ORIGINAL: JohnnyS
Ernie,
Close, but not quite!
New clues:
1. Monoplane
2. Four engines
3. Heavily armed: 6 x 20mm cannon, 4 x heavy machine guns.
4. Single fin.
5. The engines were radials.
Ah.... you want me to go to the mountain (range). Okay, then; the Nakajima G8N Renzan. Thanks; Ernie P.
The Nakajima G8N Renzan (連山, "Mountain Range") was a four-engine long-range bomber designed for use by the Imperial Japanese Navy. The Navy designation was "Type 18 land-based attack aircraft" (一八試陸上攻撃機); the Allied code name was "Rita".
In February 1943 the Imperial Navy staff asked Nakajima Aircraft Company to design a four-engined bomber, capable of meeting an earlier specification set for a long-range land-based attack plane. The final specification, issued on 14 September 1943, called for a plane with a maximum speed of 320 knots (370 mph; 590 km/h) able to carry a 4,000 kg (8,800 lb) bomb-load 2,000 nmi (3,700 km; 2,300 mi) or a reduced bomb-load 4,000 nmi (7,400 km; 4,600 mi).
Nakajima's design featured a mid-mounted wing of small area and high aspect ratio, a tricycle landing gear and a large single-fin rudder. Power came from four 2,000 hp Nakajima NK9K-L "Homare" 24 radial engines with Hitachi 92 turbosuperchargers driving four-bladed propellers. The engines were cooled by counter-rotating fans positioned just inside the engine cowlings. Defensive armament included power-operated nose, dorsal, ventral and tail turrets along with two free-swiveling machine guns at the beam positions.
General characteristics
Crew: ten
Length: 22.94 m (75 ft 3 in)
Wingspan: 32.54 m (106 ft 9 in)
Height: 7.20 m (23 ft 7 in)
Wing area: 112 m² (1,205 ft²)
Empty weight: 17,400 kg (38,400 lb)
Loaded weight: 26,800 kg (59,100 lb)
Max. takeoff weight: 32,150 kg (70,900 lb)
Powerplant: 4 × Nakajima NK9K-L Homare 24 18-cylinder radial engines, 1,491 kW (2,000 hp) each
Performance
Maximum speed: 576 km/h (358 mph)
Range: 7,250 km (4,500 miles)
Service ceiling: 10,200 m (33,500 ft)
Rate of climb: 457 m/min (1,500 ft/min)
Wing loading: 239 kg/m² (49 lb/ft²)
Power/mass: 0.22 kW/kg (0.14 hp/lb)
Armament
2× 20 mm Type 99 cannon in each dorsal, ventral, and tail turrets
2× 13.2 mm (.51 in) Type 2 machine guns in nose turret
2× 13.2 mm (.51 in) Type 2 machine gun in fuselage sides
Up to 4,000 kg (8,818 lb) of bombs