Piaggio P.133 was a new strategic bomber and the construction of the 1st prototype was 90% finished on 8 Sept. 1943 (the armistice).
engines: 4 x 1,700 hp
max speed: 490 km/h
authonomy: 5,100 km
bombload: 4,800 kg
armament: 4 x 12,7 and 6 x 20 mm (2 dorsal turrets, 2 lateral, 1 tail, 1 ventral and 4 anterior)
According to "Dimensione Cielo" edizioni bizzarri, 1975 Piaggio P 133 had "tre armi fisse da 12.7 nel muso"=three 12.7 mm fixed machine guns in the nose controlled and aimed by the pilots like the fixed wing machine gun of Cant Z-1018.
It is possible that one further SAFAT were in the nose in a trainable system for one nose gunner/bomber. The alternative hypothesis could be 4 machine guns in one trainable turret style Lancaster tail turret but I have never heard anything about such a device in an Italian aircraft.
It is improbable that two or more gunners were planned in the nose of the bomber.
Port and starboard fuselage: two 20 mm Ikaria Mg-FF guns ( according the same source above) .
Tail: one Mg-151. Fuselage inferior step: one Mg-151.
The wing turrets of P-108 were withdrawn for two conventional and cheaper fuselage turrets.
The bomber is described as "completely metallic" with a heavy armor for the cockpit.
"Autonomia" and "Range" are not always synonimous, if we just take into consideration the parameter of fuel consumption the effective range for a mission of a fighter or a bomber to the target and ( hopely) back home is a little more than one half of its autonomy, for the lower fuel consumption of the lighter aircraft while it is flying back.In a cargo aircraft or in any aircraft in a transfer mission "range" can be the same thing.
A "range" of 2600 Km with 1500-2000 kg and much lower for the maximum bomb load ( six 800 kg explosive weapons which were ready in the arsenals in 1936 but were unrealiable for troubles of the pistol triggers) are more realistic data for the too late planned P133.
Here is something more exotic, still from Aerofan: 4 Piaggio P XXII 1700 HP radial engines, one more DB-605 in the fuselage connected with two centrifugal compressors , one which boosted the 4 Piaggio, one for the pressurization of the cockpit.
Bomb load: 10 500 Kg italian conventional bombs.
Armed with 5-6 Mg-151 or 12.7 mm SAFAT in trainable remote-controlled Breda turrets.

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