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    Could the Inflatable Aircraft Concept Be Updated/Modernized?

    Sorry for not getting back sooner. If you search on Tensairity you'll find the development testing of various shapes. Apparently, the optimal shape is a cylinder that tapers drastically at each end. However, as was demonstrated in the Puenmagic design Tensairity can be used just as the wing's...
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    Question for the Chute Riggers...

    Toobuilder - You are correct about my misuse of quotes. I should not have snidely paraphrased your serious question, e.g. that you wanted to know about the safety of using the ancient Russian skydive gear that came with the L39 and if it could be checked or modified to work. My apologies. I...
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    Question for the Chute Riggers...

    Glad he had you. I Jumped a bit and cannot imagine leaving a plane and wondering if my gear would work. Perhaps I'm just a wimp but that seems nuts to me. Not a place to save money..
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    Question for the Chute Riggers...

    Aesquire - Thank you. Our experiences are more similar than you might think and I didn't mean to be harsh. I may have misunderstood your post with what seemed a casual response to malfunctions. I didn't start skydiving until the mid-eighties, probably 10 years into reliable squares, and did...
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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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