If an unintended crack develops in the propellant grain of a solid motor during flight, what is the likely catastrophic result?

Answer

The resulting increase in surface area causes an immediate and uncontrollable surge in thrust and chamber pressure.

A crack exposes more propellant surface area to combustion, rapidly increasing the rate of burn, leading directly to excessive thrust and pressure that often destroys the motor casing.

If an unintended crack develops in the propellant grain of a solid motor during flight, what is the likely catastrophic result?
disadvantagesrocket fuelhazardspropellantcombustion