The history of Sportster aircraft begins in early 30-s when a 2-seat open-cockpit low-wing monoplane known as "sportsman" from Ryan Aeronautical Company the Ryan ST was manufactured and used as a trainer and sport aircraft in several countries. In late 80-s several amateur manufacturers and designers  succeeded with reminiscence of that classical model presenting  a design that is simple and inexpensive to build and maintain. Its advantages include good speed and economy per horsepower as well as docile handling in flight.

The Spacewalker II has a chromoly steel tube and fabric fuselage and tail, with a wooden cantilever wing and a conventional or taildragger landing gear. The tandem design can be flown with one or two occupants, as the front passenger seat is placed on the fore-and-aft center of gravity so that it can be flown empty without affecting the aircraft's balance. Kits and plans have been available from several successive companies since 1990. As is common in the kit building industry. Over 100 examples have been built and flown.

The Sportster is a new aircraft design with the same configuration, open cockpit 2 place tandem like the Revolution airplane. Currently there are  two versions of the Sportster, one with both seats open, one with the front seat open or covered and the rear a removable canopy.

The Sportsters have flown over 250 hours, and has completed several cross country trials, spin testing, mild aerobatic testing and is currently being flown several times a week, and used for demo rides! The Sportster is also undergoing a design stress analysis. Estimated stall speed at 45 MPH, and a 130MPH max cruise due to the more streamlined wind screens, and less wing area!

The Sportster was designed to offer the taller and wider pilots an alternative. It keeps the same look as all the Warner line of aircraft but the fuselage is stretched and widened to allow 6'5 tall pilots to fly in comfort. Of course being open cockpit, tall doesn't seem to be a problem from first glance (no top) but the cockpit of the prior airplanes was limited by leg room.

The Sportster flying quality report can be found in the in the August 2000 Sport Aviation magazine it was a big hit and are currently taking orders for the kit.

The Sportster was derived from his earlier design, the Warner Spacewalker II by designer Jesse Anglin of Henderson, North Carolina to comply with the US light-sport aircraft rules. It features a cantilever low-wing, a single-seat or a two-seats-in-tandem open cockpit which can be optionally enclosed under a bubble canopy, fixed conventional landing gear and a single engine in tractor configuration. The aircraft fuselage is made from welded steel tubing, with its wooden wings covered in doped aircraft fabric. Its 28.5 ft (8.7 m) span wing has an area of 112.1 sq ft (10.41 m2). The standard engine available is the 100 hp (75 kW) Continental O-200 four-stroke powerplant. The 125 to 140 hp (93 to 104 kW) Lycoming O-290 has also been used.