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Yes. You don't even need concrete or black paint, just a plowed field will do, or grass vs forest, a south facing slope... (Ask anyone who's done much sailplane flying.) How high the convection will reach depends on a lot of factors. Hereabouts (east side of the Sierra Nevada) you can easily thermal to 14,000 ft (~4500 m) or more. (Going higher requires ...


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In principle: yes. But i won't give exact numbers for a mere kmĀ², though i'd expect a skilled paraglider under optimal atmopsheric conditions to be able to make some use of it ;-) Actually, gliders use industrialized areas exactly because of this, a low albedo created by asphalt, concrete, dense construction/building. How high and strong the resulting ...


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