32 Helicopter Duration Competition

32.1 Scope
Helicopter Duration Competition comprises nine events open to any single-staged model rocket that uses the principle of autorotation as the sole means of recovery. The purpose of this competition is to achieve the longest flight duration using an autorotating recovery system.
 
32.2 Autorotation
Each entry must be decelerated during descent by its autorotating recovery device. The resulting autorotation must be around the vertical axis. A model that descends nose first, or flips over once during descent is permitted. A model that flips over more than once shall be disqualified.
 
32.3 Recovery
Recovery devices employing flexible (e.g., plastic film or cloth) surfaces are prohibited. Entries using a recovery system which is designed to act (or which actually acts) in a manner similar to a parachute, a rigid inverted bowl, or similar techniques are specifically excluded from this competition.
 
32.4 Classes
This competition is divided into classes based on the permissible total impulse of the motor(s). The following classes of Helicopter Duration Competition are established:
 
Motor ClassWeighting FactorMulti-Round Maximum
1/8A2120 sec
1/4A2030 sec
1/2A1960 sec
A20120 sec
FAI A20180 sec
B21180 sec
C22240 sec
D23300 sec
E24300 sec
F26300 sec
G27300 sec

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