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fan shrouds


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  • fan shrouds

    is there a performance purpose for the fan shrouds? (to create proper air flow)

    or is it child-proofing? (to keep the chasers & I from oopsing my finger)

  • #2
    Re: fan shrouds

    guess i could have added. . .for national motors?


    • #3
      Re: fan shrouds

      I believe they do direct the airflow... the air comes in through the center if the shroud, at the very backs of the fan blades, and through the motion of the blades, it is forced through the motor case and out the vents at the top. If you didn't have the shroud, the blades would just act like a blender and stir the air around in the bottom of the motor, but wouldn't generate any pressure to move it through the case.

      If it was a matter of protecting your fingers, they would have put screens at the top vents where the centrifugal mechanism runs... they're big enough to get your finger in next to those moving parts and live power...
      <span style="font-style: italic">Educatio est omnium efficacissima forma rebellionis</span>


      • #4
        Re: fan shrouds

        yeah i guess thats true. i know that with westinghouse there's no vent hole in the back and no shroud and there's a hurricane coming out of the top. hmmm, maybe i just heard myself...LOL

        but with the pit motors, there's really no vent holes in the front, where is all that air suppose to go?. AMF Magic Triangle, could you help me out please?!?


        • #5
          Re: fan shrouds

          Yes, the open area around the output shaft is where air enters the motor. It gets sucked in by the blades and is pushed toward the outter edge of the frame.
          Some of the air is expelled through the little holes in the sides of the adaptor and frame, but most of it has nowhere else to go but up, so it hangs a right and is pushed up through the stator and rotor, eventually exiting through the openings in the end bell.

          In the new Vantage catalog that will be coming out in the next month or two, you will see the changes I've made to the National BE replacement and to the "New Vantage" BE motor/gearbox.
          The old Vantage design for motor/gearbox adaptors didn't allow air to enter the motor where it should, and they run hot as a result.

          I too worry about safety. I know sooner or later some doofus will stick a finger in the adaptor with the motor running and pull back a bloody stump.
          The New Vantage motor/gearbox does not allow you to get your finger in there unless you've got really small fingers.
          And, right below the motor, you've got that weldment housing turning, just saying, "C'mon, stick your finger here! I'm hungry!"

          Net result: keep hands away from gearbox when it has power.



          • #6
            Re: fan shrouds

            thx magic

            i found out thru trial and error today. without the shroud, the air gets pushed out the rear (pit motor)and at the front there's no air movement, motor ran hot. so i put the shroud in and man what a difference. air got sucked in the rear and plenty of flow out the front. . .ahhhhh. . .i felt much better


            • #7
              Re: fan shrouds

              i noticed the national BE from Vantage. $264 caught my eye. look forward to the new catalog


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