Atmospheric Case 03: Tumbling Brick, Dragless with Aerodynamic Damping

Atmospheric scenario 3 tests a dragless tumbling brick (CD = 0.0) falling from an altitude of 30,000 ft with an initial rotation rate of [9.995821927, 20, 30] deg/s while being affected by aerodynamic damping.


Constants and Models

This scenario uses a brick body model with fixed inertias and aerodynamic coefficients unless otherwise specified in the scenario. The original details of the model can be found here. The 1976 STD atmosphere model defines atmospheric properties at various altitudes, specified here. The brick's source of gravity is the J2 gravity model, specified here. The geodesy model used for this scenario is the WGS-84 rotating model, specified here.


Initial Conditions

Scenario Atmospheric Case 3: Dragless Brick with Aerodynamic Damping
Body Brick
Geodesy WGS-84 rotating
Atmosphere US 1976 STD; no wind
Orientation Body x-axis pointed north
Body y-axis pointed east
Body z-axis pointed down
Gravitation J2 Duration 30 s
Initial states
Aerodynamic Characteristics
 S (ft2)
b
c
CL
CD
CY
Cl
Cm
Cn
Clp
Clr
Cmq
Cnp
Cnr
 0.22222
0.33333
0.66667
0.0
0.0
0.0
0.0
0.0
0.0
-1.0
0.0
-1.0
0.0
-1.0
Geodetic Position
(deg, deg, ft MSL)		 Latitude
Longitude
Altitude, Mean Sea Level [1] 		0
0
30,000
Velocity (NED Frame)
(ft/s)		 X Velocity (North)
Y Velocity (East)
Z Velocity (Down) 		0
0
0
Body Attitude (NED Frame)
(deg)		 Roll
Pitch
Yaw 		0
0
0
Body Angular Rate (NED Frame) [2]
(deg/s)		 Roll Rate
Pitch Rate
Yaw Rate 		9.995821927
20
30

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Errata

Below is the list of erratum that are relevant to changes made on this page that no longer match the report. The full list can be found on the Home Page.

[1] Page 58, Table 27, incorrect initial altitude: Volume II Report ↩︎

[2] Page 56, the Rate section should specify body-axis quantities relative to the local frame: Volume II Report ↩︎