C7 Timber Framing Angle

Timber Framing Angle: C7
C7 = Valley Sleeper Angle, the Saw Blade Bevel Angle to cut a Valley Rafter Sleeper Bevel. Or C8 - 90.

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C7 = arctan (cos S x cos SS))

C7 = arctan (cos(Adjacent Rafter Slope Angle) x cos(Main Rafter Slope Angle)))

The Hip-Valley Roof Ratios Angle Formulas were developed by Joe Bartok.

The Timber Framing Hawkindale Angle Formulas were developed by Rees Hawkins Acheson from the Martindale Hip and Valley Roof Angles and Hawkindale angle drawings by Ed Levin of the Timber Framers Guild.

The Hawkindale angles were based on the book by Frank L. Martindale "Bevel Angles for Three Dimensional Connections" 1948 that was based on the book "Hip and Valley Design" by H. L. McKibben and L. E. Gray published in 1912.