Another unique aspect of the P.1101/92 design was its proposed armament of a single large-caliber 75mm BK 7.5-cm cannon fitted under the nose, offset to the starboard side. The cannon was intended to tackle directly with American and British bombers by providing P.1101/92 pilots with the firepower necessary in bringing down Allied warplanes with a short burst. While impressive in scope, the fitting of such large armament brought about its own design hurdles in terms of the needed internal space in the airframe for the weapon system, its feed mechanism and the ammunition supply. Also of note would have been the recoil effects of the weapons use while in flight and the terrible stress it may have placed on the metal airframe at speed. Such complicated weapon systems were also prone to jamming at the worst possible times and exposure to the frigid temperatures of the upper atmosphere would have compounded issues. Not out of the scope of the P.1101/92 would have been the addition of lower-caliber (perhaps 20mm) systems fitted to the wingroots - some artist impressions showcase this armament to enhance the killing power of the P.1101/92. Of course one could also not rule out use of high-explosive, unguided rockets or even wire-guided missile systems then under development by the Germans.
Power for the P.1101/92 airframe would have been provided by a pair of Heinkel-Hirth He S 0 11 series turbojet engines, each rated to develop up to 2,860lbs of thrust. Estimations abound as to performance specifications of the Messerschmitt design and include a 558 maximum top speed. The powerplant would have been another sticking point in further development of the P.1101/92 for turbojets, up to this point, were relatively temperamental and extremely thirsty installations. It would also be some time before it was realized to place such engines closer to the fuselage and do away with the underwing installations in whole. The technical aspects of the P.1101/92, coupled with the basic design aspects, would have been truly a mountain of sorts to overcome.
In the end, all additional development of the P.1101/92 was cancelled for priority was now being set on jet-powered implements that could operate from only a single engine instead of a proposed pairing. Additionally, jet engine production facilities were constantly disrupted by the Allied air campaign and the ever-encroaching Allied ground forces before the end of the war in May of 1945. The Allied bombing campaign ensured that logistical infrastructure for the German air force and armies was completely disrupted, leading to such cases where the jet powerplants were not available for delivery in the numbers required to bring designs such as the P.1101/92 to fruition. Such ended the tenure of this potentially amazing "bomber-killer" design.
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