And Now For Something REALLY BIG

[Pano]

Originally Posted by GM

If starting with one that's already a horn, then clear the S1, etc. fields to begin anew.

That is what I've tried to do, again and again, with no luck. I think it's the "etc." part that I'm getting wrong.
Any way you can post a screen shot of the fields filled in before you hit the calculate button?

[Pano]

Ah ha! I think I've got it. Got Hornresp to calculate an exponential horn of 400mm length, mouth 160mm wide, throat 20mm wide. Seems to match pretty well with what I measured.
Just guessing on the throat size, but it is probably close.

XLS file included below. First two columns on the left are the important data.

[JRKO]

Thanks Pano!

Heres a chart showing the nice exponential curve those figures give.

I'll start on the former tomorrow and maybe get some parts cut'n'stuck

EDIT: THIS IS WRONG PLEASE SEE POST 716 FOR CORRECTED CURVE

[GM]

Originally Posted by Pano

Any way you can post a screen shot of the fields filled in before you hit the calculate button?

No problemo. I just realized that after inputting the values that when you hit enter it then displays F12, AT, Cir, so if all you want is to see these it's not necessary to go any further:

To generate a single segment horn profile, all you need do is follow the HELP’s instructions for Horn Parameters S1, S2, L12, T. All the other field’s values are irrelevant!

F12 displays Fc.

AT displays the throat’s half angle in degrees if you want to know how it lines up with a driver’s exit angle.

Cir displays the percentage of mouth area to a full size horn based on the local boundary loading specified in the Ang field.

Click Calculate.

Click Window/Schematic Diagram in the taskbar.

Click File/Export/horn data in the taskbar to pop up the Export Horn Data window. Scroll down to this section of HELP if you have any problem figuring it out.

Once any changes are done [if any], clicking OK pops up a window to save it as a txt or csv file [you choose], which can then be opened in an appropriate program to view all the horn’s dimensions at whatever expansion distance specified and/or generate a drawing to print out templates.

GM

[Cal Weldon]

I may be wrong but the horn seen in Pano's pic, post 649 doesn't look like JRKO's curve. If you mirror image that curve and make a football shape, the JRKO one has more 'gap' than Pano's horn.

[JRKO]

My Bad- I should have halved the numbers Pano gave to get a from centre distance

Hang on a moment and I'll post the correct curve.......

here we go

[Cal Weldon]

Now we're talkin'

[Pano]

Right, hornresp does give the 1/2 dims, but I doubled them in another column to check against my measurements. The flare does seem a little different at places, but I doubt it will matter. Shootz, might even be better!

EDIT: JRKO, I took your graph and overlaid it onto the photo of my horns, both the 803 and the 1005. It matches perfectly. So there you go!

[Pano]

Thanks GM. My problem was that I was trying to do a mult-segment horn (kinda), and didn't need to.
Does "angle" matter to the flare in this case? Or just to the calculated response?

[GM]

Ang or AT? Anyway, Ang is just for calculating additional boundary considerations for the various plots and AT only applies if you're trying to match the throat angle to an adapter or driver with a short horn in it.

GM