The use of any type of winder is recommended. However, electricity may not be available at some sites. For easier handling of fully wound motors, rubber 0-rings may be placed on the rubber motor prior to winding and used to attach the motor to the airplane and propeller drive shaft. The mass of the 0-rings and lubricant will be included in the total mass of the motor. The event supervisor will designate the flight area and all flights must initiate from any location within this area.
Timing starts when the airplane is launched.
Ricocheting off a wall or obstacles does not stop timing. Sliding or bouncing along the floor is not aloft. Participants will be permitted to make adjustments to the airplane, however, time for such adjustments will be part of the 7-minute flight period. The winner is 'the team with the longest time aloft for either flight measured to the nearest tenth of a second. Ties will be broken by the best average time aloft for the two flights.