Our engine is intentionally boring.

E2 is a LOx/RP, gas generator cycle, turbopump-fed engine– tried-and-true choices that enable design simplicity and reliability. 9x E2 engines power Stage 1 and 1x E2 engine powers Stage 2. Designed, manufactured, and tested in-house, E2 exemplifies the ABL design philosophy. The Saturn V flew with gas generator cycle engines, and so does RS1. ABL intentionally chooses mature architectures to minimize development time and scope, freeing us to obsessively focus on design for manufacturing and operations.

We combine traditional and additive manufacturing for a purpose-built approach. For components that require complex internal fluid passageways – including our E2 thrust chamber and turbopumps – we 3D print near-net parts in high performance alloys and post-machine them to completion. For parts that don’t, we use well established forging and machining methods to optimize cost, lead time, and reliability. This simplicity results in an engine that can be rapidly manufactured and assembled to meet our customers’ needs.