Setting Up your Mono-ski

The first step is to get the skier positioned in the mono-ski, with proper foot and knee height and the pelvis tilted forward in an upright position.

Part I: Adjusting the Fore/Aft Positioning of the Skier’s Center of Mass Over the Ski

  1. Measure the ski from tip to tail across the top, and mark the midpoint of the ski on the side with a marker or piece of tape.
  2. Determine the natural upright balance point. Find a triangular block of wood or a large-diameter wooden dowel 6-12 inches long. When placed perpendicular to and beneath the ski, it should lift the ski about two inches off the ground. With the skier in a neutral, upright position, find the balance point and mark it on the side of the adaptive ski frame.
  3. Slide the wooden block forward, and with the skier in a full forward skiing posture, determine the forward-most balance point and mark this on the side of the adaptive ski frame.
  4. Move the wooden block back, and with the skier in a rearward skiing posture, determine the rear-most balance point and mark this on the side of the adaptive ski frame.
  5. For a new skier, the midcord mark on the ski should be midway between the forward-most and rear-most balance point (or it can be closer to the neutral point); adjust the binding as necessary.
  6. If you mark these three points permanently on your mono-ski frame, they can be used as reference points for mounting your ski and making later adjustments in the ski position. When mounting the mono-ski system on the ski, start with the neutral center-of-mass balance point directly over the ski’s midcord position or halfway between the forward-most and rear-most balance points.
  7. Adaptive ski-program staff can mark the midcord position on the program’s skis and place marks on the frame of the mono-ski at one-inch increments, well forward and aft of the various balance points. Numbering or lettering these marks will allow you to keep track of where the ski should be adjusted for each skier.
  8. When first-time skiers use program equipment, they can get in the ski and find their neutral, forward, and aft balance points. Skiers can remember the mark on the mono-ski frame that corresponds to where the midcord position of the ski should be. In the future, they know to set the position for that particular mono-ski to the same mark they used during their last visit. If a program has many differently-marked mono-ski frames, they should have names or numbers so skiers can remember which ones they used. Manufacturers might be encouraged to provide their equipment already marked for program use as well as for individual skiers.

 

Part II: Measurement of Left and Right Angulation Ability for Canting

  1. With the skier fully strapped into the mono-ski and a full-length ski attached, position the ski on a piece of thick-pile carpet or foam that will allow the skier to rock back and forth and side to side.
  2. Position an inclinometer across the ski, as close as possible to the ski’s mounting point. Have the skier angulate as far as possible in one direction. The outriggers should barely touch the ground, and the skier should be leaning over to keep from falling over. Measure the maximum angulation angle that can be reached in each direction.
  3. If the amount of angulation in each direction is equal, no further adjustments are necessary. If a skier can angulate farther in one direction than the other, the ski can be canted. For example, if the skier can angulate 10¡ in one direction and 6¡ in the other, a 2¡ cant will enable him or her to angulate 8¡ in each direction. Although canting is ideally done on the ski, seat canting at the mounting point works well. In a program ski, insert stiff foam into one side of the seat shell to shift the skier to the side.

 

Part III: Measurement of Rotational Ability

  1. Not all skiers have the same range of rotational ability. Some can turn their upper bodies more in one direction than another, and this inequality can limit their ability to make equal turns in both directions.
  2. Have the skier rotate as far as possible in each direction, noting the angle of trunk rotation at the shoulders.
  3. If the amount of rotation in each direction is equal, no further adjustments are necessary. If he or she can rotate farther in one direction, rotate the seat to compensate. For example, if the skier can rotate 20¡ to the left and 10¡ to the right, a 5¡ seat rotation will allow him or her to rotate 15¡ in each direction.

Gallery

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