port conversion, flared to straight

Discussion in 'Archived Threads 2001-2004' started by Kevin Beck, Jun 14, 2002.

  1. Kevin Beck

    Kevin Beck Stunt Coordinator

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    Doing a little test, and don't remember how to convert the flared port length, to a port without the flare. I need this fast if anybody knows. If I remeber right, the flared ports add an inch to the overall length needed. So to go back to a straight port, would you subtract an inch? Say Adire uses a five inch center section, capped off with the flares. What would be the equivelant straight port?
    Thanks guys,...>>>--->
     
  2. Jeff Rosz

    Jeff Rosz Second Unit

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    if there are flares at both ends, then subtract 1". if there is only a flare on the baffle end, subtract 1/2".
     
  3. Kevin Beck

    Kevin Beck Stunt Coordinator

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    Jeff,.
    So if a recomendation is to have a 9" center, and two flares. A regular port would just be the 9" tube. Is this right?
    Thanks,...>>>--->
     
  4. Jason Hammerly

    Jason Hammerly Supporting Actor

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    No ... if it says to use a flared port with a 9" center, you add 5" to the center length on the flared port to get the non-flared port length. That would make it a 14" non-flared port.
     
  5. Jeff Rosz

    Jeff Rosz Second Unit

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    here is the
    link to adire's paper on the subject.
    according to adire's tech paper...
    the center piece should be 5" shorter than the calculated vent, so for the 9" center piece...in reverse 9"+5"=14" required vent.
    for the 5" center it would be 10".
    or you can give the Vb and Fb and i'll punch the numbers for a straight port.
     
  6. Patrick Sun

    Patrick Sun Studio Mogul

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    Just focus on the end-to-end length for either a straight or flared port.

    If the calculations call for a 12" straight port, simply add one inch to the require end-to-end length for a flared port (i.e. 13" from end-to-end, just do some simple arithmetic to arrive at the final length once you measure the length of the flares).
     
  7. Kevin Beck

    Kevin Beck Stunt Coordinator

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    Thanks guys,..Some how I did't see the info on the ports. I was looking in the wrong place. Got it on paper now.
    Thanks,...>>>--->
     

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