That was a whistle rocket captured immediately after takeoff

That was a whistle rocket captured immediately after takeoff. It has achieved a flight altitude of 300 m. The payload was about 100 g of stars.

Here is the second one also captured immediately after take off. You can see the flame is very bright. The noise was also very good.

This are those rockets with whistle fuel you can see a little reddish fuel because of ferric oxide. The cavity inside was 5 mm ID and 15 mm in length. ID of a tube is 16 mm. These rockets were pressed in a 1500 kg press.

Potassium perchlorate	70
Sodium Benzoate	30
Fe2O4	+3%

Here you can see what happen if you choke a central cavity to much. I use black match and I have secure it on place with NC/meal slurry. There was a violent CATO with results that you can see. Some of a fuel didn't burn in an explosion.

This is the same tube showed from a different angle. You can see what would happen if I would be somewhere near.

You can see CATO at this picture the upper part is a stick with a rocket. A rocket was BP /ID 16 mm/N5 mm/C22 mm. It looks like that the core was too long for that batch of BP.

This picture shows the recovered tube from the CATO rocket. You can see a ruptured tube.

Here it is first picture before flight of ID 20/N8/C10 with a fuel of unprocessed mixture with following formula. Mixture wasn't ball milled only simply mixed as green mix. The tube is 25 mm OD and the clay nozzle. I use my own clay from the land where they use to dig clay for a bricks. Nozzle is 20 mm long and the upper end plug is the same size. It is the same design as in 1 lb rockets in BAFN 2.

KNO3 milled in a coffee mill	16
Charcoal 0.3-1 mm	12
Sulfur	3

And here it is a takeoff of upper rocket. I first have problems with the blowing off top plug but after rolling enough long tubes so that the composition was also about 3 cm p from the core those problems vanished. As you can see on this picture and on a new one it produces very nice tail. But it seems that I will have to add first increment of fuel from BP to increase the power in a first second so that this tail will be in a motion. On the next picture you will se the tail from another takeoff. The mass of a rocket was 289 g with a 2" shell attached on a top (shell was 150 g). The height of a flight was approximately 300 m. You can see a rocket before flight with a shell..