I am going to try and do a diorama with a Black hawk Chopper but I want to give the effect that the blades are still moving, Is there anyone out there that can give me some ideas on how to accomplish this.

Thanks

Clear plastic......... the dia of the blades....... I'm not quite sure how to paint this though..........

Similar to the above technique but depending on scale I would use clear plastic on an "pie slice" (if that makes sense) and then airbrush the yellow (if need) on the tip end of the plastic, and then airbrush up to half of the clear plastic with matt varnish starting from the leading edge.

hope this helps

Cut a sheet of clear plastic to a circle of the right size, and drill a hole in the center. Then mask an "X" on the plastic, leaving two slender triangles opposite each other with the points touching the center. Airbrush your blade color on to the plastic, in this case black, I think. Before the paint dries, take a cotton swab and stiff wood brush, dip it in thinner or water depending on the medium you're using, and scrub the painted area with an arcing motion. With this you're trying to achieve the blurry effect. After this is dry, just remove the mask and fix it to the model with some white glue.

HTH

How thick should the plastic be. And I guess the same thing would go for the tail rotor as well.

I don't have much experience with plastic sheet, but I would assume that you should use the thinnest stuff you can get so it doesn't break your suport. BTW, this technique is not original. I got it from bonus instruction sheet on making dios that came with Revell's Wright Flyer.

The same thing should work on the tail rotors.