Built in a garage. Collected on the playa.

The O-motor airframe, and the reinforced answer to ION 4.3. On the September 2025 test flight at Black Rock, ION 4.3 modelled 46,949 feet and returned 16,060: the unreinforced nose cone failed at max Q and the vehicle departed to 62.9° by burnout. ION 4.4 flies a Kevlar PVC-matrix reinforced nose cone against the same O5500X, with redundant Featherweight Blue Ravens, a CO₂ drogue ejection backed up by black powder, an 18-inch drogue and a 60-inch Iris Ultra main. It goes to the rail at XPRS this September.

The airframe that answers ION 3.1, and not yet flown. ION 3.1 was lost when its carbon fiber ebay blocked the tracker; ION 3.2 carries a fiberglass ebay with the Featherweight GPS moved forward into the nose cone. Modeled on an N2700W-PS at 38,222 feet and Mach 2.7, it goes to the rail at XPRS this September.

The Level 3 certification vehicle, flown for certification as Dicarbon. A minimum-diameter carbon booster with no centering rings, CNC-cut carbon fins surface mounted and reinforced tip-to-tip with triaxial carbon in a wet layup, and a filament-wound fiberglass nose cone with an aluminium tip — fiberglass so the GPS tracker inside isn't sitting in a carbon Faraday cage.

First of two 38 mm prototypes. Small, dense, and built to go through the sound barrier on a single motor — a carbon airframe on a two-and-a-half foot body with black powder separation and a Piranha main release. The cheapest way to learn what transonic drag actually does to a design. It flies at XPRS this September.

The second 38 mm prototype: the same minimum-diameter envelope as ION 38.1, stretched four and a half inches and flown on three swept carbon fins instead of four. On a J510W the model puts it 200 feet higher than ION 38.1 while pulling 78 g instead of 104 — the same job done with a longer, gentler boost. Running the two against each other is how fin count and fineness stop being numbers in a simulation.

The two-stage prototype: ION 4.4 flying as the booster under ION 3.2 as the sustainer, joined by an eight-inch transition from 98 mm down to 75 mm. Twelve and a half feet on the rail. On an O5500X lighting an N3120X-PS the model reaches 75,245 feet — fourteen miles, and the first vehicle in the programme whose apogee is measured against the hundred-thousand-foot mark rather than the waiver. It is a 2027 project, and it does not get built until ION 4.4 and ION 3.2 both fly successfully in 2026.