Guys I'm at a loss here, back in 0.90 I used almost exclusively the Thermal Rocket and Thermal Turbojet engines in combination with antimatter / antimatter reactor and LFO tanks and they pretty much took me anywhere I wanted, now with KSPI 1.5.5 I can't seem to get either of those engines to work. The following setup always used to work with the Thermal Rocket/Jet engines now it just doesn't, any ideas would be very much appreciated, am I missing something? The engine only produces 35kN at full throttle? That can't be right. In this test rig I have a filled antimatter containment device, an antimatter reactor, the rocket stuck to that reactor, an electric generator, an LFO tank and a heat dissipator, everything is active and working, yet next to no thrust.