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Paul S wrote:

Funny, because your "sections 3 - 4" explanation was the perfect response to the first thing/question that popped into my head when I first looked at the picture. Yes, theoretically, one might "reduce" any flowing dimension as long as the area of the mouth none-the-less increases according to the recipe. Still, this is the first time I remember seeing a "decrease" rather than an increase along any extending axis of any horn (other than moronic nonsense).  Since you explained it unprompted going in, I ass-u-me this feature is planned. Is this something you have done or seen/heard done before; or is this a little twist of your own?

Well, the horn has a few functional curves.

1)    First Section is a transition from circular throat to rectangular mouth of the First Section. This is a complex transition and it will be done in an interesting original way. You will see as time goes by.

2)    Second section is a simple section - it is a symmetrical trapezoid that is pretty much a conical horn

3)    3rd section is a complex transition from symmetrical trapezoid to very much non-symmetrical trapezoid

4)    The rest sections are in a way the same expending non-symmetrical trapezoids

My carpenter assures me that the mouth of the 3rd section is right and I think he is correct as the 3rd section is relatively swiftly expends in one dimension and relatively rapidly collapses in another. I do understand it but I also feel that my carpenter might go a bit too far in his approximation. This is exactly why we test-assemble the horn before to solidify it.

I am debating with my carpenter and the most important with myself if the connection between 3 and 4 sections need to be redone. Intellectually I think it is fine as is but my carpenter teaches me that an agley looking airplane does not fly well…  I think if we slow a bit the horizontal expansion of the 3rd section and smooth the indention of the 3rd section in vertical plain then we will have more natural curve with the same mouth aria on the exit.

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