Specifies the slope, in degrees, of the reducer transition. If left blank, CAESAR II assumes the slope equal to the arc tangent 1/2(the change in diameters) / (length of sloped portion of reducer).
TD/12. This entry is a required input for IGE/TD/12.
Because all reducers are different, the actual length of sloped portion of reducer is unknown unless you define it. Because of this, if Alpha is not specified, CAESAR II assumes that the length of sloped portion of reducer is equal to 60% of the total reducer length. If you leave the Alpha value blank, then CAESAR II defaults to arc tangent 1/2(the change in diameters) / (0.60 x element length).