The H300 is a 2% H unknown composite motor from Contrail.
| Average Thrust: | 262.7440 N | 
| Certified By: | Tripoli Rocketry Association | 
| Class: | 2% H | 
| Delays: | 1000 seconds | 
| Diameter: | 38.0000 mm | 
| Length: | 516.0000 mm | 
| Letter: | H | 
| Manufacturer: | Contrail | 
| Name: | H300 | 
| Peak Thrust: | 717.2330 N | 
| Propellant: | APCP | 
| Status: | In-Production | 
| Thrust Duration: | 0.6200 s | 
| Total Impulse: | 162.9010 Ns | 
| Total Weight: | 612.0000 g | 
| Type: | Unknown | 
|  |  |