Recent content by flyboy2160

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    front wheel steering fork angle

    My FEA analyses of the old, skinny Vans Wittman nose legs showed them buckling even without the edge of the caster fitting digging in. Check out the Antisplat compression test video: Videos | Anti Splat Aero LLC
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    Perimeter of airfoil

    The method depends on what tools you have and know how to use. IF you have the equation of the airfoil, AND IF you can use calculus or a numerical method, you can use those to get the length. IF you have a CAD system, you can build the shape and just query the perimeter. (As always, sanity...
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    Raptor Composite Aircraft

    By spreading out the force over a larger area, that larger area is acting like a larger spring that is more difficult to deform. It's the same principle as snow shoes. It's stupidly inefficient, but it theoretically could work. But its even worse: Peter The Great based his claim that "1/4" thick...
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    Boeing - Design Issues...

    Proving "all" is an impossible task. But after life at 4 big aerospace companies, I'd agree that Robert Brown's comments are increasingly common once the crusty, old, technically good engineering managers of the early 90s started getting replaced with PC MBA stooges who had never actually been...
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    Raptor Composite Aircraft

    The aileron isn't free to rotate in yaw or in roll - it only rotates in pitch. Per FAR 23, the counterbalance support must be good for 24G vertical, 12G side to side and aft, and have a fundamental frequency 50% greater than the control surface.
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    Raptor Composite Aircraft

    I agree. But the flutter expert who helped with the analysis of my plane claimed that there could be aerodynamic flutter coupling between control surfaces, especially if they were unbalanced, and the rigid body modes of vibration of the entire plane. These rigid body modes - 3 translations and...
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    Boeing - Design Issues...

    Yes! I've also seen this a-plenty at Northrop, Boeing, Lockmart, and Raytheon. It seems as though their career goal is manglement, not engineering. As an engineer who passionately loves engineering, I hate and despise them.
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    Boeing - Design Issues...

    This article seems to me one of the best summaries of The Change. I was at the wide body plant in Everett in the mid-late 90s when Stonecipher went on the warpath against the traditional Boeing ways, eventually resulting in MBA know-nothings in charge instead of real engineers. It never fails to...
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    Boeing - Design Issues...

    I read the Lion Air report cited above. The piling on Boeing is being done by people justifying a previous prejudice, not based on the facts. The performance of the previous flight crews in not reporting their treatment of runaway stab and the shoddy lack of proper testing and lying by the...
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    Boeing - Design Issues...

    V, can you give an example or two, or do we have to re-investigate it? Thanks.
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    Boeing - Design Issues...

    The method used by the private company, Underwriters Laboratory (UL), that certifies and labels many consumer electronic products: they realize that they will be out of business if they are corrupt because their label would mean nothing. (I went through getting UL approval for a consumer...
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    Boeing - Design Issues...

    We'll just have to agree to disagree. What I see as workable is a private, consumer advisory rating service that lists the safety records, training, and maintenance requirements of airlines in a manner that's digestible to the flying public.
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    Boeing - Design Issues...

    davidb, I have applauded your astute comments on this issue, save this one. It's unworkable. Who sets the standard? Some global commission? The UN? It would be FUBAR from the get go. It's not needed. For too long technically illiterate flying customers just assumed 'somebody is taking care of...
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    Boeing - Design Issues...

    ...except you saved the really juicy stuff somehow (Find A Way!) just in case you got caught in the wringer.....
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    New life for Stratolaunch?

    Ok, Ok, it is the Verge, but https://www.theverge.com/2019/10/11/18647835/stratolaunch-paul-allen-biggest-plane-air-launch-vulcan-inc
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