>>501
Btits are saying it's a demonstrator engine

..And they mean what they say
https://defensehere.com/en/HaberDetay/rolls-royce-to-develop-joint-future-fighter-engine-demonstrator-with-ihi-corporation/1

The Industry teams in both UK and Japan bring complementary technologies that will drive cleaner, next generation power and propulsion for both nations future fighter

requirements.