The Rohrbach Ro VII Robbe (English: Seal) was an all-metal, twin engine flying boat built in Germany in the 1920s.
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.
If, in an emergency the Robbe alighted without power, these could each be extended and a simple, triangular sail raised to reach safety.
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.
[1] To keep them clear of the spray of take-off, each of the Robbe's two 170 kW (230 hp) 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.
[2][4] In August 1926 the Robbe set at least four world speed records for aircraft carrying loads of 500 and 1,000 kg (1,100 and 2,200 lb) over distances of 100 and 500 km (62 and 311 mi);[5] two of these remained unbroken well into 1927.
[8] Pilot and mechanic had a low glazed enclosed cockpit ahead of the wing leading edge.
[9] It flew for the first time in the last quarter of 1927 in passenger configuration, with four porthole style windows in the cabin walls.