DARK test motor nozzles x 20

Last week, twenty new stainless steel nozzle blanks arrived from Kais Maskinfabrik for the DARK solid propellant characterisation motor. The design was prototyped last month.

DARK test motor nozzle blanks

In the near future the graphite nozzle inserts will be bonded into the nozzle blanks in preparation for machining the internal nozzle shape.

The next step is to determine the desired range of nozzle throat diameters and the maximum relative step size between successive nozzle sizes. From this we can construct a table of standard nozzle sizes, in much the same way as standard resistor values.