Removing the top compression disc can be a problem. A small screw hole was tapped into the disc. After removal of the screw, the disc is easily removed by injecting compressed air into the screw hole.

https://www.youtube.com/watch?v=ci6y1iiOP_w

https://youtu.be/HOxXuyXIHAg

Succesful test, however plateaus less well defined.

https://youtu.be/_7c2rc-XI5g

Atmospheric burn rate test of new dual oxidator propellant.  Burn rate 0.1 inch/s or 2.7mm/s.

https://www.youtube.com/watch?v=U28UGygpku8

Second test with AN propellant, standard composition, higher Kn, nozzle 4mm (5mm in previous experiment).

https://youtu.be/hDdhHhS0F5M

The Chiron logo was cut from high gloss adhesive plastic and carefully positioned on the recovery section of the rocket.

Also in the picture is the 3d printed mobius camera shroud. The lens cap is equipped with a fluorescent string to indicate its presence (you would not like to forget the lens cap during a launch).

First test using AN as oxidizer.

Low pressure/ long burn/ pulses

oxidizer too coarse?

https://youtu.be/KPNCzUqkFDk

Same as test #3, but now surface of propellant was smoothed on the lathe, resulting in a near perfect pressure profile.

https://youtu.be/umumjultjDI

https://www.youtube.com/watch?v=zU3Rtuvd3dw

APCP test #2

diameter #1 67.44mm

diameter #2 51mm length 21.45mm

nozzle 5mm