Posted by Pat on November 27, 2002 at 08:58:37:
In Reply to: Re: Re: Basic lengths of tubas posted by Alex C on November 26, 2002 at 22:16:46:
The lengths are calculated from physics equations using the speed of sound etc. They are for a length of tubing that doesn't grow in diameter either. The tempature and humidity etc. will effect the length. My figures are for normal or average tempature. You can take 60% of the bell diameter and subtract that from these lengths to get the physical length. I don't understand the 60% thing, I just read it somewhere. Bells are different designs and shapes. 60% would be an average I guess. Taking the bell off my 20J should raise the pitch at least 1 full step, yet in reality it only goes up about 1/2 step. I don't understand that part at all. I see 1 response where the Eflat tuba is not twice the length of the Eflat horn, nor is the BBflat tuba twice that of the Bflat baritone. An octave should double the length.