Navytubaman wrote:1. I'd like to see one with valves as easy to move as Trumpet valves.
2. I'd like to see one with a moveable lead pipe so you can custom fit it to your set up.
3. I'd like to see one with a lever attached to the main slide and a trigger so you can manipulate the main slide to adjust pitch instead of pulling 1st and 3rd.
4. I'd like to see one come off the line with vented pistons and slides that move freely so you don't have to take your new horn to the repairman on the first day.
Boredom alert: I'm going engineering geek in response to this.
Okay, I'll take a systems engineering approach to this, and suggest that we first define needs in terms of what we will do with the tuba, then establish requirements in support of those needs, and then (and only then) suggesting some design possibilities to fulfill those requirements.
Your four items (which I numbered), and a couple of Sean's trace to the following needs, expressed as activities: We will play the music provided accurately and in tune without subsequent modifications. We expect the instrument to fit us physically. We will empty the slide by pulling and dumping, by opening a water key, either or both. We will load the tuba on a bus without a case, carry it through doorways, and subject it to occasional bumps with hard objects. We will frequently play the instrument while standing or marching.
The requirements would be:
1. The valves shall move quickly enough to allow accurate playing of 16th-note runs at a tempo of quarter=144 (or substitute your own standard).
2. The tuba shall provide an adjustible mouthpiece position to accommodate any player from 4' to 7' tall (or something like that).
3. The tuba shall provide the ability to mechanically adjust the pitch of all notes using a single control.
4. The tuba shall provide an adjustible position so that the angle of the mouthpiece to the face shall not be dictated by the position of the bottom bow.
5. The tuba shall be constructed of material that can be repaired using conventional techniques, which includes the use of cements.
6. The tuba shall be constructed to resist dents resulting from impacts of 2 G's or less.
7. The tuba shall be constructed to resist any function-limiting damage resulting from a 2-G impact on any part of the instrument from any direction.
8. The tuba shall be designed to allow pulling and dumping of slides without popping sounds and without holding a valve down.
9. The tuba shall be designed so that water can be drained without rotating the tuba more than 30 degrees from normal playing position. (I would rather make it less.)
10. The tuba shall be provided with integral carrying handles.
11. The tuba shall not weight more than 18 pounds (or whatever).
If you express these as requirements, then the manufacturers can come up with their own designs to address those requirements. This allows for innovation without losing sight of what we are trying to accomplish. Of course, there would need to be a set of requirements for things like sound characteristics and number of valves, though some of these would necessarily be subjective. That violates good requirements-writing principles, but it is still a musical instrument. I concentrated on the mechanical aspects that are so often ignored, but that affect our quality of life significantly.
For example, a guard over the valves and water keys would respond to Requirement 7, and if cleverly design might also address Requirement 10. Making the tuba lighter would make it easier to fulfill the durability and carrying requirements in addition to Requirement 11. Using carbon composite might be one approach, but provideing sufficient gaurds might be another approach.
The old Martin adjustible tuning bits were a great response to Requirement 4, and one that I need on several of my other instruments. By the way, that old Martin fiberglass tuba addresses more of these requirements than any of my other tubas.
A main-slide tuning stick would address Requirement 3.
Appropriately placed water keys would address Requirement 9, and vented valves would address Requirement 8. You wouldn't need vented valves for tuning on the fly because you would have already addressed that requirement with the main-slilde tuning stick.
But there may be other ways to fulfill these requirements, too. If we dicate the design without understanding the needs and requirements, we might end up with features that do what we say without really solving the problem we wanted solved.
I think it would be cool to develop a really good set of functional requirements for a tuba that would trace to the needs, using correct engineering procedures. Then, we could evaluate instruments more consistently and objectively. Hmmmm. Maybe a project in the offing.
Rick "who designs for a living" Denney