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skyking · 05-01-2016, 12:50 PM

Here is the short answer.
During the ground roll, Tire friction is a significant portion of the total force to overcome in the first portion. Then as speed increases parasite drag, and parasite drag only that is added.
There is no induced drag until the aircraft has an angle of attack. It all comes back to that.
On the ground most planes have a negative angle of attack until it is pitched up and nosewheel lifted. This is called rotation.
At that moment you start to generate lift. The wings bend as they are loaded.

05-01-2016, 12:50 PM	#4 (permalink)
skyking Master EcoModder Join Date: Apr 2011 Location: Tacoma WA Posts: 1,399 Woody - '96 Dodge Ram 2500 SLT Team Cummins 90 day: 23.82 mpg (US) Avion and Woody - '96 Dodge/Avion Ram 2500/5th wheel combo 90 day: 15.1 mpg (US) TD eye eye eye - '03 Volkswagen Beetle GLS 90 day: 49.05 mpg (US) Mule - '07 Dodge Ram 3500 ST Thanks: 743 Thanked 528 Times in 344 Posts	Here is the short answer. During the ground roll, Tire friction is a significant portion of the total force to overcome in the first portion. Then as speed increases parasite drag, and parasite drag only that is added. There is no induced drag until the aircraft has an angle of attack. It all comes back to that. On the ground most planes have a negative angle of attack until it is pitched up and nosewheel lifted. This is called rotation. At that moment you start to generate lift. The wings bend as they are loaded. __________________ 2007 Dodge Ram 3500 SRW 4x4 with 6MT 2003 TDI Beetle 2002 TDI Beetle currently parked - 1996 Dodge 2500 Cummins Turbodiesel Custom cab, auto, 3.55 gears Last edited by skyking; 05-01-2016 at 03:42 PM..