Ursa Major Announces Storable Liquid Draper Rocket Engine For Hypersonics Defense

Ursa Major Announces Storable Liquid Draper Rocket Engine For Hypersonics Defense

Ursa Major, America's privately funded company that focuses solely on rocket propulsion, is excited to introduce Draper, a revolutionary new engine designed to defend against hypersonic weapons. Draper is a storable, 4,000-pound-thrust closed catalyst cycle engine that uses storable hydrogen-peroxide/kerosene propellant, making it ideal for small hypersonic defense vehicles that need to launch on demand. Draper contains architectural and manufacturing heritage from the Hadley engine, of which more than 100 have been built.

“Draper combines the reliability and portability benefits of a solid rocket motor with the higher performance and maneuverability of a liquid engine. Those qualities allow Draper to better simulate hypersonic threats as a target vehicle,” said Joe Laurienti, founder and CEO of Ursa Major. “Draper will allow America to leap ahead in hypersonic defense.” 

Solid rocket motors have traditionally powered the vehicles used for testing missile defense systems, but they cannot change thrust in real-time to actively throttle and respond to changing conditions. With adversarial hypersonic weapons becoming increasingly complex and erratic, a liquid rocket engine such as Draper provides active throttle control and throttle range, giving it the maneuverability and flexibility needed for hypersonic defense.  

Advantages of a Closed-Cycle Hydrogen Peroxide Engine  

  • Engine cycle maximizes performance and draws on the testing heritage of Ursa Major’s Hadley engine
  • Can be stored at room temperature for years to support on-demand launch.  
  • High propellant density fits more capability into space-constrained hypersonic vehicles. 
  • Hydrogen peroxide is a “green” storable propellant, which improves safety and reduces the risk of environmental harm compared to the toxicity of traditional hydrazine systems. 
  • Autoignition supports many restarts without a dedicated ignition system. 
  • Hydrogen peroxide can be used for attitude control systems (ACS) eliminating the need for additional ACS propellants. 

Like all Ursa Major engines, Draper’s components are largely 3D printed, which allows for rapid iteration during the development process and scaling of production to meet market demand. Ursa Major expects to fire the full Draper engine within 12 months.  In addition to Draper and Hadley, Ursa Major recently hotfired the 50,000-pound thrust LOX/kerosene Ripley engine and is developing the 200,000-pound thrust LOX/Methane Arroway engine.  

Ursa Major’s facility houses engineering, manufacturing, and testing on one campus. The co-location shortens development cycles and lower costs, creating an efficient propulsion innovation and production ecosystem. 

Click Here to Learn More About Ursa Major's Draper Engines.

Publisher: SatNow

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Satellite NameOrbit Date
BeiDou-3 G4Geostationary Orbit (GEO)17 May, 2023
BeiDou-3 G2Geostationary Orbit (GEO)09 Mar, 2020
Compass-IGSO7Inclined Geosynchronous Orbit (IGSO)09 Feb, 2020
BeiDou-3 M19Medium Earth Orbit (MEO)16 Dec, 2019
BeiDou-3 M20Medium Earth Orbit (MEO)16 Dec, 2019
BeiDou-3 M21Medium Earth Orbit (MEO)23 Nov, 2019
BeiDou-3 M22Medium Earth Orbit (MEO)23 Nov, 2019
BeiDou-3 I3Inclined Geosynchronous Orbit (IGSO)04 Nov, 2019
BeiDou-3 M23Medium Earth Orbit (MEO)22 Sep, 2019
BeiDou-3 M24Medium Earth Orbit (MEO)22 Sep, 2019


Satellite NameOrbit Date
GSAT0223MEO - Near-Circular05 Dec, 2021
GSAT0224MEO - Near-Circular05 Dec, 2021
GSAT0219MEO - Near-Circular25 Jul, 2018
GSAT0220MEO - Near-Circular25 Jul, 2018
GSAT0221MEO - Near-Circular25 Jul, 2018
GSAT0222MEO - Near-Circular25 Jul, 2018
GSAT0215MEO - Near-Circular12 Dec, 2017
GSAT0216MEO - Near-Circular12 Dec, 2017
GSAT0217MEO - Near-Circular12 Dec, 2017
GSAT0218MEO - Near-Circular12 Dec, 2017


Satellite NameOrbit Date
Kosmos 2569--07 Aug, 2023
Kosmos 2564--28 Nov, 2022
Kosmos 2559--10 Oct, 2022
Kosmos 2557--07 Jul, 2022
Kosmos 2547--25 Oct, 2020
Kosmos 2545--16 Mar, 2020
Kosmos 2544--11 Dec, 2019
Kosmos 2534--27 May, 2019
Kosmos 2529--03 Nov, 2018
Kosmos 2527--16 Jun, 2018


Satellite NameOrbit Date
Navstar 82Medium Earth Orbit19 Jan, 2023
Navstar 81Medium Earth Orbit17 Jun, 2021
Navstar 78Medium Earth Orbit22 Aug, 2019
Navstar 77Medium Earth Orbit23 Dec, 2018
Navstar 76Medium Earth Orbit05 Feb, 2016
Navstar 75Medium Earth Orbit31 Oct, 2015
Navstar 74Medium Earth Orbit15 Jul, 2015
Navstar 73Medium Earth Orbit25 Mar, 2015
Navstar 72Medium Earth Orbit29 Oct, 2014
Navstar 71Medium Earth Orbit02 Aug, 2014


Satellite NameOrbit Date
NVS-01Geostationary Orbit (GEO)29 May, 2023
IRNSS-1IInclined Geosynchronous Orbit (IGSO)12 Apr, 2018
IRNSS-1HSub Geosynchronous Transfer Orbit (Sub-GTO)31 Aug, 2017
IRNSS-1GGeostationary Orbit (GEO)28 Apr, 2016
IRNSS-1FGeostationary Orbit (GEO)10 Mar, 2016
IRNSS-1EGeosynchronous Orbit (IGSO)20 Jan, 2016
IRNSS-1DInclined Geosynchronous Orbit (IGSO)28 Mar, 2015
IRNSS-1CGeostationary Orbit (GEO)16 Oct, 2014
IRNSS-1BInclined Geosynchronous Orbit (IGSO)04 Apr, 2014
IRNSS-1AInclined Geosynchronous Orbit (IGSO)01 Jul, 2013