xesy
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This would require some serious precision engineering and aero-dynamic experts to caculate the flow of air. I am pretty sure that it would be heavier, more inconvinient and unreliable than the traditional umbrella to carry around, plus it is more costly to purchase and maintain ( you either need to charge the battery regularly or replace it). Not to mention if the umbrella is not waterproofed properly, it can get broken in mid-use, causing a real problem.