Angles used in calculations are be expressed in radians
Outside Radius = (119.518146² + 4 × 33.318771²)/(8 × 33.318771) = 70.25 Arc Length = 2 × 70.25 × arcsin ((.5 × 119.518146)/70.25) = 142.922934 Check: Circular Arch Calculator … enter Arch Width and Arch Height The arc length and angle are divided into five equal parts: Section Arc Length = 142.922934/5 = 28.584589 Miter Angle = arcsin ((.5 × 119.518146)/70.25))/5 = .203449016 Miter Angle = .203449016 × 180/pi = 11.656770° … starts at the 1.448869 sagitta depth* Stock Length = Chord = 2.× 70.25 × sin .203449016 = 28.387801 Sagitta = 70.25 × (1 – cos .203449016) = 1.448869* Check: Sagitta Calculator … enter Section Arc Length and Chord (Stock Length) Height from Circle Center = 70.25 – 10.448869 = 59.801131 Inside Radius of Arch = 70.25 – 9 = 61.25 Height of Inside Radius from Circle Center = 61.25 × cos .203449016 = 59.986752 Height of Inside Radius from Bottom of Timber = 59.986752 – 59.801131 = .185621 Stock Depth = 9 + 1.448869 – .185621 = 10.263248 Dimension of Inside Radius from Arch Center = 61.25 × sin .203449016 = 12.375465 Check: Bow Window Calculator … enter: Width or Span = 119.518146 Projection = 33.318771 – 1.448869 = 31.869902 Number of Bays (the number of arch sections) = 5 |