now, planes were getting bigger, by 1910, an unknown enthusiast named glen curtis was building and flyinghibians. by 1914, the fledgling army air service had expanded to several dozen planes. at first, planes were used only for aerial reconnaissance. but in time, bombs and then machine guns were added. pilots who had once waved at each other as they passed now shot to kill. these were the days of the lafayette drill and flying circus. americans learned new words, the span, the jenny. with the end of the war, numerous new experimental planes appeared. and a new kind of scientist emerged. the aeronautical engineer. there was even a new kind of aircraft, it was called a helicopter. by the middle 1920s, there was no doubt the helicopter would fly. the only question was, in which direction? some early four-bladed copters actually hovered. while others only bounced. before long, however, there was evidence enough that the helicopter was here to stay. now man was finding first one method and another of flying where for thousands of years he had been able to do little more than watch the birds an