A complete 1 N HPGP propulsion system was delivered to SSC for flight on the Prisma satellite project.

Structured on COTS components with extensive flight heritage, the HPGP system on Prisma has successfully demonstrated a mission-average 8% higher performance than the hydrazine system flown on the same satellite. The two Prisma formation flying satellites were launched in 2010.


ECAPS was selected to provide nineteen complete 1N HPGP propulsion system modules for Planet’s constellation of SkySat Earth observation satellites.

SkySat-3 was the first of the SkySat satellites to be equipped with orbit maneuvring capability provided by HPGP. A total of five SkySat satellites with HPGP systems have been operational in orbit since 2016, and six additional SkySat satellites with HPGP systems will be launched from Vandenberg AFB in 2017.

Planet’s SkySat satellites empower global businesses to make better decisions with timely, sub-meter color imagery and high definition video of the Earth. The HPGP systems provide the SkySat satellites with more than double the on-orbit delta-v compared to the other monopropellant systems considered during Planet’s procurement. In addition, the handling and safety advantages of HPGP provide the lowest life-cycle cost of all liquid propulsion technologies that were evaluated.

The on-going serial production of HPGP systems for the SkySat satellites allows ECAPS to offer the existing system design, or derivatives thereof, as an off-the-shelf solution for other satellites with similar needs.