Concept design; TRIZ (Teoriya Resheniya Izobreatatelskikh Zadatch ) Principle 13. “The Other Way Round”A - Invert the action(s) used to solve the problem (e.g. instead of cooling an object, heat it) To loosen stuck parts, cool the inner part instead of heating the outer part. Vacuum casting Test pressure vessel by varying pressure outside rather than inside the vessel Test seal on a liquid container by filling with pressurised air and immersing in liquid; trails of bubbles are easier to trace than slow liquid leaks Place nuts in a vacuum to get them out of their shells “Upside-down” motorcycle forksB - Make movable parts (or the external environment) fixed, and fixed parts movable) Hamster wheel Rotate the part instead of the tool. Wind tunnels Moving sidewalk with standing peopleC - Turn the object (or process) upside down Clean bottles by inverting and injecting water from below; the water then drains by itself. Turn an assembly upside down to insert fasteners Open tinned beans from the bottom to get out beans that would otherwise have stuck to the bottom due to storage Module SESA3002a; Aerospace Design 15