The H550ST (H550) is a 94% H single-use motor from Aerotech.
| Average Thrust: | 535.8012 N | 
| Certified By: | Tripoli Rocketry Association | 
| Class: | 94% H | 
| Delays: | 14 seconds (variable) | 
| Designation: | H550ST | 
| Diameter: | 38.0000 mm | 
| Formula: | Super Thunder | 
| Length: | 206.0000 mm | 
| Letter: | H | 
| Manufacturer: | Aerotech | 
| Name: | H550 | 
| Peak Thrust: | 643.3720 N | 
| Status: | In-Production | 
| Thrust Duration: | 0.5790 s | 
| Total Impulse: | 310.2289 Ns | 
| Total Weight: | 316.0000 g | 
| Type: | Single-Use | 
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