a lot people dream convertible call cabriolet some convertible do not roof vulnerable rain this Melon ask famous inventor decide create rain protection mechanism convertiblesthe workplace mechanism plane driver its functional consist rail slide endpoint piece stretch rope for sake simplicity consider pair parallel segment plane rope segment endpoint free choose point rail segment the algorithmic mechanism detect particular raindrop predict reach plane at exact moment rope segment contain raindrop point rope adsorb raindropyou give initial position rope endpoint information raindrop you choose minimal possible speed v endpoint slide endpoint slide direction segment independently way possible catch raindrop move endpoint speed great v find impossible matter high speed