Cluster Altitude
Abbreviation CA
Event Type Altitude
Pink Book Rule 23
Weighting Factor
1/8A x 2
1/4A x 2
1/2A x 3
A x 4
B x 5
C x 6
Flight Attempts Allowed 2
10.4 Applicable? Yes
Pink Book Rule #23

Cluster Altitude is comprised of five events open to single staged model rockets. The purpose of this event is to foster the understanding and execution of a fundamental model rocket skill - clustering - and to achieve the highest altitude.[1]

Event ClassesEdit

Event classes are denoted by the impulse of motor used and the number of motors used. For example the 1/8A x 2 event class denotes that the rocket must use two 1/8A impulse motors.


  1. "2007 Pink Book." National Association of Rocketry. 05 Oct 2007. National Association of Rocketry. 2 Dec 2007 <>.

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