the ISU has a jump instruction DVD showing simulation of single jumps. here is one i found for the lutz
https://twitter.com/chiburahakkai/status/1020616883257540608?lang=en
i found this off a google search (i believe one also came up from the same twitter account for a salchow) but all other search results were fan made videos/manuals. i have no idea if the DVD is available for sale anywhere.
Very good example to make clarification about "cheated take off" rule btw - which so many people here are perceiving wrongly, IMO. If you watch this ISU educational videos carefully - you will notice that examples of jumps there are divided in several basic stages - with very particular names to them. For example, a jump has preparation stage, take off stage, rotation stage, landing stage etc. - each of them illustrated by corresponding part of video. What is most important here -
take off stage is not a moment when skater leaves the ice . Take off stage in this video includes picking phase, prerotation phase and lifting off the ice phase. In other words - take off stage begins just after preparation stage - which includes entry to a jump and making body position just before picking leg hits the ice! See where I am going with this?
Considering the above "A clear forward take-off" wording in the rule is meant for a moment when skater just ended his preparation phase - just before picking moment in case of toe jumps
In other words - all typical half-turn prerotated jumps are considered as being
taked off from backwards by this "take off" definition. And, as it happens, this explanation coincides perfectly with so called toe axels as well - they are exactly jumps being done with facing forward position before any picking or prerotation even begins
Toe-axels as defined by the ISU should pretty much
never be seen at the elite level, no. It's a very unintuitive way to jump. The classic example people usually point to is this combo by Mai Asada:
https://youtu.be/-PcNa89WPaQ?t=4m4s
As you can see, she is not even prerotating on the ice, just straight up placing her foot forward as if she was stepping up into an axel.
I wouldn't be so sure about it. At least it happens some times among top juniors and novices too. Here are examples of Alysa Liu's toe axel in 3A+2T
https://youtu.be/pbdNAD4FU6Q?t=280 (it wasn't called)
and Sofia Akatieva's toe axel in 4T+2T
https://youtu.be/cRRGZQbHuX0?t=200 (it was properly called as it's shown in protocol at the end of video).
So it happens even in judging practice - while rarely. That said, it has nothing to do with prerotation - and it has never being meant to be used as something more than rule against "toe axels".
Oooh so that's what it means. In real time it really looks odd, no wonder ISU addressed it. And basically ISU has no rules against prerotation as far as I understand? Pretty much everyone has 180° PR on +T, S and Lo, more than a half of the skaters on flips and lutzes as well, but their height and distance often suffer. I doubt that ISU will consider 90< PR to be an error as so many skaters will have to change their technique completely.
Yes, exactly. It's sad there are so many people who are honestly misunderstand this rule (or being manipulated to believe in it this way) and arms with it their crusades against "ISU corruption" :dumb:
It's typical mistake when determining URs - mixing exit curve on ice with rotation of the jump on ice. It's very common when rotated jumps are having deep curve on exit - because skater making turn to avoid running into board just after the landing.
