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    Vertical tail volume coefficients - what am I missing?

    The Archaeopteryx foot launched glider has a vertical stab that looks big in comparison to conventional gliders, I guess it is so that the tail boom can be shorter to allow launching without the tail hitting the hill. Grimace, if you are still watching this thread I would like to see some...
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    Easy Riser for X-plane

    Thanks Peter A question on the airfoil, how does Planemaker use the airfoil to calculate the aerodynamics. Did you copy the shape from the image at 3:58 in your video and draw the 3d model using that shape or do you have to make .dat file for it. I understand that it is based on an Eiffel...
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    modern equivalent to doped canvas?

    Good summary here, im just taking a tea break from building a stitch and glue double kayak. https://www.kayarchy.com/html/01equipment/009skinonframe.htm#skinonframematerials
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    modern equivalent to doped canvas?

    Ballistic Nylon is often used, its tough, see the video on the link below. http://www.kudzucraft.com/web/
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    Hi I whant to buy aircraft like this or aircraft no more than 70 kg

    Since they look like gum trees in the background I think it is a Wheeler/Skycraft Scout. https://en.wikipedia.org/wiki/Skycraft_Scout https://collection.maas.museum/object/35031
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    99lb/45kg primary glider

    Following this with interest, it reminds me of Mitjas thread of some years ago for an UL sailplane https://www.homebuiltairplanes.com/forums/threads/ul-sailplane-footlaunchable-foldable.11888/ As far as reducing frontal area drag the pilot could be more reclined like the Archaeoptryx or the...
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    Existing single cantilever tubular spar wing designs?

    I have a book called Gossamer Odyssey by Morton Grosser, the Condors tube structure was etched internally with swimming pool chlorine I think. By filling the tubes when vertical and the chemicals poured in at the top then the lower part of the tube was etched more than the top due to the length...
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    Real or doctored photo?

    The event recreated in DCS World simulator
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    Ultralight Biplanes

    Not conventional but a biplane and ultralight. https://en.wikipedia.org/wiki/UFM_Easy_Riser
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    Foot-Launch and the Klingberg wing MK II

    Been following the Klingberg wing Mk 2 videos with interest. After watching one of his recent videos where he had issues with leading edge fabrication, I suggested in the comments he should check out BoKu's puddlejumper thread using aluminum sheet as a form. Does X plane give an idea of the...
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    RoofTop Scale testing

    Hang glider certification uses truck top testing.
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    blanik L-13 glider, fowler flap

    Dug through some very old photos as I thought I had one of the Blanik flap unfortunately the photo only shows half of it but confirms it is a straight slot at least the forward section is. If your design is like the the BKB 1 will it have elevons like the Millenium or are is it going to it...
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    Issues and Solutions for kit- and plans-based sailplanes and motorgliders

    As someone who flew gliders then hang gliders in the 70s and 80s and recently soled in gliders again after 45 years I would love to see plans for something with a better performance than the Goat and a lot cheaper than the Archaeopteryx available. The design by UltraIajt on HBA , I think it...
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    UL SAILPLANE - Footlaunchable, foldable

    Maybe one day soon I hope. Mitja did you ever make a RC model of your Kanja design? If so i would like to see some photos.
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