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TheTechno Optimist.

QuarterhorseHermeus—QuarterhorseHermeus—

Hermeus

Hypersonic aircraft, Quarterhorse test jets

USprivateest. 2018hermeus.com (opens hermeus.com)Checked 25 Sep

The brief

Analyst view
  • Quarterhorse Mk 1 first flew in May 2025.
  • Quarterhorse Mk 2.1, about the size of an F-16, flew faster than sound (Mach 1.21) on 26 May 2026.
  • Builds a new aircraft for each step instead of one long program.
Programs

Hermeus, one program

Updated 9 Sep 2026
QuarterhorseA series of pilotless jets, each faster than the last. Later ones will test Hermeus's Chimera engine, which starts as a normal jet and switches to a ramjet at high speed.ProtoNextFaster flights and engine-switch testsUpdated 9 Sep 2026View program →
Research · Proto · Pilot · Deploy · Scaling

Peers

Supersonic & hypersonic · 1

Company & funding

HQ
US
Founded
2018

People

Key people
  • AJ PiplicaCo-founder and CEO
Primer