XFSUgimpLB41X From United States of America, joined Aug 2000, 4200 posts, RR: 37
Reply 1, posted (12 years 10 months 3 weeks 4 days 11 hours ago) and read 772 times:
There is 3 types of drag... and to quote my Gleim Flight/Ground Instructor Written exam study guide book (ah the big red book.. gotta love Gleim):
Induced drag: the portion of drag created by the production of lift. Induced drag varies inversely as the square of the airspeed. It increases total drag as airspeed is reduced below the maximum lift/drag ratio speed.
Profile drag: the resistance, or skin friction, due to the viscosity of the air as it passes along the surface of the wing.
Parasite drag: increases with airspeed and increases total drag above the maximum lift/drag ratio speed.
EssentialPowr From United States of America, joined Sep 2000, 1820 posts, RR: 2
Reply 3, posted (12 years 10 months 3 weeks 3 days 10 hours ago) and read 755 times:
Ahhh...it seems the Gleim didn't cover it all (is that possible?) Maybe there is more to the topic than that required to meet CFI/AGI requirements...
The "Area Rule" typically relates to Form drag, also know as Boundry Layer Normal Pressure drag. Profile drag is a combination of Form drag and Surface Friction drag. So, the "area rule" is a component of Profile drag.
Wave drag is drag solely associated with shock wave formation, and is a different animal than Parasitic drag.