Design Innovation
The Sea Storm emerged from SG Aviation's ambitious goal to create an affordable amphibious aircraft for the growing kit-plane market. Designer Giovanni Salsedo and the SG Aviation engineering team developed the aircraft around a composite hull construction that provided both strength and water resistance while keeping weight to a minimum at 309 kilograms empty. The pusher-engine configuration, with the Lycoming O-235 mounted behind the cabin, protected the propeller from water spray during operations and provided excellent forward visibility for water landings.
The aircraft's distinctive design featured small airfoil sponsons for lateral stability on water, a highly swept vertical stabilizer, and retractable tricycle landing gear that allowed seamless transition between land and water operations. The 125-centimeter-wide cabin provided comfortable side-by-side seating under a hinged canopy, with an optional four-seat configuration available for builders seeking greater capacity.
Manufacturing and Production
SG Aviation srl, founded in 1981 by a consortium of French and Italian aeronautical engineers, initially focused on subcontract manufacturing work including Aermacchi MB-339 empennages for Italy's aerobatic demonstration team and Martin-Baker ejection seat components. The company's experience in composite construction and precision manufacturing positioned it well for the emerging kit aircraft market of the early 1990s.
By 1998, SG Aviation had sold 25 Sea Storm kits with 12 completed aircraft flying worldwide. The company estimated 700 hours for kit assembly, reduced to 550 hours for quick-build versions that included pre-fabricated major components. Kit builders received detailed construction manuals and technical support from the Italian factory, though the complexity of amphibian construction meant the Sea Storm attracted primarily experienced builders.
Performance Characteristics
Powered by the reliable Lycoming O-235 producing 86 kilowatts, the Sea Storm demonstrated respectable performance for its class. Land operations required just 122 meters for takeoff and 145 meters for landing, while water operations demanded 250 meters for takeoff and 189 meters for landing under standard conditions. The aircraft's 100-liter fuel capacity provided adequate range for coastal touring and training missions.
The pusher configuration, while protecting the propeller during water operations, required careful weight and balance considerations. Pilots appreciated the excellent visibility during water taxi operations and the positive control response during the critical transition from water displacement to planing speed.
Company Evolution
SG Aviation's involvement in advanced projects extended beyond kit manufacturing. The company participated in the European Consortium AESN's SEABUS project, researching wing-in-ground-effect vehicles and constructing prototype wings. This experience with unconventional aircraft configurations informed the Sea Storm's design, particularly its water handling characteristics.
The company later rebranded as Storm Aircraft to align with its successful Storm series landplanes, which achieved significantly higher production numbers with over 650 aircraft ordered by 2003. Under the Storm Aircraft name, the company expanded its offerings and continues operations today, claiming over 1,200 aircraft delivered across 20 countries over three decades.
Limited Legacy
Despite its technical sophistication, the Sea Storm remained a niche product within an already specialized market. The complexity and cost of amphibian construction limited appeal compared to the company's simpler landplane variants. By February 2014, only one Sea Storm maintained active registration with the FAA, though additional aircraft may have operated under experimental or foreign registrations.
The Sea Storm's significance lies not in production numbers but in demonstrating the feasibility of sophisticated amphibian designs for amateur construction. Its composite hull technology and integrated systems approach influenced subsequent kit amphibian designs, though few manufacturers attempted to match its level of refinement.
Technical Specifications
The Sea Storm's 9.24-meter wingspan and 12.25-square-meter wing area provided adequate lift for its 608-kilogram maximum gross weight. The aircraft accepted engines ranging from 75 to 194 kilowatts, though most builders selected the standard Lycoming O-235 for its proven reliability and reasonable fuel consumption.
The ICAO designation SSTM reflects the aircraft's specialized nature and limited production. While detailed performance data remains scarce due to the small number of completed aircraft, the Sea Storm represented a notable achievement in Italian kit aircraft design during the experimental aviation boom of the 1990s.