The Mortar Headd Mainframe aka The Keel (Mortar Headd’s backbone)

Fatima Shell Installation Frame

For a MH, the fatima shell is a critical component. This frame is secured to the keel (Mortar Headd’s backbone) to support it. Data and control output from the fatima go inside the keel to be transmitted throughout the body. See Fatima Cockpit.

At the point where the scapula (shoulder blades) connect to the keel there are installation openings for ezlaser engine energy bypasses. The energy transmitted through the keel passes through these openings to power other sections. See Ezlaser Power System.

Scapula (Shoulder Blade)

Built to be extremely robust, they support both arms while securing them to the clavicles. They accomplish the essential movement of raising the shoulders when spreading the arms or wielding a sword held forward in both hands.

Bottom Counterweight

A weight to balance the upper and lower halves of the body. When Mortar Headds have special back-mounted equipment it also functions as an adapter, but this doesn’t see much use.

The protrusions on the pelvis function as a support frame for the power pistons.

Thigh Bone Pelvic Socket

Even among the toughest parts of a MH, this is the most critical. The ball joint is filled with a damper liquid sealed under high pressure. Unequipped with internal power, it is dedicated solely to securing the femur.

The individual parts of the keel itself maintain a certain elasticity, allowing the flexible movement in all directions even without a tendon system. The basic elastic, twisting movements of a MH all take place in the keel. Of course, there are ones with linked dampers and pistons in the abdomen for support as well. See illustration for Driving System.


A large block part that supports the pelvis and keel. Cam connections with the other parts make extremely flexible movement possible. As one of the stronger parts, it also serves as a mounting point for waist armor.