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    Question for the Chute Riggers...

    Wow.. Am I understanding correctly that you can afford to fly an L-39 and you are "wondering if you should chance using it's original parachutes?.." Sorry, but that's freakin' nuts. It was pointed out that Strong makes a replacement, please get one. And you other guys jumping T-10's and...
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    Could the Inflatable Aircraft Concept Be Updated/Modernized?

    Also, Tensarity beams develop useful stiffness at relatively low pressures, 6-10 psig, and exhibit increased stiffness with increasing pressure to a point. Since leak rate varies directly for any given envelope with pressure differential Tensairty structures can be built to have very low...
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    Could the Inflatable Aircraft Concept Be Updated/Modernized?

    Thought I would jump in here to clarify. "Tensarity" is not just an inflated thing. Rather, in it's simplest beam form, it is a composite structure that uses compressive elements attached to top surface of an inflated cylinder and tensile elements, (originally just steel cables), that attach...
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    Prop shaft

    I had a 63' Lemans on entitle with that "torque tube". It had 4 wheel independent suspension as well. I wish they'd continued refining that chasis for another 10 years it would have been a keeper. Different times - I think the 64' was changed considerably and rebadged as "GTO". Also fun...
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    Scale ME-262

    lots of DC-3's still dragging happy skydivers to altitude as well! Way fun to run down the isle, out that little door and then fall on your back watching the big bird pull away..
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    10/23 Raptor Video

    They must be a blast to fly once one allocates to it and I know the original engines caused much grief. Like most everyone on this forum I wanted one from the start.. I in no way meant to imply that PM should try to use such tech. The thread had departed into a more general discussion of LE...
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    10/23 Raptor Video

    On the LE cooling tangent of this thread - Significant structural improvements have been made to graphite foams which exhibit remarkable heat transfer, (e.g. POCO HTC). Additionally, much research has demonstrated the efficacy of active circulation control on wings and ducts from the venting of...
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    10/23 Raptor Video

    Thank you for providing the materials info. It's always surprising to me how few people know of Teflon's infinite creep characteristic. Even plumbers think that "Teflon tape" is for sealing pipe threads - it cannot seal anything at the remarkable pressures developed between tapered threads...
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    10/23 Raptor Video

    ...And doesn't the BD-5 hold the record for # of crashes/total # of flying airframes?.. I don't recall the actual stats but I remember being horribly surprised.
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    Where does one find an aerospace Engineer to hire

    Yes, but he doesn't charge as much now... :)
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    Mass Balance of Ailerons

    Great discussion and explanations and beautiful RV. Two things; 1) I'd like to hear what your performance goals for the tapered wing design on your RV were and how they perform relative to those goals and; 2) Given that flutter is such a complicated and viciously dangerous phenomena and...
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    The A-4 Skyhawk

    YH - Someone, (RFB) Did! The RFB Fantainer was to be a "cost effective" Jet Trainer. The initial prototype didn't work well but the two subsequent versions received exceptional marks for giving a "Jet like" flying experience @ 1/5th the cost of the Cessna T-37 Tweet and using 1/10th the fuel...
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    10/23 Raptor Video

    Thank you for the excellent video on liquid cooling duct design. Clear and concise and a great review of basic fluid flow and the inherent challenges and compromises inherent in any duct design. I imagine that results from recent studies exploring the use of shaped "turning" vanes using CFD...
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    The A-4 Skyhawk

    Fun discussion and great nostalgic video- Thanks. A question - It seems to me that the Viper Jet is a good example of the diminishing returns of down-scaling performance Jet Aircraft. Even their greatly improved MK2 version with stellar performance and (as reported) great overall handling is...
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    Comparison of 4130 and 2024 Tubing, Composite Tubes too.

    I'm sorry to mislead you. You guys are right - I Screwed up and quoted a paper on aerospace material use without verifying it. Not sure what it was referring to and now I'm not finding the reference. Specific strengths of various materials, (kN*m/kg) 7075 - 204 6061 - 115 4130 - 71-85 Not...
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    Hybrid or electric theory?

    Drop it from an airplane...
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    Comparison of 4130 and 2024 Tubing, Composite Tubes too.

    Honestly, the scope of the analysis is well beyond my remaining skills as well. I only bring up Mohr's circle because ultimately, outside of buckling failures that have been properly highlighted in the thread, isotropic materials fail in the planes of "Principle" stress which must be determined...
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    Comparison of 4130 and 2024 Tubing, Composite Tubes too.

    All of your efforts on these spreadsheet solutions are amazing. I struggle to remember half of the things you're working out but the review has been really entertaining -Thanks. One thing that I vaguely recall, (Also from Shigley..), that could be added into your efforts is that the various...
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    Is wearing a personal chute with a bail-out system acceptably safe compared to an airframe chute?

    in2flight has a great attitude and knowledge base - Please follow his advice and if he were local I would love to learn from him. I'll add a couple of other perceptions from my far less comprehensive experience. In the late 1980's I took up sport skydiving (the kind where you're not carrying...