At 611 gross tons, Royal Iris of the Mersey is the 71,640th largest of the 84,014 vessels in this registry that report a tonnage. The median across that set is 5,994 GT, so this hull is about 9.8 times smaller than the typical vessel on record here. The largest measures 499,167 GT.
Among the 1,234 ferrys held here, it ranks 720th by tonnage — larger than 18% of that group. Their median tonnage is 3,908 GT, and the largest tenth begin at 25,454 GT. The flag most often flown by this group is Japan (241 ships). The yard that appears most often against it is Mitsubishi Heavy Industries, with 34 hulls on record.
United Kingdom is the country of registry for 2,394 vessels in this directory, of which Royal Iris of the Mersey is the 1,453rd largest by tonnage. The most common class under that flag is vessels this registry holds no type classification for (1,835 ships), and the median vessel measures 2,515 GT. Browse every ship flagged United Kingdom.
Narrowing to both dimensions at once, this registry holds 40 ferrys flying the United Kingdom flag, of which 19 are larger by tonnage.
Royal Iris of the Mersey was built in 1960, making it 66 years old. It is one of 315 hulls in this registry delivered that year, a cohort whose median tonnage is 530 GT; within it this ship is the 69th largest. Across the whole of the 1960s the registry holds 4,074 vessels, median 844 GT. The median build year across the entire registry is 1995.
The registry attributes 3 vessels to Philip and Son, with a median tonnage of 614 GT, delivered between 1953 and 1960. See the rest of that yard’s output.
At 50.0 m overall, Royal Iris of the Mersey is 54.0 m shorter than the 104.0 m median for ferrys on record, with a beam of 12.0 m and a draft of 3.0 m.
IMO numbers are issued in broadly chronological blocks. Within 500 either side of 8633712 this registry holds 23 other vessels, whose median build year is 1964 and which range from 1874 to 2002. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1960.
Its IMO number, 8633712, carries its own check digit. The first six digits are weighted seven down to two and summed — 8×7 + 6×6 + 3×5 + 3×4 + 7×3 + 1×2 = 142 — and the last digit of that total, 2, must equal the seventh digit, 2. It does, so this number is well formed.
