Then there's Tygon tubing woven in-and-out of the fins, a bucket of water... with ice cubes? ... and an aquarium pump. (;-)) To be realistic ... a 12V computer fan from Radio Scrap with four sitck-on felt pads resting on top is really easy and inexpensive. 73! Ken Kopp - K0PP k0pp at arrl.net or k0pp at ixpres.com