1803B horn plans available?

[alancohen]

You may find that the shape of those dividers is too complex to fabricate from a single block of wood with any degree of accuracy. unless you have access to a CNC router and can calculate then program the piece you will probably want to stick to the single cell construction method others have used in the past.

Cal, I tried plotting the curves you posted and can't get them to work. Have you tried measuring a radius from the outside of the horn?

The numbers worked for me, Marty. You just need to take into account that the lateral measurements are the entire cross section. You need to cut them in half to get the correct profile. If I can figure out how to get Excel to scale I'd have something!