- 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.
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- 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.
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- 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.
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- 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:
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| Motor Class | Weighting Factor | Multi-Round Maximum |
| 1/8A | 21 | 20 sec |
| 1/4A | 20 | 30 sec |
| 1/2A | 19 | 60 sec |
| A | 20 | 120 sec |
| FAI A | 20 | 180 sec |
| B | 21 | 180 sec |
| C | 22 | 240 sec |
| D | 23 | 300 sec |
| E | 24 | 300 sec |
| F | 26 | 300 sec |
| G | 27 | 300 sec
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