;S-12 Airaile :Original model. Production completed. ;S-12S Super Airaile :Similar to XL, but with dope and fabric covering. Production completed. ;S-14 Airaile :Single-seat version of the S-12, with Dacron covering introduced in 1991. Standard engine was the
Rotax 447 of , with the
Rotax 503 of and the
Rotax 582 of optional. Reported construction time 200 man-hours including complete cockpit fairing. Empty weight of places the S-14 above the maximum category weight of the US
FAR 103 Ultralight Vehicles category. Production completed with 125 completed by December 2004. ;S-17 Stinger :Open-cockpit, conventional landing gear, single-seater, equipped with a standard
Rotax 447 of with the
Rotax 503 of optional. Empty weight of places the S-17 within weight of the US
FAR 103 Ultralight Vehicles category. The aircraft uses the wings, tailboom and tail of the S-14, but is fitted with a new steel tube cockpit structure. While it retains the
flap-equipped wing of the S-14, the flaps are fixed. Production completed with 38 completed by December 2004. ;S-18 Stinger II :Open-cockpit, conventional landing gear, ultralight trainer with two seats in
tandem, standard engine is the
Rotax 503 of with the
Rotax 582 of , or the
Rotax 912UL of optional. The aircraft uses the wings, tailboom and tail of the S-12XL, but is fitted with a new steel tube cockpit structure. Production completed, with 30 completed by December 2004. ==Specifications (S-12XL)==