The requirements for each year's challenge are announced during the summer. Teams generally meet early in the school year, and must make official qualifying flights by early April. A team only has three chances to fly an official qualification attempt; only scores from flights that meet the contest requirements, are safe, and don't break the egg can be submitted. Typically, about 60 percent of participating teams submit at least one qualification score. The teams with the top 100 qualifying scores submitted in April compete in the National Fly-off that is held during May at
Great Meadow in
The Plains, Virginia. ARC challenges students to design, build and launch rockets that can safely carry one, two, or three raw hen
eggs (depending on the year's challenge) and consistently come very close to a specified flight altitude and duration. Success requires excellent design, workmanship, and altitude prediction, which means students can learn about
engineering,
aerodynamics,
meteorology, and computer simulation through the program. Scores are calculated as deductions from the perfect flight; the lower the score, the better. The sum of the difference between altitude and the target altitude and four times the difference between duration and the target duration. Many teams consistently achieve scores less than 10. ==Awards to winning teams==