Two-spool turbofan.
AgentJayZ also comments.
The fuel tank is 2.5liter (absinthe, grenadine??).
The designer/builder wrote that fuel consumption is high(er) because too much fuel was used to lubricate the bearings:
www.rc-network.de/forum/showthread.php/727090-Effizienteste-Turbine?p=4754549&viewfull=1#post4754549
Static thrust a little over 12kg, the core is KJ66 based (8kg):
translate...www.rc-network.de/forum/showthread.php/727090-Effizienteste-Turbine/p=4755001
Channel
www.youtube.com/channel/UCvdOgVvlsngJ9oTP4BVckfA