign an Airworthy annual. Just my opinion, but backed by about 50 years experience. You would be surprised what aerodynamic effects small changes can make.


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  2. #22

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    Default Re: Eliminating the Pacer's humpback look

    Don’t get me wrong, if I were doing a Pacer, I’d do a lot of Younkin’s mods, including eliminating the hump. I’d just have paper to cover them.


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  3. #23
    cook11's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    Is there a rule of thumb on how far the side and bottom fuselage stringers should be from the fuselage tubing? I just got my aluminum stringer extrusion from Univair yesterday and I would like to start installing it.


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  4. #24

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    Default Re: Eliminating the Pacer's humpback look

    How about what is shown on the fuselage assembly drawing, since that is part of the “Type Design”


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  5. #25
    cook11's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    I cannot seem to find dimensions on the drawings disc I have. Is there a drawing reference # that shows what the dimensions should be?

    Thanks!

  6. #26
    Stephen's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    If the stand offs are still on, use them as your guide. On the bottom, I'll check but, if I remember correctly they attach directly to the frame. Or, find a plane you can look at. The drawings are a challenge to decipher sometimes.
    "You can only tie the record for flying low."

  7. #27
    Administrator Steve Pierce's Avatar
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    Default Re: Eliminating the Pacer's humpback look

    There is the fuselage tubing drawing with general dimensions and there is a fitting drawing which shows dimensions on things welded to the frame.

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