Ski Cross Reaction Time Measurement

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Photo from the Swiss Ski Cross Team
Photo from the Swiss Ski Cross Team

An important skill in ski cross is the ability to start quickly. This ‘interval time’ or so – called ‘reaction time’, is to be recorded and displayed.

This reaction time value would be added to ski cross qualification and final results (FRIS outputs C72E and C77D respectfully).

Rule Reference see Ski Cross Start Gate or 4507, 3041

[edit] Qualification Timing

Impulse 1;

The first timing impulse is of the gate opening as it passing thru the plane of the photocell, this starts the timing system for the run.

Time of day is recorded.

Impulse 2;

The second timing impulse; The body or part of that body pass thru the photocell.

Time of day is recorded (Output '00:00:32' / Formula; Impulse 2 - Impulse 1 = Start Reaction Time (STT))

Impulse 3;

The third timing impulse the 'short interval'; this timing light beam is 10 meters down the course as measured from the closed vertical gate (maybe it becomes 3 meters)

Time of day is recorded (Output Display '00:01:49' / Formula; Impulse 3 - Impulse 1 = Reaction Time Total (RTT))

Impulse 4;

The fourth timing impulse is at the finish (Output Display 00:01:07 / Formula; Impulse 4 - Impulse 1 = Total Running Time (TRT))

[edit] Final Timing; optional

Impulse 1;

The first timing impulse is of the gate opening as it passing thru the plane of the timing light, this starts the timing system for the heat.

Time of day is recorded.

Impulse 2;

The second timing impulse; The body or part of that bodies pass thru the timing light.

Time of day is recorded.

(Output Display '00:00:32' / Formula; Impulse 2 - Impulse 1 = Start Reaction Time (STT))

Impulse 3;

The third timing impulse the short interval; this timing light beam is 10 meters down the course as measured from the closed vertical gate (maybe it becomes 3 meters)

Time of day is recorded.

(Output Display '00:01:49' / Formula; Impulse 3 - Impulse 1 = Reaction Time Total (RTT))


[edit] Also See


Return to Ski Cross Courses, Freestyle Skiing, Ski Cross, Ski Cross Start Gate or ICR 4507 and 3041

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