Northrop B-35 nd two R-4360-21 Wasp Major air-cooled radials rated at 3000 hp each. Performance: Maximum speed 391 mph at 35,000 feet, cruising speed 183 mph. Service ceiling 39,700 feet. An altitude of 35,600 feet could be attained in 57 minutes. Range was 8150 miles in Public bookmarkswith avianorthropwarwarbirds