Control of variation of delay time from ignition to launch in ETC gun

Control of velocity of projectile is focused in conventional ETC gun researches. On the other hand, we pay our attention on variation of delay time from ignition signal to launch of a projectile at a muzzle. Our final goal is to reduce this variation as small as possible by combination of charged voltage and inductance of coils in a condenser bank of 10 kJ. At the first step, we conducted two kinds of experiments. The one is a discharge experiment and the other is an ignition examination. We measured current and discharge voltage profile in the discharge experiment. The mixture of NH₄NO₃, Al powder and polyoxymethylene was used as a propellant. And we measured projectile velocity and delay time in the ignition experiment.