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  1. R

    Part103 in every way but does not meet stall speed? Thoughts?

    I also ran the numbers from the FAA circular released in 1984 that uses aircraft parameters to see if the design meets Part 103. Sadly it still comes up with a speed of 26kts. This is a two-track question. For an individual private operator and/or especially builder you'd be fine barring doing...
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    Extreme High Altitude STOL Aircraft for Everest Ascent

    A Grumman Lunar Lander could get from base to the top no problem. And at least the ascent stage would, paradoxically, get you back down.
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    Extreme High Altitude STOL Aircraft for Everest Ascent

    Magically turning gravity-dial down 62% helps too.
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    What do you think about "e-soaring"?

    Aspect ratio, wingloading, and drag. Higher, heavier, lower = better glider specs - not necessarily a better glider lol. For sub 120kg though those parameters add up to effective speed-limit. The ~50:1 18 meter Lange supership kind of sailplanes are half-ton at takeoff flying 40kg/m dry and...
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    New electric project

    If you want that particular e-glider it is for sale -> https://www.barnstormers.com/classified-1605644-Electric-Glider-Conversion.html?catid=19439 It was for sale on wingsandwheels last summer for about double that - but nobody knew about a dead battery yet.
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    What do you think about "e-soaring"?

    I recall the GoFly project and the electric-gear wheels and thinking then there's a disruptive invention possible combining e-cycle uniwheel tech like on this -> King Song S18, 1110Wh Battery/2200W Motor, Suspension - with a paraglider. You'd have to figure out some anthropomorphic getup to...
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    Weight Shift Trike recommendations

    Not all trikes use weight-shift per se; A.I.R. ATOS wings use spoilerons actuated via a-frame. They also have flaps, and can even be had with air-brakes. They also work with trikes, these being nicest ones I'm aware of -> https://ultralightdesign.cz/advanced-pilot/ I am scheming an...
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    Rocket-powered ultralight (self-launching glider)?

    Interesting. Among many abortive concepts by Gary Hudson for SSTO's was the HMX Roton. Same kind of deal using tip-rockets; the rotors worked like the turbopump in a conventional booster, it would fly to orbit and then rotor would also be a re-entry airfoil, slowly 'blooming' while autorotating...
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    Rocket-powered ultralight (self-launching glider)?

    Been thinking about reaction-motor gimmicks off and on this past week, what one could do in FAR103 specifically. Microturbines, the bigger primo RC and UAV ones, are in the ballpark. They're ruinously expensive and finicky and unreliable. At their scale there's same surface-area/volume problems...
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    Rocket-powered ultralight (self-launching glider)?

    FAR103 wouldn't be particularly fun for rockets with the propellant mass restrictions, but looking at LSA category thats actually pretty interesting range of possibilities from just the weights. 100kg of payload + 300kg of vehicle + 200kg of propellants = 600kg MTOW. 200kg x 250 isp engine =...
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    Eviation Alice

    Yeah those weird Piaggio twin shaft ones with the canards have tiny wings on them as well. They've gotta be heavy on the wings. That's definitely the class of airplane the Alice slots right into.
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    Eviation Alice

    That's cool link. 26 square meters ~7500kg = ~280kg/meter. Its not fighter-plane but definitely far into jets. Being electric airplane with 8000kg MTOW guessing 7500 pretty typical. And its always that heavy.
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    Eviation Alice

    I have to admit I think you could build a spar that'd hold that plane up mechanically in the volume of that wing no problem. But you got me thinking about wing loading reading your comment and I get ~400kgs/m(!) just spotting that Alice 20 squares (generous mark-one eyeball guestimate). That...
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    Eviation Alice

    Its an always heavy (8T mtow) airplane, has club class glider-sized wing in aspect and span, and no fuel tanks or gears or anything in the wing. So it'd kind of be an overbuilt sailplane wing (guess) trying to hold up a (known) fat airplane. There should be some flex.
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    Eviation Alice

    If one selects the 'magni650 EPU' from whats listed here: magniX to their credit they front specs, and I believe this essentially is the system sitting in that Alice's nacelles. 200kg for ballpark 750hp is right inline with a roughly equivalent turboshaft. Interesting the package consists of...
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