the engine was a v-12 671 kw (900 hp) isotta fraschini l.121 r.c.40 driving a three-bladed alfa romeo electric propeller. top speed was around 465 km/h (289 mph) at 5,350 m (17,550 ft) with a 10,000 m (32,810 ft) ceiling. the range was relatively small, around 672 km (418 mi). dimensions were 8.1 m (26.6 ft) length, 9.3 m (30.5 ft) height, 2.8 m (9.2 ft) wingspan, 21.4 m (230.3 ft) wing surface. the weight was 1,855/2,435 kg (4,090/5,368 lb), with 570 kg ( lb) of payload.