# port conversion, flared to straight

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

1. ### 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 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 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 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 Second Unit

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here is the
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 Moderator Moderator

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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).

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