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Before the outbreak of WWII, Germany was looking for new dive bombers and ground-attack aircraft designs. Two brothers, Ulrich and Wolfgang Hütter, who were glider designers, tried to meet the RLM's design specifications. Airframe strength was stressed, and the aircraft should have the flight performance of fighters of that time. Two proposals were submitted by the Hütter brothers.
The first design - Stubo 1 (short for Sturzbomber or dive-bomber) - was to be heavily armored. The wings were set low and were of an eliptical planform. A single 1200 horsepower Daimler-Benz DB 601 in-line engine provided the power The cockpit was set at the rear of the fuselage and the pilot only had small slits to see through. The single fin and rudder was blended into the rear fuselage/cockpit area. To help save weight and thus increase range, a conventional landing gear arrangement was dispensed with; instead, take off was accomplished with a trolly that could be jettisoned upon take off. Landing was to be on a belly skid after the propeller was blown off and lowered by parachute for recovery and later reuse. A single 500 kg (1102 lb) bomb could be carried externally beneath the fuselage in a fairing that could be dropped, and was also to be armed with several machine guns.
The second design - Stubo 2 (short for Sturzbomber or dive-bomber) - was also to be heavily armored and was similar to the Hütter Hü 136 (Stubo 1). The fuselage was lengthened on the Stubo 2 to accommodate the internal bomb bay which could hold a 1000 kg (2205 lb) bomb load. The same engine was used - a single 1200 horsepower Daimler-Benz DB 601 in-line engine - and take off and landing was similar to the Stubo 1.
These two projects envisioned by the Hütter Brothers did not quite reach the design specifications that the RLM set down. Along with potential problems arising from the landing procedure and the very limited vision from the cockpit, plus the fact that more conventional aircraft were being designed and built that could do the job as well if not better, these designs were not picked up for a development contract.