(section: 1 / line: 3)
(section: 3 / paragraph: a / line: 1)
Either conceptual or actual is acceptable.
(section: 3 / paragraph: a / line: 4)
Balloon - material that can be filled with air, to swell or puff out. Parachute - any material that fills with air and allows an object attached to it to descend slowly. Both definitions have in common the fact that materials fill with air. If the material on the rotors is not taut, then the device will be considered a parachute or balloon and may be placed in Tiers 3 or 4.
(section: 3 / paragraph: a / line: 4-5)
The definition of an airfoil is any surface, as a wing, aileron or stabilizer, designed to aid in lifting or controlling an aircraft by making use of the air currents through which it moves. A rotor device may have curved wings with some type of material that is taut and completely enclosing both the upper and lower surfaces. If the curved wing is catching air and behaving as a parachute it is not allowed.
(section: 3 / paragraph: e / line: 1)
The entire device (with the cup), in both launch and flying configuration, must fit into a 51 cm cube in any orientation the student chooses. The entire device does not have to rotate in the 51 cm cube when it is being measured it just has to fit within the cube.
Students will be the ones who choose the orientation of their device in the cube and place it in the cube for verification. Students must be the only ones to touch their device. As long as it fits into the allowed dimensions of the cube,in flying configuration which means with the cup attached, then it passes.
(section: Event / line: 1)
The rotor should rotate at least once around a central axis or it could be determined to be a parachute or glider. It will be up to the event supervisor to determine whether the device has rotated around the central axis.
Students will be placed in Tier 3 or 4 if the cup does not hit first. Construction 3.d. "No other shock absorbing or cushioning materials can be used..." If another part of the device hits first it would act as a shock absorbing material.