Скачать или смотреть F-Class rocket motor static fire (Failure)

After various nozzle blowouts on my other rockets I tried to make another nozzle with air dried clay, the nozzle held up surprisingly well, but I somehow failed to realize that a small gap was left on the top of the motor. This gap leads to the grain starting to burn not only on the core, but also on the top surface, this quickly overpowers the cardboard casing and in around 1.5 seconds blasts straight through it as you would expect extremely hot propellant to do, this also blasts through the aluminum reinforcement and melts it in less than a second. The solution I am planning to test is quite simple, and it is just to make a seal similarly to my past nozzles, with the air dried nozzle on the top. That way there is no surface burning for multiple seconds directly on contact with cardboard, and hence hopefully the casing would survive just as well as before.