a methane/liquid oxygen rocket engine Masten Space Systems was developing for the US government. Advanced manufacturing techniques would permit the engine to be used to provide a lower-cost reusable launch service for the growing CubeSat and smallsat launch market. The prototype engine took 1.5 months to construct and was made of aluminium. The engine consisted of 3 parts that were bolted together. The engine used an expander cycle and was planned to produce with a bell extension in vacuum. The development of a technology demonstration unit was completed in September 2016. The hot-fire test campaign concluded with the demonstration of six successful engine starts. , a second development unit containing enhancements was being developed for NASA under the Tipping Point program with the aim of being flight qualified. Cutlass Cutlass was a methane/liquid oxygen rocket engine Masten Space Systems was developing for the US government. Built using aluminium alloy via additive manufacturing techniques. Cutlass evolved into a low cost expendable upper stage engine using a gas generator cycle. A Phase 2 SBIR grant was not awarded so development was put on hold. Katana Katana class engines were designed to produce up to of thrust and to be regeneratively cooled. They were designed for indefinite runtime and good throttle response. A video of the all aluminium Katana KA6A Regen 2800 lbf engine's shake down test burning LOX/IPA (Isopropyl alcohol). Machete Machete was the name for a family of throttleable rocket engine designs Masten Space Systems was developing to permit their XL-1 lunar lander to land on the Moon. The Machete rocket engines burned the nontoxic storable hypergolic propellant combination MXP-351. The first Machete had an experimental injector design that was used to test MXP-351 in 2016, producing a thrust of 225 lbf. , Masten was modifying the design to make the engines additively-manufactured with regeneratively-cooled thrust chambers. Machete engines were being scaled up to produce 1000 lb thrust for a terrestrial test-bed version dubbed (XL-1T). MXP-351 MXP-351 was Masten Space's internal name for a self-igniting bipropellant combination invented to fuel its small lunar landers. Unlike the traditional NTO/MMH bipropellant, the two propellant chemicals in MXP-351 were safer to handle because they are nontoxic. The bipropellant could also be stored at room temperatures, unlike liquid oxygen and liquid hydrogen. The hypergolic combination had an ISP of 322 seconds. The storage life of MXP-351 before use was undergoing long-term studies but was expected