Whisper X350 Generation II
South African kit aircraft design
The Whisper X350 Generation II is a South African amateur-built aircraft, designed in 2015 and produced by Whisper Aircraft of Mossel Bay. The aircraft was developed from the 2004-designed Whisper Aircraft Whisper motorglider. The X350 Generation II is supplied as a kit for amateur construction.
The X350 Generation II designation indicates a design top speed goal of 350 km/h (189 kn), with the larger engine fitted.
Design and development
The aircraft features a cantilever low-wing, a two-seats-in-side-by-side configuration enclosed cockpit that is 47.2 in (119.9 cm) wide, under an acrylic plastic articulated lift-up bubble canopy. It has fixed optionally tricycle landing gear or conventional landing gear and a single engine in tractor configuration.
The aircraft is predominately made from vacuum-bagged, post-cured carbon fibre composites, with E-glass used for non-structural parts, including the engine cowling, aircraft fairings, wing and tail tips. The structure is 10% anodized aluminum and cadmium-plated steel, with the landing gear legs made from steel.
The design's 26.17 ft (8.0 m) span wing has an area of 122 sq ft (11.3 m2) and mounts plain flaps and features a cruciform tail. The aircraft's recommended engine power range is 160 to 200 hp (119 to 149 kW) and standard engines used include the 160 hp (119 kW) Lycoming O-320, the 180 hp (134 kW) Lycoming O-360, the 200 hp (149 kW) Lycoming IO-390, or the 180 to 200 hp (134 to 149 kW) ULPower UL520i four-stroke powerplants.
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