# Understanding Polars Without Math

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#### blane.c

##### Well-Known Member
HBA Supporter
My new book came in today "Understanding Polars Without Math" A guide to getting the most from polar diagrams by Bill and Bunny Kuhlman. It is providing sense from chaos for me and I recommend it to anyone looking for clarification of polars. Now the math makes sense. I found reference to the book and searched online for it and found a used copy through ABE books, also there was a site that you could download a copy from.

##### Well-Known Member
HBA Supporter
An oldie but goodie!

#### pwood66889

##### Well-Known Member
Are these "Polars" as in measuring by bearing and distance? As opposed to Cartesian, which are X and Y orthogonal.

#### mcrae0104

##### Well-Known Member
HBA Supporter
Log Member
Are these "Polars" as in measuring by bearing and distance? As opposed to Cartesian, which are X and Y orthogonal.
No, they are Cartesian

#### pwood66889

##### Well-Known Member
Guess I'm not up on that, Blane. Perhaps an explanation??? Thanking you in advance.

#### Norman

##### Well-Known Member
Although modern airfoil charts are called "polars" they are ordinary X,Y graphs. Some, most notably those from the Eppler program, put all the curves on one chart with multiple X,Y scales. This can be very hard to read and that's why a book like "Understanding Polars Without Math" exists.

BJC