Drag Race Facts

Discussion in 'Drag Racing' started by Tom, Sep 20, 2004.

  1. Tom

    Tom Guest

    Drag Race Facts
    Sponsored by: BFGoodrich Asian Motorsports Festival
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    Drag race overview
    A drag race is an acceleration contest from a standing start between two vehicles over a measured distance. The accepted standard for that distance is either a quarter-mile (1,320 feet).

    Ready, get set....
    These contests are started by means of an electronic device commonly called a Christmas Tree because of its multicolored starting lights. On each side of the Tree are nine lights: four small amber lights at the top of the fixture -- two stage and two pre-stage -- followed in descending order by three larger amber bulbs, a green bulb, and a red bulb.

    On your marks
    Two light beams cross the starting-line area and connect to trackside photocells, which are wired to the Christmas Tree and electronic timers in the control tower. When the front tires of a vehicle break the first light beam, called the pre-stage beam, the pre-stage light on the Christmas Tree indicates that the racer is approximately seven inches from the starting line.

    Go!!
    When the racer rolls forward into the stage beam, the front tires are positioned exactly on the starting line and the stage bulb is lit on the Tree, which indicates that the vehicle is ready to race. When both vehicles are fully staged, the starter will activate the Tree, and each driver will focus on the three large amber lights on his or her side of the Tree.

    Depending on the type of racing, all three large amber lights will flash simultaneously, followed four-tenths of a second later by the green light (called a Pro Tree), or the three bulbs will flash consecutively five-tenths of a second apart, followed five-tenths later by the green light (called a Sportsman, or full, Tree).

    Two separate performances are monitored for each run: elapsed time and speed. Upon leaving the staging beams, each vehicle activates an elapsed-time clock, which is stopeed when that vehicle reaches the finish line. The start-to-finish clocking is the vehicle's elapsed time (e.t.), which serves to measure performance. Speed is measured in a 60-foot "speed trap" that ends at the finish line. Each lane is timed independently.

    The first vehicle across the finish line wins, unless, in applicable categories, it runs quicker than its dial-under or index. A racer also may be disqualified for leaving the starting line too soon, leaving the lane boundary (either by crossing the centerline, touching the guardwall or guardrail, or striking a track fixture such as the photocells), failing to stage, or failing a post-run inspection (in NHRA class racing, vehicles usually are weighted and their fuel checked after each run, and a complete engine teardown is done after an event victory).
     
  2. alien

    alien Senior Member
    Senior Member

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    ...the dial-under or index...
    how does it work?
     

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