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    Boeing PETA pulse jet vertical takeoff

    ‪Boeing Pulse Jet Concept Video‬‏ - YouTube This could be big. REAL big. No moving parts. Structural part of aircraft. Light. Efficient. And, seems to me, applied in horizontal orientation, could be handy for very light homebuilt aircraft propulsion. Watch the video. Think it over...
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    Tensairity

    An inflatable wing using the principle of Tensairity These Swiss guys have a new take on inflatable wings. No, not a variation on the inflatable party noisemaker horn that you blow in and unrolls like a lizard's tongue, but rather one that uses a low pressure (~3 lbs./square inch) and...
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    Boxplane/boxwing basics

    Searching but not finding enough boxwing/boxplane information, I ask others knowledgeable to contribute their insights: Boxwing per Hoerner, Kroo, et al has much better induced drag characteristics than monoplane of equivalent span. Presumably, due to mutually reinforcing upper and lower...
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    PRSU related question

    Rather than divert the PRSU thread, I have a related question about stresses from power pulses: When a piston fires, there is a power pulse through the drive line*, accelerating in response to the pulse, then decelerating as the pulse fades. Out at the tip of especially a long propeller...
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    Ligeti Stratos

    The Ligeti Stratos joined/box wing aircraft seems worthy of more attention than it gets. Can we discuss this design? It is said to have a L/D of ~20:1. Its joined-wing configuration brings to mind some of the box-wing discussion noted in Hoerner's Fluid Dynamic Drag and Fluid Dynamic Lift...
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    sheet alu. skin over solid foam core?

    Anybody using sheet metal skin over solid foam core instead of ribs? I know the Cri Cri uses sheet metal bonded to ~1/2" Klegicell ribs, but how about over hotwired or block sanded solid foam core of, say, 2 lb./cubic foot density? This way, you'd get the smoothness and known strength of alu...
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    Vortex generator questions

    What airfoil (for an ultralight) works/responds best to VG application? In other words, if you were planning an ultralight aircraft with VGs incorporated into the design, what airfoil profile would be best suited?
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