Three rudders and a horizontal pitch-control assembly mounted on the duct provide the control. All controls, including throttles, are routed to the 3-axis control stick. Tri-Flyer can fly over land, water, ice and snow. She can land on ice that is too thin to walk on, and in water where she'll float, just like an ordinary boat. The cost of engines will depend on whether you purchase them new or used.
Plans give the source for purchasing the fans.
Required building skills are minimal. Tri-Flyer is built much like a wooden boat. Tri-Flyer was featured in Popular Mechanics magazine, May 1986. Click on the small images in the left margin to see larger images. Wood monocoque Con.