In this intermediate range of angles of incidence, the impact commences in gross slip but stick occurs at some point during the cycle. The change appears to take place very rapidly; less than 2% of the impact duration is required to pass from complete slip to complete stick. The subsequent history of the impact is similar to that described in
(i), with a reversion to gross slip before exit. As $i is increased the slip-stick transition occurs at progressively later points in the cycle, until the entire impact takes place in gross slip when J/l > 4x - 1.