XX Cargo Boost Glider Duration Competition

XX.1 Scope
Cargo Boost Glider Duration Competition comprises eight events open to any model rocket, one portion of which carries a payload, as defined below, in stable, gliding flight supported by aerodynamic lifting surfaces which sustain that portion aloft. The entry may separate into multiple pieces; only the load-carrying, gliding portion is timed. This event is open both to models with rigid lifting surfaces and those with flexible lifting surfaces. The object in this competition is to achieve the largest product of payload carried and flight duration.

XX.2 Payload Specifications and Scoring
The gliding portion of an entry must carry at least one standard NAR payload. The contest director shall select between two methods of scoring:

a. One flight load: The score for each flight of an entry shall be the duration in seconds multiplied by the total number of standard payloads carried on that flight. Each flight by a competitor may be made with a different model and may carry a different amount of payload (except in the case of multiround, where only two models may be used for three flights).

b. Two flight load: The score for each flight of an entry shall be the duration in seconds multiplied by the total number of standard payloads carried over two flights. The two flights must be made by the same model, but different amounts of payload may be carried on each flight. There is no multiround version of this scoring system.

The standard NAR model rocket payload is a non-metallic cylinder containing fine sand, with a mass of no less than 28.0 grams. This cylinder shall be 19.1 millimeters ( +/-0.5 millimeter) in diameter, and 70 millimeters (+/- 10.0 millimeters) in length. The payload may be permanently sealed to prevent the loss of the sand. No holes may be drilled into it, no changes made in its shape, and no other material may be affixed to it.

XX.3 Payload Carriage
The standard NAR model rocket payload or payloads carried in a model shall not separate from the model in flight, and shall be removable from the model.

XX.4 Disqualifications
Any entry whose total weight at liftoff exceeds the manufacturer's recommended maximum lift weight for the motor or motor combination used shall be disqualified.
An entry that descends with parachute and/or streamer recovery device(s) permanently attached to the gliding portion of the model shall be disqualified. However, other portions of an entry may deploy parachutes and/or streamers for recovery purposes.
If the gliding portion accidentally rips a streamer being used to recover another portion of the entry and the streamer becomes attached to the gliding portion, the entry may be qualified depending on the RSO ruling that the entry still glided and was not disqualified for other reasons.

XX.5 Classes
This competition is divided into classes based on the permissible total impulse of the motor(s). The following classes of Cargo Boost Glider Duration Competition are established:

Motor Class Weighting Factor Multi-Round Maximum
1/2A ?? 90 sec
A ?? 120 sec
B ?? 180 sec
C ?? 240 sec
D ?? 270 sec
E ?? 300 sec
F ?? 300 sec
G ?? 300 sec