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Monday, January 12th 2004, 9:41am

Australia times cost 1D 25/12/21

to day the navy department has announced two 22,000 repalcment cairres for HMAS Horbat each cairre are to be built in the comeing year and will have a wing of 70 aircaft on bored the minister for the mr John black could not be reacht for coment at this time the class cairrers will be named
HMAS Maxwell and Steelwell.

Maxwell class, Australian Cairrer laid down 1922

21,425 t light; 22,000 t standard; 24,351 t normal; 26,134 t full load
Loading submergence 1,047 tons/feet

700.00 ft x 100.00 ft x 32.00 ft (normal load)
213.36 m x 30.48 m x 9.75 m

15 - 4.50" / 114 mm guns
15 - 3.70" / 94 mm AA guns
Weight of broadside 1,063 lbs / 482 kg

Belt 1.00" / 25 mm, ends unarmoured
Belts cover 77 % of normal area
Main belt does not fully protect magazines and engineering spaces
Main gun shields 1.00" / 25 mm, AA gun shields 1.00" / 25 mm
Armour deck 3.00" / 76 mm

Oil fired boilers, steam turbines,
Direct drive, 4 shafts, 134,358 shp / 100,231 Kw = 31.96 kts
Range 10,000nm at 15.00 kts

974 - 1,267

£4.090 million / $16.359 million

Distribution of weights at normal displacement:
Armament: 133 tons, 0.5 %
Armour: 2,260 tons, 9.3 %
Belts: 179 tons, 0.7 %, Armament: 47 tons, 0.2 %, Armour Deck: 2,033 tons, 8.4 %
Conning Tower: 0 tons, 0.0 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 4,558 tons, 18.7 %
Hull, fittings & equipment: 7,474 tons, 30.7 %
Fuel, ammunition & stores: 2,926 tons, 12.0 %
Miscellaneous weights: 7,000 tons, 28.7 %

Metacentric height 5.6

Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.06
Shellfire needed to sink: 24,527 lbs / 11,125 Kg = 538.3 x 4.5 " / 114 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2.8
(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: 0.03
Relative quality as seaboat: 1.27

Hull form characteristics:
Block coefficient: 0.380
Sharpness coefficient: 0.33
Hull speed coefficient 'M': 7.39
'Natural speed' for length: 26.46 kts
Power going to wave formation at top speed: 53 %
Trim: 56
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 96.5 %
Relative accommodation and working space: 148.1 %
(Average = 100%)
Displacement factor: 125 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.96
(Structure weight / hull surface area: 129 lbs / square foot or 627 Kg / square metre)
Relative longitudinal hull strength: 1.46
(for 20.67 ft / 6.30 m average freeboard, freeboard adjustment 2.58 ft)
Relative composite hull strength: 1.01

This cairrer has room on borad for 70 aircraft 30 figther and 30 torpedo bombers with 10 reconses aircarft this two ships of this class are to replace HMAS Horbart


Monday, January 12th 2004, 5:02pm


Very suspicious looking ship if you ask me since you only need 4900 tons for the 70 planes (I assumed that the given number of 70 planes is the maximum it can carry despite the fact that it has enough space for 93 planes and enough miscellaneous load for 83 planes) leaving you with 2100 tons misc load. I tried to sim it but it is pretty hard to get the right data for it.
I have a weird idea what I would do with a ship like this so I like it a lot except for the rather low BC of 0.380 which seems a bit ridiculous for a ship that size so I think it is advisable to adjust that a bit. Armor is very low, but with that weird idea I have in my mind, I doubt a lot of armor is necessary (preferably no belt armor at all).



Monday, January 12th 2004, 5:28pm

By my reckoning 7,000t should be enough for an airgroup of 72 planes like with Francesco Morosini . This is by having (72*72) for flight deck and fuel +(72*250 for the weight of planes.

How much misc. weight byt your method Walter would you need for an airgroup of 48 and 64 aircraft?


Monday, January 12th 2004, 6:02pm

From the springstyle notes:


1) Take the square root of miscellaneous weight; e.g., if
miscellaneous weight is 10,000 tons, the weight-based limit
for your carrier is 100 aircraft. (In addition, allow at
least 25 tons per aircraft, i.e., if miscellaneous weight
is just 100 tons, your ship can carry 4 planes, not 10.)

The way I read that is that the minimum weight needed for 1 plane (and all the extras) has to be 25 tons, no less. When looking at the example in the springstyle notes, 10,000 tons will give you 100 aircraft meaning 100 tons per plane (and all the extras).

... meaning that you would need 2304 tons for 48 planes and 4096 tons for 64 planes. That is the way I read it and that is the way I always have applied it.

If misc weight is 100 tons it'll give you 4 planes (4 x 25). It does not say 116 tons ( = (4x25) + (4x4))

Am I right or am I reading it wrong?



Keeper of the Sacred Block Coefficient

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Tuesday, January 13th 2004, 10:13am

I agree with Walter...

For 70 planes you´ll need 4900ts. This includes all ammo, fuel, spareparts, tool shops etc. necessary to operate all those planes. You can, of course, add additional misc weight for staff facilities or extended (mission) range.


Tuesday, January 13th 2004, 2:56pm

I'll do it your way then, my carriers will become a lot more capable...