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Raindrops have a terminal velocity of 10-20mph. So, if you
are driving at (say) 50mph, they will be hitting your
windscreen at a shallow angle, not from above. |
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It might be more effective to have a blower along the bottom
of the screen, to deflect raindrops up and over the car. |
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See attached link, which contains a very Halfbakeryesque quote: "The obvious way of doing it is to have an ultrasonic transducer in the corner of the windscreen that would excite waves at around 30kHz to bounce across the windscreen" |
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What's a vacuum blower? Isn't a vacuum more of a sucker? |
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Ultrasound to keep the rain off has been proposed many
times (er... citation needed...), but no-one has been able to
get it to work effectively on a car (works on a fighter plane
because they go a lot faster). |
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How about a transparent flexible loop that is constantly
sliding across the surface of the windscreen. The return path
of the loop is cleverly hidden in the roof of the car. There is a
single stationary wiper on the side that scrapes the water off
as the loop passes it. |
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If you can't change the speed, change the materials so they act like they are going fast. This would involve yet another film on the windscreen. |
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in ships they have a rotating glass window that clears the
water from the waves away. |
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// How about a transparent flexible loop that is constantly
sliding across the surface of the windscreen. The return
path of the loop is cleverly hidden in the roof of the car.
There is a single stationary wiper on the side that scrapes
the water off as the loop passes it. // |
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Reminds me of my idea to keep snow off of solar panels. I
don't remember if I ever posted that. If not, I should, but I
don't think it's on my list. I'll check. |
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Edit: I haven't posted it, but it turns out to be on my list
already, so I'll post it someday. |
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//waves at around 30kHz to bounce across the windscreen// |
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Of course, those words were (probably) not composed by
anyone here, but I'm wondering whether they are meant to imply
an in-and-out vibration, as of a drumskin, or a side-to-side
vibration, as when one checks the unstiction of a frying pan
before attempting a pancake flip. |
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In either case, would the purpose be merely to break surface
tension so that gravity could do its work, or to fling water clear
into the void by nothing but the energy of vibration? |
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//nothing but the energy of vibration// Really? or a layer on/close to the windscreen. |
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