This rocket was designed expressly for the Aerotech H45-WL motor, one the Great Model Rocket Engines, in my humble opinion, though often overlooked. It's a perfect balance of a very useful average thrust level, 45 n/sec, and relatively long thrust duration (at 7.1 seconds). A great choice even for a medium-sized rocket like my Phantom 4000, its performance in this near-minimum-sized rocket was astounding!