Force Vector

ahmedtariq90 · December 20, 2017, 11:06

Can any one please help me about the Force Vector we select in calculation of Cd and Cl.

vitome · December 20, 2017, 16:41

I don't know if you're asking the the axis you need to select, but if it is... You've to select -y for the Cd and +x for the Lift. Sorry if you're asking something different but I didn't understand clearly

flotus1 · December 20, 2017, 16:52

I agree with -y being the only sensible option for drag. Lift depends on what the "up" direction actually is in this setup. Impossible to judge from the picture and description.

ahmedtariq90 · December 20, 2017, 23:37

I want actually to know what Force vector i should mention in calculation of Drag. In some tutorials the guy put X1 Y1 and Z1, in my case i agree with -y, but what does this mean by putting X1 and Z1. ? Help plz

flotus1 · December 21, 2017, 04:20

What are the x, y and z components of a unit vector in -y direction in a Cartesian coordinate system? Think about it, that will answer your question.

December 20, 2017, 16:41		#2
vitome New Member vito Join Date: Dec 2017 Posts: 5 Rep Power: 8	I don't know if you're asking the the axis you need to select, but if it is... You've to select -y for the Cd and +x for the Lift. Sorry if you're asking something different but I didn't understand clearly ahmedtariq90 likes this.

December 20, 2017, 16:52		#3
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	I agree with -y being the only sensible option for drag. Lift depends on what the "up" direction actually is in this setup. Impossible to judge from the picture and description. ahmedtariq90 likes this.

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December 20, 2017, 23:37		#4
ahmedtariq90 New Member Ahmed Join Date: Dec 2016 Posts: 10 Rep Power: 9	I want actually to know what Force vector i should mention in calculation of Drag. In some tutorials the guy put X1 Y1 and Z1, in my case i agree with -y, but what does this mean by putting X1 and Z1. ? Help plz

December 21, 2017, 04:20		#5
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	What are the x, y and z components of a unit vector in -y direction in a Cartesian coordinate system? Think about it, that will answer your question.