Month: April 2025

This was a quick design study that I did to flush out the details of a 200-pound thrust turbojet that I was designing in the background for several years. This engine incorporates a medium compression ratio centrifugal compressor and a reverse flow annular combustion chamber with high pressure fuel injection. The intent was to design an engine with a layout and packaging that could be practical for small aircraft applications. The engine has high pressure recirculating oil and an integrated starter generator in the nose.

This is a small 110 lb thrust prototype turbojet engine design that I have been iterating on the side for some years.  I recently decided that I’d give it a little more thought and attention.  It’s in the same thrust range as my previous JA103 turbojet engine, but it is physically smaller and the deign details are a bit more refined.  The design also takes advantage of new manufacturing methods that I did not have experience with during my previous JA103 build. At this time, I’m not sure if I will build this engine or not as I have several other engine designs in work.