Ar 234BThe RLM had already seen the promise of the design and in July had asked Arado to supply two prototypes of a Schnellbomber ("fast bomber") version as the Ar 234B. Since the original skid-equipped Ar 234A's fuselage design was very slender and entirely filled with fuel tanks, there was no room for an internal bomb bay and the bombload had to be carried on external racks.Since the cockpit was directly in front of the fuselage, the pilot had no direct view to the rear, so the guns were aimed through a periscope, derived from the type used on German World War II tanks, mounted on the cockpit roof. The defensive fixed rear gun system was generally considered useless and it was omitted in production examples of the Ar 234B, while still retaining the periscope for rearwards vision. The external bombload, and the aforementioned presence of inactive aircraft littering the landing field after their missions were completed (as with the similarly dolly/skid-geared Messerschmitt Me 163) made the skid-landing system impractical, so the B version was modified to have fully retractable tricycle landing gear, with the mid-fuselage very slightly widened to accommodate the forward-retracting main gear units, the nosegear retracting rearwards. The ninth prototype, marked with Stammkennzeichen (radio code letters) PH+SQ, was the prototype Ar 234B, and flew on 10 March 1944.
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