System.out.printf(" Total impulse: %.2f Ns\n", m.getTotalImpulse());
System.out.println(" Diameter: " + m.getDiameter()*1000 + " mm");
System.out.println(" Length: " + m.getLength()*1000 + " mm");
+ System.out.println(" Digest: " + m.getDigestString());
if (m instanceof ThrustCurveMotor) {
ThrustCurveMotor tc = (ThrustCurveMotor)m;