RATLOG debuts turbopump-free rocket engine out of Y Combinator

what happened

Dresden-based startup RATLOG debuted in Y Combinator's Fall 2026 batch, per Payload. The company's engine eliminates the turbopump and instead builds pressure by rotating the whole engine, a design founder and CEO Charlie Weise says cuts about 90% of a conventional rocket engine's parts. RATLOG says it built and hot-fired its first prototype within four months on an initial 30,000-euro German government grant, then joined Y Combinator weeks later, per Payload and TU Dresden, where the four founders studied. The rocket targets Falcon 9-class specs with a wider fairing, and RATLOG says it has letters of intent from customers, mostly orbital data center and constellation companies, per Payload. The company targets a complete flight-ready engine by 2027, a hopper test in 2028, and a first launch in 2029 or 2030.

why it matters

RATLOG is one of a small number of launch startups proposing a fundamentally different engine architecture rather than an incremental variation on existing designs, in a market where new entrants are otherwise competing on fuel choice or materials. Its stated timeline puts a first flight years out, and the test-and-funding record so far is small relative to the vehicle class it is targeting, but it is an early marker for operators and constellation builders tracking which new launch providers might reach Falcon 9-class capacity later this decade.

signal-to-noise

quick facts

Companies

RATLOG

Category

product

Impact

noise

SNR

4 / 5

Event date

2026-10-16

Published

2026-10-16 17:32 UTC