R7BV Timber Framing Angle

Timber Framing Angle: R7BV
R7BV = Saw Blade Bevel to cut the shelf cut at intersection of Valley Rafter Foot with Principal Purlin Rafter, along the miter line produced by angle R7.

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R7BV = arctan (sin R7 x tan R3)

R7BV

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.