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Recent content by flyboy2160

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    Raptor Composite Aircraft

    Jet, I've been with you all the way until this damping deal. (LOLOLOLOL like the scene in Top Gun in which Jester says ~ 'That's some of the best flying so far, right up to the point where you got killed.') Uh, uh, my school daze recollection is that you're not going to get much damping in a...
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    Raptor Composite Aircraft

    Yeay! Somebody finally said it! Intake plenums are your friends! Those F1 guys know what they are doing with radiator plenums.
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    Raptor Composite Aircraft

    No, you can't tell from his CFD photos which SW software he used. Flosim plots have the same legend arrangement. (I have fired up Cosmosflo and looked at samples, but I haven't actually run models with it.)
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    Raptor Composite Aircraft

    lololol You're lucky you didn't use a phone booth as the analogy, because you'd then be wrong:
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    Raptor Composite Aircraft

    Solidworks has two versions of CFD software: a simple one that is free (CosmosFlow?) with the mechanical seat and an expensive one called Flowsim (which is actually a product called Nika/FloEFD.) If you guys are dissing the free version, I can't argue because I've never used it. However, I...
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    Where does one find an aerospace Engineer to hire

    Cheers MAC! LOLOL For others considering using Report 45: it isn't as easy as it is to say 'use it.' You need the modal frequencies and, if I remember correctly, the rudder/vertical cp. If you're already that far pregnant, you may as well run a Nastran flutter analysis.
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    Aeolus-Aerodynamic Analysis and Optimization

    Uh.....Uh....the last time I checked, VSP didn't do any aero analysis, it just let you doodle a configuration that could be analyzed by something else. That Aeolus looks neat-right up to the point where you need the fuselage. The pitching effects of a fuselage and canopy shape like an RV8 or...
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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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