 Both rockets use a single engine for their second stage and a cluster of engines (three in the Vector-R and six in the Vector-H) for their first stage, all of which use LOX and propylene as propellants.Vector planned to recover the first stage of its rockets for reuse.Other notable design features include a carbon fiber structure, some 3D printed engine parts, minimal infrastructure launch pads, and a fast launch cadence, which the company had hoped to reach 100 launches per year.