Hava ak\u0131mlar\u0131ndan yararlanarak u\u00e7an motorsuz hava ta\u015f\u0131t\u0131. Bu u\u00e7u\u015f arac\u0131n\u0131n u\u00e7aklardan
\nayr\u0131lan \u00f6zelli\u011fi motorsuz olu\u015fu ve ayn\u0131 zamanda \u00fczerinde herhangi bir hareket eden g\u00fc\u00e7 kayna\u011f\u0131
\nolmamas\u0131d\u0131r. Bundan dolay\u0131 pl\u00e2n\u00f6r, \u201cmotorsuz u\u00e7ak\u201d ve pl\u00e2n\u00f6rc\u00fcl\u00fck de, \u201cmotorsuz u\u00e7u\u015f\u201d diye
\nadland\u0131r\u0131l\u0131r.<\/p>\n
Havac\u0131l\u0131\u011f\u0131n ilk zamanlar\u0131nda hafif motorlar\u0131n olmay\u0131\u015f\u0131, geli\u015fmeyi engelledi ve havac\u0131lar u\u00e7mak i\u00e7in \u0130lk pl\u00e2n\u00f6r yap\u0131mc\u0131s\u0131 \u0130ngiliz Sir George Cayley, 1849 y\u0131l\u0131nda yapt\u0131\u011f\u0131 bir pl\u00e2n\u00f6rle Yorkshire\u2019de k\u00fc\u00e7\u00fck bir
\nmotorsuz pl\u00e2n\u00f6rleri kullanmak zorunda kald\u0131lar. Bu sebepten pl\u00e2n\u00f6r\u00fcn t\u00e2rihi motorlu u\u00e7aklardan <\/a>\u00e7ok
\ndaha eskidir.<\/p>\n
\n\u00e7ocu\u011fu u\u00e7urdu. 1853 y\u0131l\u0131nda da, arabac\u0131s\u0131n\u0131n u\u00e7mas\u0131n\u0131 sa\u011flad\u0131. Bundan sonra Frans\u0131z deniz
\nsubaylar\u0131ndan L\u00f6bri mart\u0131 ku\u015funa benzer bir pl\u00e2n\u00f6r yaparak, 1867 y\u0131l\u0131nda u\u00e7maya muvaffak oldu. Bu
\nyap\u0131lan \u00e7al\u0131\u015fmalar gelecek i\u00e7in k\u0131ymetli esaslar haz\u0131rlam\u0131\u015fsa da, u\u00e7u\u015f yapabilecek \u00f6zellikte bir ara\u00e7
\nim\u00e2linden uzak kalm\u0131\u015ft\u0131r. Bu yolda u\u00e7maya m\u00fcsait ilk ara\u00e7, Alman M\u00fchendislerinden Otto Lilienthal
\ntaraf\u0131ndan yap\u0131lm\u0131\u015ft\u0131r. Aerodinamik hakk\u0131nda bir\u00e7ok esaslar\u0131 kullanarak, y\u00fczlerce u\u00e7u\u015f tecr\u00fcbesi yapan
\nbu z\u00e2t, d\u00fcmenlerle plan\u00f6re havada y\u00f6n vermeye muvaffak olmu\u015ftur. Bundan sonra \u0130ngiliz Percy
\nPilcher pl\u00e2n\u00f6re bir ini\u015f tak\u0131m\u0131 il\u00e2ve etmi\u015f ve ini\u015fler tekerlek \u00fczerine yap\u0131lmaya ba\u015flanm\u0131\u015ft\u0131r.<\/p>\n