There are two factors for induced line twists. First, the canopy is at a slow forward speed, second an abrupt turn causes the chute to rotate like a top over head. Line twists can be (inadvertently) induced more easily on certain ram air canopies particularly the high aspect 9 cell variety (versus a 7 cell type). An abrupt toggle input can result in that side of the canopy stalling. This allows the other side to fly around the stalled side in the rotating manner described above. There have been poorly designed canopies that have killed people simply because they were susceptible to collapsing, spinning and/or twisting lines due to turbulence or from abrupt toggle input. If you really want to induce line twists try this; bring the canopy to slow flight using full brakes followed by abruptly raising one toggle to its keeper. If that doesn't work then try an abrupt hook turn at least 180 degrees. Depress the opposite toggle to stop the hook turn then quickly raise the first toggle to its keeper. If that doesn't work then I imagined the two times I inadvertently induced line twists. I would recommend to anyone thinking of trying this; just take my word for it! Definitely don't try it with an elliptical canopy since they will, most likely, spiral out of control. I love going fast and I think I can say with 7300 jumps, I've 'been there, done that'!
