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no cause there is no use for them

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There's plenty of use for them--most planes have window wipers--but a fighter jet doesn't have them because the wind would tear them off, and because the wiper couldn't go around the curve on the canopy. The canopies have a coating that repels water, like RainX does for cars.

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Actually, most planes do not have wipers. The larger commercial passenger jets that most people know DO have them, but they are only used during taxi.

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Many turbine aircraft duct compressor bleed air to 'blow' off the windshield.

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13y ago

What else can I help you with?