RESEARCH CLASS
| Motor Diameter |
Motor Length |
Approx Class |
Altitude | Name | Date |
| 24mm | any | E | |||
| 29mm | any | F, G, H | 8,288 | Chet Geyer | 08/01/2003 |
| 38mm | under 12" | I | |||
| 38mm | over 12" | J | 7,982 | Bob Yanecek | 08/20/2005 |
| 54mm | under 12" | J | |||
| 54mm | 12" - 24" | K | 16,932 ft | AJ & Tony Alcocer | 08/01/03 |
| 54mm | over 24" | L | 23,266 ft | Dave Ramondi/James Marino | 09/25/2006 Black Rock |
| 75mm | under 26" | M | |||
| 75mm | over 26" | ||||
| 98mm | 29" - 48" | N | |||
| 98mm | over 48" | O | |||
| 5" | any | O - P | |||
| 6" | under 80" | P | |||
| 6” | over 80" | Q |