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Based on the effects on my
Based on the effects on my coasting car as a semi-truck slowly passes me, I get a slight reduction in drag when the front of the truck is just behind my car in the adjacent lane, but there is a significant increase in drag as the truck is running alongside me, and then there is a noticable drag reduction as the rear of the truck pulls ahead of the front of my car.
The heat associated with an aircraft's pitot tube is to prevent ice from forming on and clogging the tube while flying in icing conditions. Typically there is a switch in the cockpit that turns on the pitot heat.
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basjoos 
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