The 26E31-15A (E31) is a 27% E reloadable composite motor from Cesaroni Technology Incorporated (CTI).
This motor uses an E-Match igniter.
This reload fits a Pro24-1G motor case.
CTI's White Thunder propellant produces a white flame and light gray smoke.
| Average Thrust: | 29.2120 N | 
| Casing: | Pro24-1G | 
| Certified By: | Canadian Association of Rocketry | 
| Class: | 27% E | 
| Delays: | 6,8,10,12,15 seconds (variable) | 
| Designation: | 26E31-15A | 
| Diameter: | 24.0000 mm | 
| Formula: | White Thunder | 
| Igniter: | E-Match | 
| Length: | 69.0000 mm | 
| Letter: | E | 
| Manufacturer: | CTI | 
| Name: | E31 | 
| Peak Thrust: | 43.8240 N | 
| Propellant: | APCP | 
| Status: | In-Production | 
| Thrust Duration: | 0.8700 s | 
| Total Impulse: | 25.4144 Ns | 
| Total Weight: | 52.0000 g | 
| Type: | Reloadable | 
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