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Thread: What are those twirelly things on top of commercial trucks?

  1. #1

    What are those twirelly things on top of commercial trucks?

    I have seen these devices on commercial and city trucks for a while. Theu are the black windmill like theings that sit on top of trucks to pick up the wind and they twirel around. ( black, sits flat on horizontaly on top of truck, about 5" in diameter ) I can only guess that it is a device to see if the vehicle is moving or not.
    Does anyone know what these devices are?

  2. #2
    Psychiatric help, 5 cents
    Join Date
    Mar 2005
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    384
    Quote Originally Posted by J. Peterman
    I have seen these devices on commercial and city trucks for a while. Theu are the black windmill like theings that sit on top of trucks to pick up the wind and they twirel around. ( black, sits flat on horizontaly on top of truck, about 5" in diameter ) I can only guess that it is a device to see if the vehicle is moving or not.
    Does anyone know what these devices are?
    I would assume that they are vents, the same as a turbine on a roof but on a smaller scale.
    I pulled into Nazareth, I was feelin' about half past dead...

  3. #3
    i am guessing self-cooling system... some trains actually use them.

    It cools itself because it moves at high speed, but the wind itself is not enough on its own. It usually have a liquid cooling system as well.

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