Ok, I tested some more rockets this weekend and they all worked nicely
They where the same in dimensions as the earlier rockets except I cut them in half this time so they where about 5-6 cm long and I also made the nozle 0.5mm smaller so it was 3 mm now.
I also made the cores smaller but with two rockets it was too small so they didn't ignite :cry:
Me and a friend made 9 rockets wich all flew this time (exept two) with no cato-s at all.
Three rockets had aluminium powder mixed with the meal powder so they left a nice trail of sparks in the sky when they flew. They only looked like they had a little less thrust than the regular meal rockets but they still got high enough.
I also made three rockets with a payload (one of them was one of the rockets wich didn't ignite) but because I still don't have suitable sticks my rockets where not as balanced as they should be.
So, the rockets with the payloads flew more to the side then upwards but since we were on our testing area it was not a problem.
The payloads consisted of legaly bought firecrackers (bermuda triangels). I know they aren't good for aerodynamics but they where good enough to experiment with.
Ok, that's it for now. My charcoal stash is gone so I'll first have to find/make some new but that won't take all too long and otherwise I can experiment with candy rockets.
I also recorded some rockets flying around so I'll try and post the vids this afternoon.
Pirate