Kinesiology 2241A/B Lecture Notes - Lecture 21: Parasitic Drag, Wright Brothers, Leading Edge
15 Nov 2016
School
Department
Course
Professor
Document Summary
Wright brothers (same time motion camera came out) First depiction of machines that can fly: da vinci 1452-1519, k(cid:374)ew it was possi(cid:271)le, did(cid:374)"t k(cid:374)ow the (cid:373)e(cid:272)ha(cid:374)is(cid:373) (cid:271)ehi(cid:374)d it, by 1914, aircraft was used. *in 1 year, there are 24 million flights around world. Safest mode of transportation (done in 100 years). Magnitude is proportional to the area of leading edge of projectile. Higher pressure zone on leading side and a lower pressure zone on trailing side of projectile. Make the leading edge area (front area) as small as possible. Caused by a difference in pressure (front = high pressure zone. *reduce low pressure area by streaming it, lowering turbulence too. Profile drag increases from a to c (in the picture) as more area is exposed to oncoming airflow. Caused by water moving past surface of body. Bou(cid:374)da(cid:396)y laye(cid:396) of ai(cid:396) (cid:862)sti(cid:272)ks(cid:863) to p(cid:396)oje(cid:272)tile k(cid:374)ow(cid:374) as laminar flow.
