The I221 is a 12% I unknown composite motor from Contrail.
| Average Thrust: | 206.4830 N |
| Certified By: | Tripoli Rocketry Association |
| Class: | 12% I |
| Delays: | 1000 seconds |
| Diameter: | 38.0000 mm |
| Length: | 719.0000 mm |
| Letter: | I |
| Manufacturer: | Contrail |
| Name: | I221 |
| Peak Thrust: | 482.7530 N |
| Propellant: | APCP |
| Status: | In-Production |
| Thrust Duration: | 1.7400 s |
| Total Impulse: | 359.2810 Ns |
| Total Weight: | 710.0000 g |
| Type: | Unknown |
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