A generator assembly is swingably mounted on the tail of a ski with a generator wheel for snow surface contact. A carrier component of the generator assembly is vertically positionable to permit retraction of the generator wheel from snow surface engagement. A tubular control member permits remote positioning of the carrier as by a ski pole tip. Pivot means permits horizontal swinging motion of the generator assembly. Speed indicator means are actuated by changes in current flow from the generator. Contacts on a ski binding component permit transfer of electrical current to a ski boot for various purposes.
A plate mounted turntable is carried on the trailing end of a ski and rotatably supports a carrier having a rotary position sensor thereon. The carrier additionally supports an arm assembly which includes wheels or a skid for penetration of a snow surface. A portion of the rotary position indicator remains fixed during arcuate travel of the carrier and attached arm assembly in response to lateral loads applied to the arm assembly during ski travel. Resilient members ensure arm assembly contact with a snow or other surface and return of the carrier to a neutral position in the absence of lateral loads. A lock maintains the arm assembly in a raised, inoperative position. Signals produced by the rotary position sensor, during lateral arm movement, are conducted to a data logger for storage therein and for ultimate downloading to a personal computer. Signals produced by the sensor indicate both extent of lateral movement of the arm assembly as well as duration of same. A power source is carried by the plate structure for energizing the sensor.
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