Rocket Engines

IST uses liquid fuel for its full range of rockets.
Liquid fuel offers superior performance, improved safety, and lower costs than solid propellants.
All of IST’s engines are designed, tested, and built in-house.


Engine Lineup

Our current line up consists of two engines:
・12 kN thrust engine for our MOMO sounding rockets
–LOX-Ethanol propellants, pressure-fed cycle

・60 kN thrust engine for our ZERO orbital rockets (under development)
–LOX-LNG propellants, gas-generator cycle
–Regeneratively-cooled chamber


Pintle Injector

The core component of any rocket engine is its fuel injector.
Pintle injectors are known for their ease of control, superior injection performance, and low manufacturing costs.
IST, in conjunction with the University of Tokyo, has developed the latest in pintle injector technology, greatly increasing engine efficiency and minimizing vehicle size.
Pintle injectors were first used for the Apollo Lunar lander but fell out of fashion as larger rockets became the norm. In recent years, however, they are making a comeback, being incorporated into major engines such as SpaceX’s Merlin engines.
*IST’s avionics testbed uses conventional injectors.

conventional injector


Design and Materials

Our design and choice of materials are driven not simply by performance but also by ease of procurement and cost.
The majority of our major components are fabricated in-house, using the optimal mix of legacy and latest manufacturing methods, as well as easily available materials.
Innovation is at its finest at IST, striving to minimize costs in any way possible whilst maintaining reliability.


Kaizen, test, repeat—at unparalleled rates

We conduct tests. Countless tests.
In-house fabrication of components allows us to rapidly execute our kaizen & test process.
Conduct tests, perform analysis, and practice kaizen. By the very next day, we are ready to test the newly improved component.
This is IST.