what you need to do is apply a transperancy to the plane that you have the propellor skin on.
http://www.fileplanet.com/dl.aspx?/p...torialsall.zip
the material application guide in that will tell you how to do it.
As for hiding bones, select the bones you want to hide, click on the little hammer thingie in renx, then click on w3d tools, and uncheck the box export geometry. This will make the bones invisible in-game, but they will still 'be' there.