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Thursday, October 21, 2004

The modified "Super-fast" battlecruiser design (circa 1920)

ook the basic design for the really fast battlecruiser and modified them to try and get the Spring Style program to "work". I've used a variant of those specs to see what my program would produce with them:

  • year: 1920
  • length: 804.0 ft
  • beam: 87.0 ft
  • depth: 55.5 ft
  • displacement: 34,312.0 tons
  • cp: 0.60
  • cm: 0.97
  • machineryWtBasis: 28.6 SHP/ton of machinery
  • hullWtBasis: 3.0x10^-3
  • freeboardForward: 35.0 ft
  • freeboardAmid: 26.0 ft
  • freeboardAft: 26.0 ft
  • forecastleLength: 270.0 ft
  • designedShp: 275,000.0
  • designedSpeed: 35.0
  • boardMargin: 100.0 tons
  • electricalPowerKW: 800.0KW
  • mainBattType: 17in/45
  • mainBattNum: 4.0
  • mainBattMount: turret
  • mainBattNumMounts: 2.0
  • secBattType: 4in/50
  • secBattNum: 16.0
  • secBattMount: shield
  • secBattNumMounts: 6.0
  • forecastleDeck: 0.0 in
  • upperDeck: 2.0 in
  • lowerDeckSlopes:0.0 in
  • lowerDeckFlat:0.0 in
  • mainBattBarbette: 9.0 in
  • mainBattTurret: 11.0 in
  • upperDeckSide: 0.0 in
  • upperBelt: 6.0 in
  • lowerBelt: 6.0 in
  • beltLength: 430.0 ft
  • beltForward: 0.0 in
  • beltAft: 0.0 in
  • deckForward: 0.0 in
  • deckAft: 3.0 in
  • antiTorpBh: 1.5 in
  • secBattArmor: 1.0 in
  • uptakeArmor: 1.5 in

This is part of the result from my program:

Designed draft=29.4996 ft

Hull Weight=11646.3 tons
Secondary Battery Weight=80.96
Armament Weight= 2474.16
Total Armor Weight=4199.17
Machinery Weight=9615.38
General Equipment Weight=1029.36
Normal Fuel Weight=1029.36
Maximum Fuel added Weight=2573.4
Reserve Feedwater Weight=2004.75

Legend Displacement=31230.0

Legend Draft=26.8499

Submergence of 1390.61 of actual displacement per foot

At Displacement=31230.0
Length=804.0
Beam=87.0
Draft=26.8499
Cp=0.6
Cm=0.97
Cb=0.582
DLR=60.0903
Wetted Surface=80174.1
B/H=3.24024

At speed of 35 knots power  is 225983.0 SHP
At speed of 36 knots power  is 260739.0 SHP
At speed of 37 knots power  is 303780.0 SHP
actual speed for 275000.0 SHP is 36.3313 knots

Deep Load Displacement=35808.2
Deep Load Draft=30.1823
Submergence of 1409.25 of actual displacement per foot

At speed of 34 knots power  is 232583.0 SHP
At speed of 35 knots power  is 261412.0 SHP
At speed of 36 knots power  is 305432.0 SHP
actual speed for 275000.0 SHP  is 35.3087 knots

Metacentric height at legend displacement (GM)=4.73343 ft

Metacentric height at deep load displacement (GM)=6.97987 ft

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