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[quote user="Norm48327"]Volker, I respectfully disagree. Mud Chicken works for one of the most respected survey firms in the US and I believe his qualifactions are abobe reproach.[/quote] Norm, what problems do you have. I haven't criticized mudchicken, at least it wasn't my intention. I answered to petitnj's post who had problems as I  understood with mudchicken's post on the page before. The degree of curve definition uses a 100' chord and mudchicken used a 62' chord instead but not to define the degree but to show the ordinate h. With given radius and degree of curvature you can use whatever chord length you like you just get different ordinates. To show this context I linked the Wiki circular segment website. If it was understood as criticism I apologize. It is a foreign language and I know what I want to say. On the other hand I don't automatically believe a statement just because it is from an expert. If I had done so I wouldn't have survived in my occupation as civil engineer and structural design manager. Regards, Volker Edit: BTW someone who passes out in this way like mudchicken (quote) Some of the other so-called "experts" on spirals on this forum apparently do not live in the real world or are chronic liars looking for attention, should be able to take criticism
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