Code: Select all
<function name="aero/function/kCLge">
<description>Change_in_lift_due_to_ground_effect</description>
<table>
<independentVar>aero/h_b-mac-ft</independentVar>
<tableData>
0.0000 1.2030
0.1000 1.1270
0.1500 1.0900
0.2000 1.0730
0.3000 1.0460
0.4000 1.0280
0.5000 1.0190
0.6000 1.0130
0.7000 1.0080
0.8000 1.0060
0.9000 1.0030
1.0000 1.0020
1.1000 1.0000
</tableData>
</table>
</function>
So that's wingspan above ground level..
Here's something to think about, and we're only thinking about ground effect on LIFT.... but if you're flying at a positive AoA generating LIFT, ground effect has an effect... But if you're flying at a negative angle of AoA, sufficiently so as to not be generating lift but instead SINK (if that's the correct term) ground effect shouldn't have an effect.
Granted if you do do this within one wingspan of the ground, you're not going to notice this effect for very long.
Simon