The S-12XL Airaile was originally intended to be cut from the line at the same time, but customer demand convinced the company to retain the model.

[6][9] The S-12 Airaile was designed by Randy Schlitter and introduced in March 1990 as a two-seat side-by-side, tricycle gear ultralight aircraft for recreational and flight training use.

The S-17 Stinger retains the wings, tail, boom tube of the S-14, mated to new forward 4130 steel tube cockpit and equipped with conventional landing gear to create an open-cockpit ultralight that complies with the US FAR 103 Ultralight Vehicles regulations.

All fuselage, wing and tail surfaces are covered in Dacron or, on some models, dope and fabric.

In 1998 Kitplanes magazine said that the S-14 has "squeaky clean handling feels like a little jet, but lands like an ultralight".