Ivy , laid down 1921, refitted 1933
Syringa , laid down 1921, refitted 1933, sunk 09-08-35 (bomb)
Hazel , laid down 1921, refitted 1934
Barberry , laid down 1921, refitted 1934, sunk 04-08-35 (mine)
Blackberry , laid down 1922, refitted 1934
Buddleia , laid down 1922, refitted 1935, sunk 16-09-35 (mine)
Ash , laid down 1922, refitted 1934
Buckthorn , laid down 1922, refitted 1939
Firethorn , laid down 1923, refitted 1939
Blackthorn , laid down 1923, refitted 1940
Cornel , laid down 1924, refitted 1940
Cranberry , laid down 1924, refitted 1940
Clematis , laid down 1926, refitted 1940
Juniper , laid down 1926, refitted 1940
Privet , laid down 1927, refitted 1940
Haw , laid down 1927, refitted 1941
Displacement:
523 t light; 544 t standard; 738 t normal; 889 t full load
Loading submergence 101 tons/feet
Dimensions:
195,21 ft x 24,61 ft x 8,53 ft (normal load)
59,50 m x 7,50 m x 2,60 m
Armament:
2 - 4,13" / 105 mm guns
4 - 1,57" / 40 mm AA guns
4 - 0,79" / 20 mm guns
Weight of broadside 79 lbs / 36 kg
Armour:
Main gun shields 1,38" / 35 mm, AA gun shields 0,98" / 25 mm
Machinery:
Coal and oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 2.002 ihp / 1.494 Kw = 16,50 kts
Range 6.000nm at 12,00 kts
Complement:
70 - 91
Cost:
£0,113 million / $0,451 million
Distribution of weights at normal displacement:
Armament: 10 tons, 1,3%
Armour: 4 tons, 0,6%
Belts: 0 tons, 0,0%, Armament: 4 tons, 0,6%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 126 tons, 17,1%
Hull, fittings & equipment: 302 tons, 41,0%
Fuel, ammunition & stores: 215 tons, 29,1%
Miscellaneous weights: 80 tons, 10,8%
Metacentric height 0,8
Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,18
Shellfire needed to sink: 1.199 lbs / 544 Kg = 34,0 x 4,1 " / 105 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0,7
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 71 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,18
Relative quality as seaboat: 1,61
Hull form characteristics:
Block coefficient: 0,630
Sharpness coefficient: 0,40
Hull speed coefficient 'M': 6,60
'Natural speed' for length: 13,97 kts
Power going to wave formation at top speed: 56 %
Trim: 44
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 78,4%
Relative accommodation and working space: 94,4%
(Average = 100%)
Displacement factor: 177%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1,27
(Structure weight / hull surface area: 51 lbs / square foot or 250 Kg / square metre)
Relative longitudinal hull strength: 3,00
(for 9,84 ft / 3,00 m average freeboard, freeboard adjustment 0,85 ft)
Relative composite hull strength: 1,38
After Refit 1933:
Displacement:
526 t light; 548 t standard; 738 t normal; 890 t full load
Dimensions: Length overall / water x beam x draught
196,85 ft / 195,21 ft x 24,61 ft x 8,53 ft (normal load)
60,00 m / 59,50 m x 7,50 m x 2,60 m
Armament:
1 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1921 Model
Breech loading gun in a deck mount with hoist
on centreline forward
6 - 1,57" / 40,0 mm guns (2 mounts), 1,95lbs / 0,88kg shells, 1921 Model
Breech loading guns in deck mounts
on side, evenly spread, 2 raised guns
4 - 0,79" / 20,0 mm guns (2x2 guns), 0,24lbs / 0,11kg shells, 1921 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 48 lbs / 22 kg
Shells per gun, main battery: 200
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,38" / 35 mm 0,98" / 25 mm -
3rd: 0,98" / 25 mm - -
4th: 0,59" / 15 mm - -
- Conning tower: 1,18" / 30 mm
Machinery:
Coal and oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 2.000 ihp / 1.492 Kw = 16,50 kts
Range 6.000nm at 12,00 kts
Bunker at max displacement = 342 tons (80% coal)
Complement:
69 - 91
Cost:
£0,105 million / $0,419 million
Distribution of weights at normal displacement:
Armament: 6 tons, 0,8%
Armour: 9 tons, 1,2%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 7 tons, 1,0%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 2 tons, 0,3%
Machinery: 126 tons, 17,1%
Hull, fittings & equipment: 305 tons, 41,4%
Fuel, ammunition & stores: 211 tons, 28,6%
Miscellaneous weights: 80 tons, 10,8%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1.248 lbs / 566 Kg = 35,3 x 4,1 " / 105 mm shells or 0,7 torpedoes
Stability (Unstable if below 1.00): 1,20
Metacentric height 0,9 ft / 0,3 m
Roll period: 11,1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,16
Seaboat quality (Average = 1.00): 1,75
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,630
Length to Beam Ratio: 7,93 : 1
'Natural speed' for length: 13,97 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 1,64 ft / 0,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 17,39 ft / 5,30 m
- Forecastle (20%): 14,76 ft / 4,50 m
- Mid (40%): 14,76 ft / 4,50 m (6,89 ft / 2,10 m aft of break)
- Quarterdeck (15%): 6,89 ft / 2,10 m
- Stern: 6,89 ft / 2,10 m
- Average freeboard: 10,25 ft / 3,12 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 74,7%
- Above water (accommodation/working, high = better): 92,9%
Waterplane Area: 3.613 Square feet or 336 Square metres
Displacement factor (Displacement / loading): 189%
Structure weight / hull surface area: 47 lbs/sq ft or 231 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,21
- Longitudinal: 4,13
- Overall: 1,37
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
After Refit 1939:
Displacement:
527 t light; 548 t standard; 738 t normal; 890 t full load
Dimensions: Length overall / water x beam x draught
196,85 ft / 195,21 ft x 24,61 ft x 8,53 ft (normal load)
60,00 m / 59,50 m x 7,50 m x 2,60 m
Armament:
1 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1921 Model
Breech loading gun in deck mount
on centreline forward
2 - 1,57" / 40,0 mm guns (1x2 guns), 1,95lbs / 0,89kg shells, 1935 Model
Anti-aircraft guns in deck mount
on side, all raised guns
2 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1933 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 40 lbs / 18 kg
Shells per gun, main battery: 250
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,38" / 35 mm 0,98" / 25 mm -
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -
- Conning tower: 1,18" / 30 mm
Machinery:
Coal and oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 2.000 ihp / 1.492 Kw = 16,50 kts
Range 6.000nm at 12,00 kts
Bunker at max displacement = 342 tons (80% coal)
Complement:
69 - 91
Cost:
£0,102 million / $0,410 million
Distribution of weights at normal displacement:
Armament: 5 tons, 0,7%
Armour: 6 tons, 0,8%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 4 tons, 0,5%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 2 tons, 0,3%
Machinery: 126 tons, 17,1%
Hull, fittings & equipment: 290 tons, 39,3%
Fuel, ammunition & stores: 211 tons, 28,6%
Miscellaneous weights: 100 tons, 13,6%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1.217 lbs / 552 Kg = 34,5 x 4,1 " / 105 mm shells or 0,7 torpedoes
Stability (Unstable if below 1.00): 1,20
Metacentric height 0,9 ft / 0,3 m
Roll period: 11,1 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0,09
Seaboat quality (Average = 1.00): 1,78
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,630
Length to Beam Ratio: 7,93 : 1
'Natural speed' for length: 13,97 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 1,64 ft / 0,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 17,39 ft / 5,30 m
- Forecastle (20%): 14,76 ft / 4,50 m
- Mid (40%): 14,76 ft / 4,50 m (6,89 ft / 2,10 m aft of break)
- Quarterdeck (15%): 6,89 ft / 2,10 m
- Stern: 6,89 ft / 2,10 m
- Average freeboard: 10,25 ft / 3,12 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 76,6%
- Above water (accommodation/working, high = better): 92,9%
Waterplane Area: 3.613 Square feet or 336 Square metres
Displacement factor (Displacement / loading): 185%
Structure weight / hull surface area: 45 lbs/sq ft or 219 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,21
- Longitudinal: 3,99
- Overall: 1,37
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather