I was able to find a helicopter in 3D Warehouse that had various parts, including the blades, seperate. To import them as sub-props in iClone, in 3DXchange 4 Pro, select the propellor blades and click Make Sub-Prop (on the right). This will create a new sub-prop for these blades. Do the same for the tail blades.
The next thing to do is to adjust the pivot of the blade props, which determines the axis the blades will rotate around. In 3DX, select the propellor blades sub-prop and click Edit Pivot. This will show the current position of the pivot of the blades prop and a dialog box to change the position of the pivot.
Change the position of the pivot so that the vertical axis lines up with center of the blades. The other axes are less critical but it is best to line them up so that they are more or less in the same plane as the blades.
Do the same for the tail blades object, except that axis of rotation is horizontal.
Import the helicopter into iClone. There should now be two separate sub-props for the blades, which you should be able to animate.
If the Sketchup helicopter is a single object in 3DXchange, you should seperate the blades first in Sketchup as PW suggests, then proceed as explained above.
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