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Acquired from the Royal Navy in 1943, Viscount Byng has been rebuilt into an arctic defense and support vessel for operations in the Canadian Arctic and the Northwest Passage.

HMCS Viscount Byng, Canadian (Ex-British, Ex-Nord) Monitor laid down 1913 (Engine 1943)



Displacement:
5,000 t light; 5,430 t standard; 5,960 t normal; 6,384 t full load

Dimensions: Length overall / water x beam x draught
339.00 ft / 339.00 ft x 55.00 ft (Bulges 75.00 ft) x 16.00 ft (normal load)
103.33 m / 103.33 m x 16.76 m (Bulges 22.86 m) x 4.88 m

Armament:
2 - 9.20" / 234 mm guns in single mounts, 510.00lbs / 231.33kg shells, 1943 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
8 - 5.50" / 140 mm guns (4x2 guns), 83.19lbs / 37.73kg shells, 1943 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, 1 raised mount - superfiring
4 - 2.24" / 57.0 mm guns (2x2 guns), 5.65lbs / 2.56kg shells, 1943 Model
Automatic rapid fire guns in deck mounts with hoists
on side, evenly spread
8 - 1.57" / 40.0 mm guns (2x4 guns), 1.95lbs / 0.88kg shells, 1943 Model
Dual purpose guns in deck mounts
on side, evenly spread
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1943 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 1,726 lbs / 783 kg
Shells per gun, main battery: 300

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 7.00" / 178 mm 200.00 ft / 60.96 m 9.00 ft / 2.74 m
Ends: 4.00" / 102 mm 109.00 ft / 33.22 m 9.00 ft / 2.74 m
30.00 ft / 9.14 m Unarmoured ends
Upper: 4.00" / 102 mm 200.00 ft / 60.96 m 7.00 ft / 2.13 m
Main Belt covers 91 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.00" / 203 mm 4.00" / 102 mm 6.00" / 152 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm -

- Armour deck: 2.00" / 51 mm, Conning tower: 8.00" / 203 mm

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 13,166 ihp / 9,822 Kw = 20.00 kts
Range 12,400nm at 10.00 kts
Bunker at max displacement = 954 tons

Complement:
338 - 440

Cost:
£0.471 million / $1.885 million

Distribution of weights at normal displacement:
Armament: 186 tons, 3.1 %
Armour: 1,697 tons, 28.5 %
- Belts: 958 tons, 16.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 217 tons, 3.6 %
- Armour Deck: 465 tons, 7.8 %
- Conning Tower: 57 tons, 1.0 %
Machinery: 719 tons, 12.1 %
Hull, fittings & equipment: 2,097 tons, 35.2 %
Fuel, ammunition & stores: 961 tons, 16.1 %
Miscellaneous weights: 300 tons, 5.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
8,917 lbs / 4,045 Kg = 22.9 x 9.2 " / 234 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.37
Metacentric height 3.6 ft / 1.1 m
Roll period: 16.7 seconds
Steadiness - As gun platform (Average = 50 %): 55 %
- Recoil effect (Restricted arc if above 1.00): 0.16
Seaboat quality (Average = 1.00): 1.10

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.513
Length to Beam Ratio: 4.52 : 1
'Natural speed' for length: 18.41 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.00 ft / 4.88 m
- Forecastle (25 %): 15.00 ft / 4.57 m
- Mid (70 %): 14.00 ft / 4.27 m
- Quarterdeck (15 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 14.58 ft / 4.44 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 72.8 %
- Above water (accommodation/working, high = better): 101.8 %
Waterplane Area: 12,569 Square feet or 1,168 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 105 lbs/sq ft or 513 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.07
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate

Re-engined for 20 knot speed
Bow lengthened and ice-strengthened
Rebulged for seakeeping
9.2" guns replaced with modern manufacture guns.
6" single turrets pulled and plated over. Twin 5.5" mounts installed on plates.