The 1633K940-18A (K940) is a 28% K 54mm 4-grain reloadable composite motor from Cesaroni Technology Incorporated (CTI).
This motor uses an E-Match igniter.
This reload fits a Pro54-4G motor case.
CTI's White Thunder propellant produces a white flame and light gray smoke.
| Average Thrust: | 910.4370 N | 
| Casing: | Pro54-4G | 
| Certified By: | Canadian Association of Rocketry | 
| Class: | 28% K | 
| Delays: | 8,9,10,11,12,13,14,15,16,17,18 seconds (variable) | 
| Designation: | 1633K940-18A | 
| Diameter: | 54.0000 mm | 
| Formula: | White Thunder | 
| Igniter: | E-Match | 
| Length: | 404.0000 mm | 
| Letter: | K | 
| Manufacturer: | CTI | 
| Name: | K940 | 
| Peak Thrust: | 1,115.7900 N | 
| Propellant: | APCP | 
| Status: | In-Production | 
| Thrust Duration: | 1.8000 s | 
| Total Impulse: | 1636.0600 Ns | 
| Total Weight: | 1366.5000 g | 
| Type: | Reloadable | 
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