Calculators that will test if a Compound joint with matching angles, faces and equal log diameters is possible.
Note the definition of the Deck Angle required as an entry.
For example, refer to the diagram of the FourBranch Compound Joint above.
The value of the Deck angle entered for Plane B is:
180 
( DD Hip AB, Side B
+ DD Hip BC, Side B )
Also note that the entered angle is measured with respect to the Actual Deck.
Returned values for
DD
are in their normally defined positions about the feet of the Hip rafters,
but measured with respect to the Inclined deck.
To generate a more extensive list of values, enter the values returned for Pitch angles
SS and the sums of Deck angles
DD about the Hip rafter foot in
Lag
or any similar calculator.
