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I doubt that door handle contribites anything measurable to the aerodynamics of the car. The truth is that musk thinks it looks cool regardless of how annoying it is if anything goes wrong.
I found a 12% figure. Aerodynamics are a primary driver of range, which is a major ev selling point. A 12% drag decrease is huge, because you can carry less battery which means you can have a smaller motor, lighter frame, leading to even more range. So it would be very important if that is true.
https://www.businesswire.com/news/home/20180105005468/en/Top-3-Drivers-of-the-Global-Automotive-Retractable-Door-Handle-System-Market-Technavio
You can still have protrutionless handles without making them electronically retractable. Just have a spring-loaded metal flap that you push in with your hand
You'll still get the icing issues, where you need to be able to get in even with a thick layer of ice over the handle. But that does sound like a really good solution otherwise.
I find it hard to believe that 4 door handles (being made flush with the door), reduces drag by 12% . Are there other articles you can share?
That's just what Google came up with, sorry. I don't have time to research more right now. I do know a rear view mirror on an f350 has more drag than an entire Tesla, so aerodynamics are not always intuitive.
That's a plausible claim. If you find it hard to believe, maybe you should go back to the wind tunnel.