...is intended to be the counterpart,equivalent of the well known air/water screw concept(blades propeller),but this time in a direct interplay with the inertial property("frame") of space.When we "screw" air or water,so to move inside the fluidic medium,in reality we interact with the inertial property of this environment,because "deeper" of this ,it's the same elementary inertial frame.So,the game with inertia has two rules:you stay,I stay and you act,I react(be carefull to velocity and straight,uncurved line/trajectory).Thinking about the transmission of light in the Universe,it seems that inertia has a so great sensibility and diversity regarding reactive features,characteristics.A very great co-partner in any of our action,movement.Now,because  www.inter-corporate.com is hibernating(so it seems...),the direct connection to a proposed design for a rotary pulsing "screw",you can find at   www.geocities.com/iacob_alex/Stellarotor.htm   click on New!New Drafts! Fig 14 . It can be a suggestion for people interested in this topic.Usually,the more you give,the more we have together.All the Bests!/Alex