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The Rohrbach Ro VII Robbe ((英語:Seal)) was an all-metal, twin engine flying boat built in Germany in the 1920s. It could be adapted to commercial or military rôles. ==Design and development== As the full company name (Rohrbach Metall-Flugzeugbau) makes clear, all Rohrbach aircraft were all-metal, including their duralumin skinning. The Robbe was a monoplane with a high wing described at the time as a semi-cantilever structure, meaning that there were no rigid wing struts but that it retained external bracing with flying wires to the wings from the lower fuselage. The wings were mounted with 5° of dihedral. In plan they were straight tapered, with unswept leading edges and blunt tips. Internally the wings were built around single box spars, assisted by leading edge and trailing edge boxes. The edge boxes also served as fuel tanks. At this time there were still doubts about the repairability of metal aircraft, so the Robbe's two-part wing was designed to be easy to inspect internally by the removal of the edge boxes and all parts were replaceable. The wing skin was riveted to the ribs.〔 The hull was flat-sided and deep. Its underside had two steps; in front of the first the hull bottom was a hollow V in section and behind it a flat V. There was a little water rudder behind the rear step. Pilot and mechanic sat side-by-side in an open cockpit, with gunner's positions ahead of them and at the trailing edge. Alternatively, the Robbe could be configured to carry four passengers, one in a forward cabin, two in a central one and one more im a rear cabin, or to carry goods or post. The hull was divided into seven watertight compartments to preserve buoyancy.〔 An unusual feature of each gunner's cockpit was a duralumin, telescopic mast. If, in an emergency the Robbe alighted without power, these could each be extended and a simple, triangular sail raised to reach safety.〔 At the rear the tail was conventional, with a blunted rectangular fin and small unbalanced rudder. The high aspect ratio horizontal tail, again rectangular apart from blunted tips, was mounted well up the fin and strut-braced to the upper fuselage. Like the rudder, the elevators were unbalanced.〔 To keep them clear of the spray of take-off, each of the Robbe's two BMW IV water-cooled six cylinder upright inline engines was mounted in pusher configuration high above the wings on vertical faired steel tube N-form struts, the forward inner one particularly sturdy, and with transverse V-strut bracing with its apex on the central, upper fuselage. The engines were cooled with radiators in the front of the engine cowling and behind shutters controlled from the cockpit. There was a reserve fuel tank above each engine.〔 The Robbe had upward tilted, stabilizing, chined floats at about one third span, each mounted on N-form struts and transversely braced with converging struts to the wing below the engine mountings. Each float was divided into three watertight compartments.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rohrbach Ro VII Robbe」の詳細全文を読む スポンサード リンク
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