My apologies for not looking at all your concepts before asking my questions; to an extent you have answered some of them already in your concepts.
One of your concepts states 12.5kW from 24m² of ~50% efficient solar-panels which sounds a little high to me. (I always remember the figure of 1kW per m² under ideal conditions, ideal conditions!) So there I think is your first problem (and the reason that there are no solar-powered cars)!
To put this in context, last year Volkswagen launched an experimental all-electric Golf (e-Golf); it was powered by a single 85kW (114 horsepower!) electric motor. To power this with 50% efficient solar-panels under ideal conditions would require a solar-panel area 4 metres wide by over 40 metres long; how do you fit that on a VW Golf? And this 85kW e-Golf does not have to fly.
So are you saying that the total area of your aircraft can be covered in ~50% efficient solar panels given that it must also be extremely efficient aerodynamically and function as an aircraft?
Your total ideal power, even at ~50% efficiency, is only just sufficient to run one of your two 10kW motors (even assuming a 100% efficient motor) so you have been forced to add (heavy) auxiliary batteries.
Another problem I foresee are the propellers; a propeller that will be even remotely efficient at zero altitude and also at 20,000 metres will surely be highly compromised at most altitudes and speeds (especially if it is fixed pitch). That will waste much of your solar-power; solar-power that you just do not have to start with.
Can you find me any aircraft that has ever flown with only sixteen horsepower; what were its performance figures like? Could it get three crew to 65,000 feet?
Nobody can stop you dreaming but people only invest in reality; good luck! 🙂
I think only one can fly to 65-120 000 ft.
Below are the options with more span.
Human powered aeropanes fly at 0.28 kW constantly. Ten times less power / kg.
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