标题: PSIA's 3 Phases of a Turn (We Don't Call Them 123) [打印本页] 作者: snowrider 时间: 2013-11-22 00:42 标题: PSIA's 3 Phases of a Turn (We Don't Call Them 123) The phases of a turn in PSIA's eyes consist of: Initiation, Shaping, and Finishing.
First - it is not "apex to apex", nor is it "transition to transition".
Second - it is the turn from start to finish from the perspective of the "skier"....not the "skis". This may seem pedendatic, but its a critical distinction.
Phase 1 - Begins when we "release the body" from the turn and let it flow or begin moving into the new turn. It is characterised when the skis begin to REDUCE edge angle. This will typically be at some point after the fall-line. Phase 1 ends at skis flat or "neutral".
Phase 2 - is "estabishing the platform". It begins at skis flat, and ends when the skier has something stable to stand on.This phase is also known as the "intiation phase" for those who read RL. Note the skier has not started to turn yet (to any appreciable amount)...the skier has only moved across the skis and gotten his mass forward in antcipation of the start of phase 3. This phase is where the pivot or stivot will happen if there is one. In the case of turns with some form of stivot this phase is longer...in pure arc to arc skiing particularily at the WC level, this phase is very short.
Phase 3 - is where the skis turn the skier. We can increase edge angle or manipulate fore/aft pressue here to "steer"....in more skidded turns we can also manipulate the steering anlge via pivoting. Hence this is where we have alot of control over the shape of the turn, and since the skier is now being turned by the skis we feel the loads greatest here. Hence this phase is also known as the "control phase" or "shaping phase" or "loading phase". It ends once we have turned the mass as much as we require and release it to move into the new turn...where Phase 1 begins again.
Blue line is "skier", black is "skis"作者: checkmoteur 时间: 2014-4-21 18:33 本帖最后由 checkmoteur 于 2014-4-21 19:46 编辑
上面是原帖，仅仅是c的phase的图解，红线是身体的path，黑线是skis的path。
雪侠发那个图，是后来有人在这张图的基础上，加标了p的分法，以资比较：
蓝线仍然是身体，黑线仍然是skis。并不是c和p各画一条线。更不可能有比较c和p的优劣的意思。
这人的结论，也是相当中性的：
I "think" this is pretty close if we are to mach up each others definitions.
