While not the fastest engine on the market (it only gives a speed boost of 7), the Shrieker uses a peculiar effect which physicists are still analyzing scratching their heads over in order to create low speed sonic booms which defy the rules of conventional Newtonian physics and regular aeronautics. Superheated air currents are pushed from the engine but circulate in particular ways within the thruster unit to create waves of unique pressures which propagate and amplify off of each other as they bounce against each other on their way out of the Shrieker's chamber. Those differences in air pressure create a cone of extremely high kinetic and thermal energy which results in the characteristic wail of a Shrieker Mark 2 engine. That however is merely an audible byproduct of the process. Before hearing the shriek you will physically see and experience the sonic boom created by this effect (one which manifests itself as a 6% trample bonus!). It generates a lot of energy but unfortunately not very much of it is used efficiently in providing thrust, which tends to be the main purpose of engines. That being said, the Shrieker Mark 2 remains fairly popular for other reasons.
To address this issue motor plants are hoping to have improved that efficiency by the time the Shrieker Mark 3 is ready for the market. In the meantime though, the good news about that is there is typically enough extra heat and furious sound energy produced by a Shrieker you can siphon a decent amount of it into powering your mecha's weapons systems to grant a 6% increased chance of double damage and 4% increased chance of triple damage. If you want to give your 65-85 Ton mecha some serious POWER, you can get one of these off the shelf for the price of 1532 Ferrite, 432 Bioptics and 45 niodes.
Submitted by Mycobacter #712744