Kawanishi H6K Mavis
Owing much to American and French flying-boat design of the mid-1930s, the large four engine Kawanishi Type 97 parasol monoplane flying boat. When first flown in July 1936, The Type 97 was Japan's only in-service long-range reconnaissance flying-boat when that nation went to war in December 1941. The H6K1 initial military version entered limited service with the Imperial Japanese Navy in 1938, and was followed by 10 H6K2 flying-boats.
The first major production version, the H6K4, was powered by four Mitsubishsi Kinsei 43 radiais and armed with four 7.7mm machine-guns in bow and midships positions and a 20mm cannon in a tail turret, and was capable of carrying two 800kg bombs or torpedoes. A total of 66 were in service at the time of Pearl Harbor, later aircraft powered by Kinsei 46 engines. These boats were widely employed, although the initial heavy defeats inflicted on the Allies in the Pacific rendered maritime reconnaissance duties subordinate to the need for air transportation of Japanese troops during the swift conquests in the East Indies and elsewhere. A number of aircraft, designated H6K4-L, were converted for transport duties and were each able to accommodate about 18 fully-armed troops. Lacking armour and self-sealing fuel tanks, they were extremely vulnerable to fighter attacks and, after a number had been shot down, a new version entered production as the H6K5 in August 1942. By that time the maritime reconnaissance version had been given the reporting codename 'Mavis' by the Allies, the transport derivative being named 'Tillie'. Powered by either Kinsei 51 or 53 radials, the H6K5 was intended to eliminate the shortcomings of the earlier versions, but although the open bow gun position was replaced by a single-gun turret immediately aft of the pilot's cockpit, the overall armament was not increased. Only 36 H6K5s were completed by 1943, when production gave place to the greatly superior H8K.
H6Ks served with the 8th, 14th, 801st, Toko and Yokohama Kokutais, and some of the H6K5s were employed as naval staff transports throughout the Pacific in 1943. Eighteen aircraft served on the quasicommercial courier services in South East Asia, a number of them being destroyed by Allied aircraft both in the air and at their moorings.
Engine: 4 x Mitsubishi "Kinsei-51", 975kW
Take-off weight: 17500-23000 kg / 38581 - 50707 lb
Empty weight: 12380 kg / 27293 lb
Wingspan: 40 m / 131 ft 3 in
Length: 25.63 m / 84 ft 1 in
Height: 6.27 m / 20 ft 7 in
Wing area: 170 sq.m / 1829.86 sq ft
Max. Speed: 380 km/h / 236 mph
Cruise speed: 255 km/h / 158 mph
Ceiling: 9560 m / 31350 ft
Range: 4870 km / 3026 miles
Range w/max.fuel: 6670 km / 4145 miles
Armament: 1 x 20mm cannon, 4 x 7.7mm machine-guns, 2 x 800-kg torpedos or 1000kg of bombs