Thomas Monto wrote:
Most prople just apply the brakes to the chair. Some use curved blocks to sit under the wheels and prevent movement. Others place rods at the corners of the chair. My opinion is that just locking the wheel brakes is adequate.
Most wheel chair users sit on a cushion either foam or air to prevent sores. That being said, it is not a solid platform to be sitting on. This will allow movement. Try using scatt and see what the movement is with and without stabelizing additions. I think you will notice no difference. Also using blocks or stabelizers makes the small adjustments to get proper NPA more difficult.
At the IPC World Cup - Ft Benning this past week, probably the chair that got quite a bit of attention was the one of Veronica Vadovicova of Slovakia. She has screw down jacks that stabilize and level her chair. This was especially handy on the 50m line where the floor back from the door is not level. They had a small battery powered drill to run these jacks up & down.
The only issue that I saw that could potentially hurt someone who had a complex system such as this is in a final ... a bit more time is taken up jacking down the chair (not very high ... just enough to level ... wheels not jacked off the ground) moving the position and then jacking them back up for the new position. All of the coaches/helpers moving about the line in the final may make the IPC make some rule changes limiting how much help the shooter can have in a final. They, like ISSF, are very concerned about the appearance of the line during the portions of the events that are sure to be televised.
It did not hurt Veronica all that much, timewise, as it was obvious that their finals choreograph was a practiced one.