Conch shells make a grand sound as a horn, but several species of the the actual animal are endangered, harmed by being harvested for the souvenir industry.

This is my attempt to create a more sustainable version of the instrument.

Step 1: Materials and tools

If you know my work, you know I like simple materials.

This is put together from corrugated card from an old box, duct tape, and a short piece of PVC pipe.

The only tools I used were a craft knife, my trusty Leatherman, and a hacksaw (to cut the pipe to length).
Hi, looks great, Ill try to build one for my home town parties, using it instead of the hard to find natural shells
Cool, post pictures or a video when you do!
The ideal shape is almost certainly one of these: http://www.xaraxone.com/webxealot/workbook22/spirals_0.gif <br> <br>The linear spiral has a constant cross-section so will act like a long tube, the exponential has an exponentially increasing cross section so will act like the bell of a horn (and replicates the proportions of an actual seashell). I made something similar to amplify the rear-facing speaker on my phone so I can hear the speakerphone when it's in the cradle. <br> <br>If you find (or make) a couple of sliding-fit cardboard tubes will we see Roger-X playing the cardboard trombone?
Right now, I don't *which* spiral I make, I just want to make a spiral. <br> <br>(Is there free 3d modelling software that will take pencil scribblings and vague gestures as input?) <br> <br>
Inkscape will make you a nice spiral. You can then output it to another format like dxf for your CAD prg. Neat shell. It will work better if you can make it a tight seal along the edges of the spiral. No leak means a long tube, and that will play MUCH better. <br>
The magic Conch shell! (horn)
You made a snail shell not a conch shell. It is visually appealing because of the &quot;Golden Mean&quot;.
Don't take me as a &quot;hater&quot; for this... I think I'd say that the spiral is indeed visually appealing in spite of the fact that it does not follow the &quot;Golden Mean&quot; or logarithmic spiral. <a href="http://www.sciencenews.org/view/generic/id/6030/title/Sea_Shell_Spirals" rel="nofollow">http://www.sciencenews.org/view/generic/id/6030/title/Sea_Shell_Spirals</a> Fascinating bit of math there if you're interested. I mention this article to correct a very common misconception. :)
Hmmm, less is more, form follows function, beauty is in the eye of the beholder...
A conch &lt;em&gt;is&lt;/em&gt; a snail (isn't it?), just a really big one.
I think you need to use Autodesk software to properly model one. :P
I spent an hour this morning, failing to draw a spiral in 123D...
There's gotta be a squiggly curve line generator in there somewhere. Then you have to stretch the walls up in 3D along some curving axis. I loaded that up, crashes a lot, and big learning curve. I don't think it is really endeared to artists and turns an enjoyable creative experience into a frustrating one.
If there is, I can't find it. Maybe it's not touch-pad friendly, or maybe I just haven't played enough video games...
What is the name of that beautiful musical piece?
That vid put me back to a trip in the Bhamas :-)
Trust me, with the right mouthpiece, it sounds a *lot* nicer!

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