Sinclair Interplanetary

Sinclair Interplanetary, founded in 2001 by Doug Sinclair and headquartered in Toronto, Canada, pioneered the commercial market for high-reliability vacuum-lubricated reaction wheels for pico, nano, and microsatellites — developing the world's first catalog reaction wheel products specifically engineered for the reliability constraints of unserviceable small satellite missions where bearing failure would mean total mission loss.

Sinclair's reaction wheels use vacuum-compatible lubrication systems (rather than conventional greases that outgas and degrade in vacuum) enabling reaction wheels that can operate reliably for multiple years in the space environment without the bearing wear that plagued early small satellite momentum wheels. The company's signature RW-0.03 reaction wheel — 5×5×4 cm, 185 grams — provides momentum storage in a package compatible with 1U and 3U CubeSat volume budgets, achieving the three-axis attitude stabilization needed for directional antennas, Earth-pointing sensors, and optical communication terminals.

With 76 wheels deployed on orbit and a claimed 100% on-orbit success rate, Sinclair Interplanetary's reliability track record became the benchmark against which new reaction wheel entrants are measured — a critical differentiator in a market where satellite operators have zero tolerance for ADCS failures that would make a satellite unable to point its payload. This record was built through rigorous testing, lubricant selection, and bearing pre-loading techniques that Sinclair shared through academic publications, contributing to the field's technical knowledge base.

Rocket Lab acquired Sinclair Interplanetary in 2020, integrating Sinclair's ADCS components — reaction wheels, star trackers, magnetorquers, and sun sensors — into Rocket Lab's satellite components division that serves both external customers and Rocket Lab's in-house satellite manufacturing (Photon bus) programs. Under Rocket Lab, Sinclair's component portfolio continues expanding, leveraging Rocket Lab's global customer relationships and manufacturing scale while maintaining the engineering culture that produced the company's reliability reputation.