Calculating the Wind Speed Needed for a Weightless Building on Titan

[nickr917]

I think this is a pretty simple question but I can't seem to figure it out:

If there is a 90,000 kg building (20 m deep, 10 m long, and 10 m wide) on the surface of Saturns moon, Titan, how fast does wind have to blow over the top to have the structure become "weightless" (the air below the structre isn't movng).

(Titan Data: Atmospheric density: 5.38 kg/m3 Gravity: 1.37 N/kg)

Any help would be great

 

[FredGarvin]

I guess the easiest way to think of this one would be to use the basic lift equation. The tough part would be estimating the coefficient of lift for the building.

 

[nickr917]

Thats exactly what I thought but I have no idea how I would determine that. Anyone have any other ideas?