Udet U-11 Kondor
The U 11 (Werk.N. 243) was completed in December 1925, and was the largest aircraft produced by Udet Flugzeugbau, München-Ramersdorf, following an order by Deutscher Aero Loyd. It was an open-cockpit design with side-by-side seating for the two pilots. The navigator's station was located in the very front of the aircraft, ahead of the pilots. The fuselage was constructed from Duralumin profiles and covered by Duralumin sheets. It could seat eight passengers and also contained a toilet and a luggage compartment.
The wings, featuring two main spars, were manufactured from wood, with fabric covering and a plywood-reinforced leading edge. The empennage consisted of Duralumin tubing and profiles, also covered with fabric. The landing gear was fitted with a then rather common rubber suspension system and 1100 by 220mm main wheels.
January 1926 at Oberschleissheim airfield north of Munich, with test pilot Harry Rother
First flown by Harry Rother on January 19, 1926, the U 11 was powered by four Siemens & Halske Sh 12 air-cooled radial engines with aerodynamic fairings, extended driveshafts (necessitated due to the pusher configuration), and two-blade propellers. The U 11 Kondor had a dangerously close clearance between the pusher propellers and rear passenger door, which caused one fatality.
The sole Udet U 11 Kondor [Condor] Grossverkehrsflugzeug [large airliner], Werknummer 243, was devoid of any markings; it would later be assigned D-828.
Rother's test flights revealed significant design shortcomings. Tested by the DVL, the registration was approved on 8th of April 1926.
Bought by the Deutsche Aero-Lloyd AG and delivered to Deutsche Lufthansa (successor to Deutscher Aero Loyd) in 1926, but because of bad flying characteristics, DLH would not accept it. After negotiations the U.11 was sold to Deutsche Verkehrsfliegerschule [German air transport school] for 500 thousand RM.
The U 11 subsequently crashed during the delivery flight to Deutsche Verkehrsfliegerschule [German air transport school], for a total loss for DLH of 1 million RM.
The failure of the U 11 was among the reasons for the financial failure of Udet Flugzeugbau and its eventual acquisition by Bayerische Flugzeugwerke AG (BFW).
Engines: 4 × Siemens-Halske Sh 12, 75 kW (100 hp)
Length: 16 m (52 ft 6 in)
Upper wingspan: 22 m (72 ft 2 in)
Wing area: 70 m2 (750 sq ft)
Aspect ratio: 7
Height: 4 m (13 ft 1 in)
Empty weight: 3,370 kg (7,430 lb)
Gross weight: 4,572 kg (10,080 lb)
Fuel capacity: 300 kg
Maximum speed SL: 152 km/h (94 mph; 82 kn)
Cruising speed SL: 135 km/h (84 mph; 73 kn)
Service ceiling: 3,190 m (10,466 ft)
Climb rate: 1.5 m/sec
Time to 1000m: 11.33 min
Time to 2000m: 28.25 m
Time to 3000m: 68.79 min
Practical range: 500 km
Endurance 3.60 h