In recent years, Hybrid Rocket Propulsion has received significant attention as a candidate for space propulsion due to its safety, ability to throttle, ability to restart compared to solid rockets and low cost, simplicity and compactness compared to liquid propulsion. However, this technology also presents issues that have hampered its large scale adoption. One of the most important ones is the low and uneven regression rate of the solid fuel grain. The post-burn analyses of most fuel grains show a non-uniform regression rate along the grain length, with an increased consumption of the solid fuel at the upstream end of the motor.