Of the large and long-ranged flying boats one of the best was the Kawanishi H8K2, also known by the Allied codename of Emily.
Two flying boats in WW II were known for their defensive firepower — the Short Brothers Sunderland and the Kawanishi Emily. The Emily, though, had no peers in this category with her 5 x 20mm cannon supplemented by 5 x 0.303 caliber machine guns.
Unusually for Japanese aircraft in WW II this aircraft had protected fuel tanks. The four powerful 1,850 hp engines made for record speeds for this category of aircraft, 269 mph (433km/h) with a range of 3,000 miles (4800 km).