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  1. R

    Why Jets fly high and propellers can't keep up

    Closer vehicle's propellant exhaust velocity is to vehicle's actual velocity closer it is to ideal where momentum sums to zero. Always figured jet ev being higher and massflow lower promotes a higher altitude with less air/lower drag for ideal operation.
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    Why battery-powered aircraft will never have significant range

    Lithium batteries at current state-of-the-art can easily keep a tank of diesel warm enough for a long time without needing giant piles of them; and one doesn't need crazy discharge currents to do it - so pretty safe even in cold temps. Which makes 2-cycle turbodiesel viable for the sky perhaps...
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    Why battery-powered aircraft will never have significant range

    In R-C world, there's really high-discharge graphene-substrate batteries for sale now. Power-density not much different than regular polymer though, and really expensive $/Ah.
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    Why battery-powered aircraft will never have significant range

    FAR103 regulations make electrics interesting possibility in that space. Electric motors have such a higher power density to weight makes them possibly competitive given fixed install weight of even tiny ICE engine. If FAR103 interpretations let electric plane count batteries as "fuel" up to...
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    search for original hanglider plans

    Haven't experienced this kind of thing myself, but I know a few old timers who won't touch Rogallo anything if it doesn't have a kingpost. Speaking of which, check out this little glider from UK -> Puma 13.5 | avianonline.co.uk Really innovative what they've done with the kingpost on that bird...
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    Full scale Pitcheron control Sailplane.

    More robust ATOS VR190 or some-such needed for trikes. The stock ATOS foot-launchers top out ~140kg hook-in all up I think.
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    Full scale Pitcheron control Sailplane.

    That's cool link. I had thought of bolting a Silent pod onto a Swift, but apparently someone else has done so. They show in the video the Swift-Silent pace on by the ATOS VX-Silent a couple times. I wonder which would win a gliding "race" - that Swift-Silent or a Silent Pod on a ATOS VR190...
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    spec list of efficient light planes

    Aerola Alatus AL-12M Aeriane/Icaro e-Swift Alisport Silent 2 Electro A.I.R. ATOS Wing (certifying) A.I.R. ATOS VX/VR Silent Glider All electric, primary-gliders. Energy-efficient by nature.
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    Announcing SoFIS - An Open Source EFIS

    That is a great question. A vario + ADI + attitude HUD in a glider would be awesome. It also something one doesn't have to build entire instrument for - just have to render output from some already-existing instrument onto a new display.
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    Announcing SoFIS - An Open Source EFIS

    Yeah there's good anecdote-type stuff consumer-com and chips hold up well down under the Van Allen belts just from all the personal gizmos astronauts bring, at least on astronaut mission timescales. Interplanetary space nastier. Mars surface itself not much of an upgrade radiation-wise either...
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    Announcing SoFIS - An Open Source EFIS

    Not sure on exact details, but there are chip designs that get custom-fabbed for exceptionally demanding environments - think outer space. Cosmic rays are zappers at silicon level; old process (bigger band gaps) is actually not a bad thing in that scenario, and there's some fab magic I'm not...
  12. R

    Could the Inflatable Aircraft Concept Be Updated/Modernized?

    What you're describing is pretty close to this thing -> https://www.delta-club-82.com/bible/292-hang-glider-woopy-fly.htm There is compadre setup to Woopy Fly called Woopy Jump, and I know that thing definitely uses compressors for active inflation management. Its a wing built like a...
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    Could the Inflatable Aircraft Concept Be Updated/Modernized?

    The SpaceX Starship boosters use Atlas "balloon-tank" scheme today, and they use the same material even - stainless steel. Yup, old Atlases look like stainless steel because they are. There is apocryphal story of Werner von Braun himself not believing such a scheme feasible, and Bussart (Atlas...
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    Electric Self Launch Options

    Yeah that's interesting stuff; I had read through those previously and was pretty happy about particulars in how active-gadgetry like slats etc. can count towards stall req. and the (really interesting) latitude about artificial governors to control level speed (vs. power or power/weight defs...
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    Electric Self Launch Options

    Just... I am affraid that FAA will not accept that. Part 103 means that you can operate the flying machine without pilot license. Can you imagine to fly without any experience with self launch electric glider like GP11e? GP11e has wing area 7,4 m2 and MTOM from 256 kg. No flaps, just ailerons...
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    Electric Self Launch Options

    First-time poster here and really interested in Part 103 e-gliders. Something missing in all the discussions about powered level speed compliance with Part 103 is that the vehicle must also have a power-off stall-speed of 24kts, and there is mucho fog on how battery-weight counts in on the...
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