logarithmic curve shaped tuba?

[OldsRecording]

Like this?

COURTOIS%20ANTONIOPHONE%201.jpg

I believe Courtois made them in several sizes.

[eupher61]

serpenttuba.jpg

[OldsRecording]

I don't think the pictures posted here are what the OP is looking for. They are just tubas with the tubing rotated. I believe he is looking for something more along the lines of a french horn shape with spiral valves.

I guess I'm having trouble envisioning what a Fibonacci Curve inspired tuba would look like. When I read the OP, the Antoniophone was what came to mind. Although the spiral valve concept sounds interesting. Any of you engineers out there want to take a whack at it?

[tubatom91]

hmmm. That looks like a lot of fun.

[sc_curtis]

Ok, where do I buy one?


Seriously, I want one... Now...

[OldsRecording]

This is the latest product from Fibonacci-Helleberg:

lily_impeller_thumbnail.jpg

[eupher61]

it's in G (the bass horn, not the mouthpiece) Is it "Boboissimo" that uses it? Or "Gravity is Light Today"? One of those albums...

[Dean E]

In June 2005, I attended a Chicago Symphony Orchestra performance, at Chicago, (sorry, but I don't recall the names of the piece or performer), where part of the featured trumpet solo was performed on a conch shell or conch shell trumpet (but I could be wrong). The instrument added tonal texture to the work, although I'm not sure how purists, pedantics, or audition committees would react.

I would be interested to see graphs of tubing diameters for the frequencies in the tuba range, where x=length and f(x) would be an exponential value. The limits on f(x) would range from a common leadpipe diameter to a common bell diameter. Yogi Berra (maybe originally Casey Stengel or James Thurber) used to say, "You could look it up," and I'm suggesting this avenue of research to the original poster.

[windshieldbug]

Horn Construction Patent

[Dean E]

Horn Construction Patent

That looks like an electric horn for a car or truck. Everything old is new again.

[bill]

I (and about 300 others) were present when this tuba was delivered to Roger Bobo. It was at1978 ITEC, held in Los Angeles. It came from the fellow who made it (can not remember his name but some one of you will - he did a lot of custom work for Bobo, and was well known in L.A.) and was delivered in a green garbage bag. It was impressive!

[OldsRecording]

l060600a.gif

I've been thinking about the logarithmic curve thing, then it hit me...

9023717.jpg