Worst practices… The recent growth of Chinese upper stages has been driven by the country’s increased launch rate as it begins to deploy satellite megaconstellations, Shell said. China’s space industry is just at the beginning of launching megaconstellations to compete with SpaceX’s Starlink satellite service, suggesting that if the country does not curb this practice it will deteriorate an already congested space environment. Chinese constellations such as Guowang and Spacesail are typically at higher altitudes, above 800 km, and China may launch 1,000 or more rockets over the next decade to support these constellations. That’s a lot of new junk if the trend continues.
DARPA, Voyager team up on solid rocket motors. The Defense Advanced Research Projects Agency (DARPA) has awarded Voyager Technologies a $16.5 million contract to continue development of a solid rocket motor thrust-control technology designed to make missile propulsion systems more adaptable across different missions and weapons programs, Space News reports. The contract is part of DARPA’s “Burn n’ Go” program. Solid rocket motors are used for a wide range of applications, from tactical missiles to space launch vehicles. The upside for solid rocket motors is their reliability and manufacturability. Solid rocket motors can vary their thrust, but these thrust profiles are predetermined by propellant grain patterns and the dimensions of the motor. In other words, the thrust profiles are locked in once the motor is manufactured. Unlike liquid-fueled rocket engines, solid-fueled rockets typically can’t be throttled up or down on the fly.
It’s in the propellant… Voyager is working with DARPA on a new “propellant-embedded” method of controlling the thrust of solid rocket motors after they are manufactured. The recent contract is for Phase 2 of the Burn n’ Go program. During Phase 1, Voyager worked on architecture concepts and preliminary designs. Voyager’s Phase 2 contract will culminate in “tailorable SRM hot-fire demonstrations,” the company said in a press release. “This award reflects confidence in our ability to translate advanced propulsion technologies into field-ready capabilities that support US national readiness and deterrence,” said Matt Magaña, president of space, defense, and national security programs at Voyager. “Our approach is designed not only to demonstrate performance gains at the system level, but to establish a credible path to industrialization that can reshape how solid rocket motors are produced, mission tailored and controlled.”