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Arash

Bruce Edgar Tractrix horn project

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actually I calculated a cf190hz Edgar style horn for a friend and thought maybe someone else is also interested to build such a horn so I'm sharing the plane here though it's not something very unknown to many of you:

 

 

40cm height to 80cm width ratio would be 1:2 not 1:1.5 :) besides you don't need a 80cm horn to get down to 190hz cf.  I calculated it for you with following details:

 

width to height ratio: 2:1

cuttoff freq.: 190hz

height of the horn: 35.69 cm

width of the horn: 71.395 cm

lenght of the horn (throat to mouth): 56.73 cm

 

you can download the Coreldraw file with 100% actual dimension: attachicon.gifcf190 plan.zip

a preview of what you'll find in Coreldraw file:

 

attachicon.gifcf190hz bruce edgar horn.png

 

feel free to ask me if you have any problem with file format or extension or whatever.

 

 

Any way you can share a .dwg file?

 

 

sure why not :)

.dwg version: cf190 plan.zip

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"Is this the case with all horns of this type?"

 

Pretty much so, you can get about a decade (10:1) before they start beaming on the top end.

 

If you want wide range without beaming, you will need to design a Constant Directivity type horn.

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I am still having problems opening this file, I down loaded the correct one to open it, but when it opens it is just blank??

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I am still having problems opening this file, I down loaded the correct one to open it, but when it opens it is just blank??

 

please let me know the exact version of Autocad or Coreldraw you are using and I'll come up with the right file format as soon as possible :)

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I am going to the autocad site and downloading the program to the free viewer. they send me a link to my email when it is finished downloading. when I go to the link I can not get any drawings??

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The autocad dwg that Arash has put here works. I got autocad and checked it. 

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I saved the corel file but haven't tried to open it in my illustrator yet.

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haven't tried to open it in my illustrator yet.
I had an older version of Corel Draw and it didn't like the cdr file. My Illustraor doesn't like it either (from CS 5).

 

Bruce

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haven't tried to open it in my illustrator yet.
I had an older version of Corel Draw and it didn't like the cdr file. My Illustraor doesn't like it either (from CS 5).

 

Bruce

 

 

I exported it with Coreldraw 9. all Coreldraw 9 and upper should be able to open it. hope that helps

cf190 plan ver9.zip

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I can try it on v. 11 at work... Thanks

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1 hour ago, Marvel said:

33

s-l1000.jpg

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Must have been... I don't even remember posting the above '33'

 

I was probably working on something else and the cursor was in the wrong window.

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