Nozzle Test _

 

I decided to put the nozzle to the test on a Kn/Sorbitol engine and the results turned out remarkably good. Unfortunately the hydraulic test stand being used to register the performance of the engine broke on the previews test, still the images and video attest to it's performance.

 

Engine design parameters
Materials -
1.5" PVC Sch 40
Inside diameter -
 38 mm = 1.5"
Case length -
 380 mm = 14.96"
Bates segments (5) -
 75 mm = 2.95"
Core diameter -
 12.7 mm = 0.5"
Throat diameter -
 11.07 mm = 0.43"
Pressure -
707 Psi = 4.88 MPa
Max. Thrust -
 148 lb = 659 N
Average Thrust -
 129 lb = 575 N
Thrust duration -
 1.5 sec.
Total Impulse -
 865 N
Propellant mass -
 0.668 Kg. = 1.47 lb
Class -
J
Kn -
260

On the actual engine a sixth segment was added as a delay charge or smoke tracking alternative. Note that this segment did not have a core.

The propellant is cast into brown cardboard paper and the PVC case is insulated with PVC liner.

Here is the video of the test:

 

And this is what the nozzle looked like after the test:


All in one piece with no apparent erosion or failure.


Me after the test!

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