EXACT Lengths of Alto, Tenor, and F-Attachment Trombones

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Neo_Bri
Posts: 1342
Joined: Mar 21, 2018

by Neo_Bri »

Hello chattles!

I would like to know exactly, in cm or inches, how long some instruments are. Assume A=440 and mentioned notes are perfectly in tune. If answers are to the nearest hundredth of an inch or centimenter, I'd be appreciative.

Alto: 1st position Eb

Tenor: 1st position Bb

F-Attachment: 1st position F

Thanks!
M
Matt_K
Posts: 4809
Joined: Mar 21, 2018

by Matt_K »

I think this is what you're after for #2 and #3 (check out the second post): <LINK_TEXT text="https://trombonechat.com/viewtopic.php? ... gth#p65057">https://trombonechat.com/viewtopic.php?f=16&t=6661&p=65057&hilit=length#p65057</LINK_TEXT>

Edit: actually you should be able to take Eb and divide by 2 right?

A Bb horn is approx 108 inches tube length, for every 1/2 step higher, divide by 1.0595 (twelfth root of 2)

For every 1/2 step lower, multiply by 1.0595, so that:

Eb=80.9 (alto length)

D=85.7

Db=90.8

C=96

B=102

Bb=108 (tenor length)

A=114.4

Ab=121.2

G=128.4

Gb=136

F=144.2 (F contrabass length)

E=152.7

Eb=161.8

D=171.4

so F to G = 144.2 - 128.4 = 15.8 inches removed (7.9 inches per leg)
N
Neo_Bri
Posts: 1342
Joined: Mar 21, 2018

by Neo_Bri »

Yeah, that should do it. Didn't realize that old thread had a full chromatic list.

Thanks!
L
LeTromboniste
Posts: 1634
Joined: Apr 11, 2018

by LeTromboniste »

There's no such thing as an exact length that is the same for all instruments. Bore size, profile of the curves of the instrument, bore profile/conicity, mouthpiece, individual sound production characteristics on the part of the player, etc etc, are all factors that affect the pitch. There's a rough approximation that will be basically right, but a precise number at the hundredth of a cm? No