Designed by Alessandro Marchetti and flown for the first time on 31 January 1944 at Varese, the SM.93 was a fascinating aeroplane in several respects. Firstly, it was powered by a Daimler-Benz DB 605A 12-cylinder inverted-vee liquid-cooled engine rated at 1,475 hp at sea level and 1,250 hp at 5800 m which was installed beneath the pilot's cockpit; secondly, the pilot occupied a prone position with a gunner/observer occupying an orthodox aft-facing seat, and thirdly, it was entirely of wooden construction, which, unusual for combat aircraft at the time of the SM.93's debut, was unique among aircraft designed specifically for the dive bombing mission.
The SM.93 had a two-spar three-piece wooden wing with ply and fabric skinning and a wooden monocoque fuselage. Armament consisted of a 20-mm cannon with 150 rounds firing through the propeller hub, a 12,7-mm machine gun with 350 rounds in each wing and a similar weapon on a flexible mounting in the rear cockpit. A bomb load of 820 kg was intended to be carried on the fuselage centreline. The prototype had made 16 flights totalling 6 hrs 40 mm by 29 March 1944 -during these diving speeds of the order of 900 km/h had been achieved - but on that date the German Control Commission ordered the termination of flight testing.
|Engine||1 Daimler-Benz DB 605A|
|Armament||1 20 mm gun ( 150 rounds ) firing through the propeller hub, 2 12.7 mm machine guns ( 350 rpg ) in the wings, 1 12.7 mm machine gun on a flexible mounting in the rear cockpit. Bombload 820 kg|
|Dimensions||Length 10.93 m, span 13.90 m, height 3.80 m, wing area 31.10 m2|
|Weights||Empty 3552 kg, normal flying weight 5500 kg|
|Performance||Max. speed 515 km/h at 4500 m, 542 km/h at 7000 m ( with bombload), 580 km/h at 7000 m ( clean ), cruising speed 505 km/h at 7000 m, range with max. bombload 1650 km, climb 9.66 min to 6000 m, service ceiling 8200 m|
Source: Air International August 1982