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Old 8th February 2004, 10:38 PM   #1
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Default How to fold a TQWP?

Hi

I´ve just got data form MJK worksheets for a ML TQWP and the first graphics are pretty much satisfying. Resulting line lenght is 72 in., So= 0.5 and Sl= 3Sd, driver offset is 0.5. Driver is a Vifa PL18

My doubt is how to draw a folded line and how to get the effective lenght in the area the line folds behind the woofer?

My box project is similar to this one found in fellow Jim Read pages:

http://www.jrbham.btinternet.co.uk/tqwp/index.html

In advance thanks for comments

JC
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Old 8th February 2004, 11:38 PM   #2
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Here is a design example...

http://www.t-linespeakers.org/FALL/bipolar/index.html

and i believe Bob Brines has a folded & non-folded vesion of his 1354 ML-TQWT (link on the page above)

dave
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Old 9th February 2004, 10:04 AM   #3
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Hi Dave

Yes, this is a good example. Regarding the blue drawing, the LINE LENGHT "path" starts in the midle of small section and follows all trough the increasing section up to midle of large section?

And in this example offset is near 0.5?

Bob has deleted the folded TQWP from his page.

TIA, JC
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Old 9th February 2004, 02:27 PM   #4
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Nope, it's still there. Go to my site http://www.geocities.com/rbrines1/ and click on "Straight Pipe" in the left hand column. The folded version is at the bottom of the page.

Bob
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Old 9th February 2004, 04:18 PM   #5
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Hi Bob

OK, that´s fine. Now, how did you get the inner dimensions of the folded version to result 60 in. from the Straight Pipe.

There´s a straigh 30in. segment (botton to woofer), plus R5 and 22.5in. to the throat.

Then, 30 + (2.5*pi) + 22.5 = 60.35.

Sorry being so primary. I´m in novice ranking. Please correct me

TIA
JC
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Old 9th February 2004, 05:13 PM   #6
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Quote:
Originally posted by JC Fardo
Regarding the blue drawing, the LINE LENGHT "path" starts in the midle of small section and follows all trough the increasing section up to midle of large section?

And in this example offset is near 0.5?
Yes.

The driver is exactly at 0.5... middle of the fold.

dave
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