Initiation systems for explosive devices, scalable output explosive devices including initiation systems, and related methods

A method of igniting a warhead, the method comprising:

• deflagrating a portion of the explosive material disposed within a projectile warhead comprising an elongated housing having a forward end at a first longitudinal end of the elongated housing and an aft end at a second longitudinal end of the elongated housing opposing the first elongated end of the housing, the forward end configured to form a frontmost portion of the projectile warhead during travel of the projectile warhead through air, the aft end configured to form a backmost portion of the projectile warhead during travel of the projectile type warhead through air, wherein a length of the elongated housing extending between the forward end and the aft end is greater than a width of the elongated housing extending in a direction transverse to the length, the projectile warhead comprising:
• an explosive material disposed within a housing in the warhead;
• and
• an initiator system disposed within the housing, the initiator system comprising:
• a first initiation device disposed proximate to the aft end of the warhead and configured to detonate at least a portion of the explosive material;
• and
• a second initiation device at least partially disposed in a cavity formed in the explosive material proximate to the forward end of the warhead and configured to deflagrate at least another portion of the explosive material of the explosive device;
• and
• detonating at least a portion of the explosive material disposed within the warhead with the initiator system.