The design intent of this engine was to develop a simple turbofan upgrade that could be added to a basic turbojet core that I previously developed.
This engine was built on the gas-generator core of my previous kerosene centrifugal turbojet. I machined the aft fan out of a single alloy steel plate with a pressed in (and radially pinned) stainless steel inner turbine. The furthest aft fan bearing assembly was total-loss water cooled with a small amount of pressurized water.
Overall, the engine ran well and worked as a two-spool turbofan. At the end of testing, fan turbine thermal distortion caused the fan turbine and fan hub to separate causing fan imbalance.