As a learning and exploring hornist, i've been wanting to expand my instrument count, but i've been thinking. I would really like a natural horn, but i can't find any. Do they make them still? But as i finacially reason with myself, my current double horn can just be played as a natural horn with different fingerings instead of crooks.
What fingers work with each natural horn scale?



Second question is there a formula or something to figure out the relationship between tube lenght and pitch drop?

Your F horn is in the key of F. So when you add the second valve you drop it a half step into E, 2st valve puts you in Eb, 1&2=D, 2&3=Db, 1&3=C, 1,2&3=B. On your Bb horn T23=F#, T12=G, T1=G#, T2=A, T0=Bb.

Yes, there are people that make natural horns, and there are quite a few used ones for sale if you look. You can't really play natural horn on your double horn. The natural horn has a different taper and bore and the bell is quite a bit smaller allowing you to use your hand efficiently. But it is fun and a good learning experience to go ahead and practice.

Also, yes, there is a formula you can use to figure out length, but if you're not in advanced math you might want to wait on it a little while.