JetZero has just announced it has chosen the legacy Pratt & Whitney PW2040 engine to power its demonstrator that is planned to fly in 2027. Ambitiously, JetZero plans for the blended-wing-body (BWB) ...

Its four Pratt & Whitney JT9D-7R4W or Rolls-Royce RB211-524C2 turbofan engines gave it the 747SP a cruising speed of Mach 0.88, but it could fly as fast as Mach 0.92 with 46,500 pounds of force.