The Sassy is marketed by Protech Aircraft Inc in Houston, Texas, and is a simple-to-build two-seat side-by-side amateur built aircraft with STOL performance. The wings have pre-formed aluminium alloy ribs, spars and skins; the wingtips are fibreglass, as are the wing fillets, rear cabin fairing, and engine cowling. The flaperons are steel tube with aluminium covering. The fuselage is welded steel tube, as are the tail surfaces, covered in Ceconite. A non-retractable tailwheel landing gear is fitted, and G limits are +6/-4. Fuel capacity is 53 litres (11.65 Imp gals), and the type is available in kit form. The wings can be folded for ease of storage. The type can be completed as an ultra-light, or homebuilt, and at one stage was to be produced, along with the Carlson Sparrow, at a facility at Rutherford, NSW by Lake Macquarie Aviation. First of the type in this region was ZK-PTS (c/n AACA/1089), first registered in Hastings, NZ in August 1990. It was followed by ZK-PTT (c/n AACA/433), -PTU (c/n AACA/431), VH-LMZ (c/n N-165), -OSP (c/n N-159), and –PTF (c/n initially V124, later 1152). Examples registered under RAA regulations have included 28-0492 (c/n V129), 19-3067, 19-3418 and 19-3145 which is registered as a Lake Macquarie Aviation PT-2.
