This current European Championship for Carpenters task model is extremely complex. I wonder if the apprentice carpenters had the drawings before the competition? Or how many of them actually completed the task model?
Here's a couple of drawings of the European Championship for Carpenters task model 2014. I'm still not done, but you can get an general idea of how much geometric roof framing knowledge each of the apprentice carpenters must know to complete the task model.
3D drawing of the European Championship for Carpenters task model. I'll use this drawing to verify the geometry I develop is correct.
Basic ground plan of the roof.
Technique to develop the eave line that is level in plan view.
3D drawing of the hip rafters and raking/sloping plate lines.
3D drawing with plumb lines to establish the location of the jack rafters and purlin rafters on the roof surface.
Drawing of the base that holds up the roof.
Front sloped legs of the base.
Drawing with the legs and plates of the base.
Trying to establish the rotation of the hip rafter rotated into the roof surface.
Developing the profile rafter slope angle on the sides of the task model.
Raccord drawing of the roof surface.
Raccord drawing of the roof surface with the rafters on the roof surface.
Trying to develop the correct location of the rafters on the roof surface.
Drawing showing the technique I used to establish the miter line on the roof surface using the hip rafter backing triangle and the depth of the profile rafter.
Drawing with the hip rafter foot print developed from the hip rafter material block rotated to the hip rafter backing angle.
Drawing showing the development of the Devers De Pas line for the DP side of the hip rafter rotated into the roof surface. Sure am glad I studied the Treteaux angles.
Transferring the lines to the sides of the timbers on the rof surface.
tréteau à devers Roof Eave Angle = 126.58678 SS = Main Rafter Slope Angle = 38.65981 S = Adjacent Rafter Slope Angle = 37.05220
__________________________________________________ DD = Main Plan Angle = 60.00000 D = Adjacent Plan Angle = 66.58678 R1 = Hip Rafter Slope Angle = 34.71501 C5m Main Hip Rafter Backing Angle = 18.20076 C5a Adjacent Hip Rafter Backing Angle = 13.85266 Valley Sleeper Saw Blade Bevel Angle = 90° - (C5m + C5a) = 57.94657 P2m = Main Jack Rafter Side Cut Angle = 24.26751 90° - P2m = Main Roof Sheathing Angle = 65.73249 P2a = Adjacent Jack Rafter Side Cut Angle = 19.06421 90° - P2a = Adjacent Roof Sheathing Angle = 70.93579
Purlin Depth = 70 Hip Rafter Depth = 60 Hip Rafter Width = 60
DP Side Claw Line DimensionsRoof Sheathing Angle70.93579°Seat Line for Rafters in Ground Plan Dimension116.17440Seat Line for Rafters on Roof Surface Dimension92.71727Claw Line #1 Dimension0.00000Claw Line #2 Dimension113.05613Claw Line #3 Dimension43.83167Claw Line #4 Dimension1.26481
Tilted Hip Rafter Slope Angle on DP Side of Hip Rafter.
Horizontal Plane Rotation Angle for Tilted Hip Rafter on DP Line from Footprint to Hip Rafter Run Line.
Horizontal Plane Rotation Angle for Tilted Hip Rafter on DP Line from Eave Line to Hip Rafter Footprint
Vertical Plane Rotation Angle from Plumb for Tilted Hip Rafter on DP Line
Prism Footprint Saw Blade Bevel Angle Along side of Hip Rafter Rotated into the Roof Surface Plane at Foot Of Hip Rafter
Prism Footprint Saw Blade Bevel Angle Along side of Hip Rafter on DP Side at Foot of Hip Rafter
Prism Footprint Angle in Plan View at Eave Line Intersection
Prism Footprint Angle in Plan View at Intersection of DP Line and Profile Rafter Footprint Line in Plan View