A “faster” BDO propellant was tested (66/8/2 AP, Al, CuO). Motor was ignited with 3g Mg, Al thermite, 2g BP and 7.9g APCP shavings. A 9s burn is a bit disappointing.

Post burn inspection showed a lot of slag on the nozzle. The throat was partially obstructed by this, reducing the diameter from 11.2 to approximately 7mm.

Despite a formidable flame and pressurization, the APCP grain did not ignite (3.5g BKNO3).

1.7 gram of B/KNO3 in a stainless steel mesh retainer to avoid particle expulsion.

Boron igniter test (0.5gram)

Successful test of a 12 point star core APCP motor. Relative flat thrust curve due to limited erosive burning and progressive geometry.

Because of the rain fall, a plastic bag was positioned over the nozzle.