Reply To: Model Turbines

[Turbine GuyParticipant @turbineguy]

The first oversize of the Cover 5 nozzle changed the bore from 0.038” to 0.040” and dropped the maximum speed 500 rpm so increasing the nozzle bore size didn’t help. I made a nozzle shown in the following drawing and measured the maximum pressure my TC-95T airbrush compressor was able to supply for each change in bore size as shown in the chart below. I had done this for my airbrush compressor TC-20 and it allowed me to find the maximum energy available energy available. It turned out that the optimum nozzle size of Cover 5 was the size that gave the maximum available energy. When I did this with my TC-95T airbrush compressor it turned out that the nozzle sizes from 0.037” to 0.039” gave the maximum available energy so increasing the nozzle size to 0.040” decreased the available energy slightly. Apparently the 0.039” nozzle size gave the best performance I can get for Drag Turbine 4 using the TC-95T airbrush compressor and didn’t beat the performance of Drag Turbine 3.