Development
The SM.89 was intended to be a bomber/attack aircraft, something similar to Junkers Ju 88. The aircraft displayed some impressive features, but it was not a new project, rather an extrapolation from the earlier SM.84. The project utilized the wings, the aft fuselage and the mixed construction of the latter almost untouched, with a totally redesigned nose. The fuselage was made from a skeleton of steel tubes, covered with duralumin and wood back as far as the dorsal turret, the remainder of the fuselage being of wood and fabric construction. The wing was made of wood using three spars and a covering of compensate wood. The control surfaces comprised slats and flaps, and the ailerons, that were lowered partially with the flaps to increase lift.
The forward fuselage was the real difference between the SM.84 and SM.89. The forward fuselage housed only one pilot, after him there was a radio operator/gunner, and finally a gunner. Therefore the aircraft had only half a crew, compared to the S.84. The fuselage was much more cramped than the S.84's, this was also due to the tandem position for all the crew, because less surface led less protection needed.
The aircraft did not have a nose engine, unlike many contemporary Italian designs. The SM.89 was a two-engine aircraft. In this manner, the nose could be used to house weapons. The nose section was rounded, short and much inclined, to assure the best visibility for attack. The weaponry was mainly based on the 37 mm (1.46 in) Breda anti-aircraft guns, used in the anti-tank and anti-ship role. Three 12.7 mm (.50 in) Breda machine guns were also fitted in the nose. A further Breda was also fitted in the dorsal turret, and another was in a new model turret, a remote-controlled one, in the ventral position.
The aircraft could carry 700 bomblets or 1,400 kg (3,090 lb) of bombs or torpedoes under the belly. The aircraft could also be fitted with air brakes for dive bombing. The aircraft's speed also made it possible to use the aircraft as a bomber interceptor, however it was never fitted with a radar.
The Piaggio P.XI engines were however too weak for the aircraft, so instead, they used two Piaggio P.XII RC.35s, which could develop 1,119 kW (1,500 hp) at take-off. These engines were in a more compact installation than those of the Piaggio P.108s and CANT Z.1018s. The aircraft could also carry 2,700 L (710 US gal) of fuel in self-sealing fuel tanks, which gave the aircraft an effective range of 720 km (450 mi).
This SM.89 had a very heavy protection. The armour for the front and windscreen totaled 300 kg (660 lb), another 300 kg (660 lb) of armour protected the engines, and a further 80 kg (180 lb) for the aft armour. The aircraft was also possibly equipped with a CO² fire extinguisher system.
Read more about this topic: Savoia-Marchetti SM.89
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