only to the extend that the Al powder in the motor is burning in the O2 released from the perchlorate, it'[s not an exchange like a traditional thermite Essent

only to the extend that the Al powder in the motor is burning in the O2 released from the perchlorate, it'[s not an exchange like a traditional thermite Essentially they add Al because it burns well and has a high mass which ups the mass of the exhaust gasses and as a result gives you more thrust