< Serge77 - My Rocket Workshop >

KNO3: reagent grade "pure for analysis". Moisture content 0.1-0.2%. It was milled with coffee mill, crystals measured 50 microns to 300 microns.

Sorbitol: pharmaceutical grade. Moisture content 0.2-0.3%. Granules measured 200 microns to 600 microns. There are also much smaller particles in the mixture.

Four metal rods 1m height were placed at 1m distance from each other for the scale purposes.

Sheets of office paper were pinned on the ground at 0.5m distance from each other.

1 kg batch of thoroughly mixed powdered propellant mixture was ignited in aluminum pan by electrical igniter at the top surface.

 VIDEO, 3.5 MB

 VIDEO, 2.2 MB

Propellant depth 60 mm.

Burn time 25 s.

Burn rate 2.4 mm/s.

Fireball height is about 1 m.

The maximal scattering of burning propellant drops was 1.5 m downwind, 0.5 m upwind, 1 m at other sides.