Show limit to speed it is unlikely that airplanes will ever exceed a speed of miles per hour for at that speed 80 per cent of the speed of sound the resistance of the air could not be counteracted by increased engine power these were among the suggestions put forward at the british association meeting recently ever since the original or i I 1 wright machine reached the speed of 31 m p h in 1903 air speed has steadily dilys mounted as engines increased in power and aircraft shapes in streamlining the present record is m p h physically man could probably stand speeds far greater than m p h but however engines and aircraft designs are improved it seems likely that nature herself will impose the ultimate speed limit |