[8][9] The launch vehicle is composed of a set of liquid fuel engines clustered as concentric toroids attached to the central payload.

By using propellant crossfeed, all available engines will fire simultaneously but only the fuel tank in the outermost stage will be depleted at a time, increasing performance.

[10][8][9] Due to their high-altitude-only use, much lower combustion chamber pressures are required and thus a simple pressure-fed engine design is used, substantially reducing cost and complexity by omitting turbopumps.

According to López Urdiales, the Bloostar rocket launch vehicle "has been designed to be reusable, technically, but not as part of the business plan.

"[13] Recovery will be attempted, however, and consideration has been given for an eventual system by which the first stage will descent top-down, using a portion of its dorsal fairing as an ablative heat shield, and slow to be caught in a sea-based net.

The first flight test was successfully conducted in March 2017, in which a less-than-half-scale prototype of the upper two stages was carried to 25 km altitude by balloon, separated, made a short burn using a small solid motor, and then was recovered intact by parachute.

[8] However, López Urdiales subsequently noted this date could potentially slip as Zero 2 Infinity focused on its revenue-generating Elevate product line.

[10] Bloon is a zero emission craft in development, which consists of a high-altitude balloon-borne capsule to perform crewed flights to near space and a steerable parachute system for returning autonomously to Earth.

It also refers to the balloon-borne craft prototype range of the same company: Bloon, Minibloon, Microbloon and Nanobloon, which are differentiated among them by their size.

The goals of the mission were: (i) validation of the telemetry systems in Space conditions, (ii) controlled ignition, (iii) stabilization of the rocket, (iv) monitoring of the launch sequence, (v) parachute deployment, and finally, (vi) sea recovery.