Ohio Class, Ballistic Missile Nuclear Powered Submarine, USS Kentucky SSBN737




Model specifications:

The original idea was to build a 1:96 scale kit hull, but as things turned out, it went of the marked. I then bought the blueprints in 1:96 scale, scanned them into the computer, and enlarged it to 1:81. More about the scratch considerations can be read in the
chapter "
Initial considerations of scratch building" 

The table below shows the hard facts about my submarine, build from a paper sketch to a complete, fully operational model.


Planning begun: November 2002
Laid down: January 2003
Launch: Estimate pending re-build of internal parts.
   
Scale: 1:81
Length: 82,9" ( 210,7 cm.)
Beam: 8,27" ( 21 cm.)
Weight, air filled ballast tank: Estimate pending re-build of internal parts.
Weight, flooded ballast tank: Estimate pending re-build of internal parts.
Minimum / normal draft: ?? ď ( ?? cm.) / 5,1" ( 13 cm.)
Normal max. dive dept: (Note 1) 9.8 ft. ( 3 m.) (Can be increased to max. 82 ft. ( 25m.) by adjusting the onboard regulated air pressure, and by increasing radio range.)
Tested crush depth: 82 ft. ( 25 m.) (Tested to 2.5 bar / 2.467 atm.)
(In scale, that's equal to 6642 ft. / 2.025 m.)
Number of parts: (Note 2) Estimate pending re-build of internal parts.
   
Propulsion: 1 electrical engine and 1 seven bladed propeller.
1 high performance bow thruster
Dive system: Static and dynamic. Pressurized water & air / CO2
   
Battery type ; specs: NiMH ; 1,2 V / 4Ĺ Ah pr. cell 
Battery configuration: 10 cells in series, parallel with another 10 cells in series.
System voltage / capacity::  12 VDC / App. 9 Ah
Estimated average operating time:  3 -> 5 hours. ( Continuous run.)
Minimum operating water temp: (Note 3) 50 *F ( 10 *C )

Note 1) Radio range limits the normal diving depth. The compartments and onboard compressed air system has been tested to endure 2.5 bar, the pressure at 82 ft. (25m.). 
To read more about WTC pressure calculation, click here.  
To read more about the compressed air system, click here.  
To read more about the radio range, click here. 

Note 2) The engine, regulator, receiver, 2 x servo, failsafes, 3 x valve are all counted as "1 part each", as I don't know the individual number of internal parts of these components. An estimate could be another 150 -> 200 parts.

Note 3) The minimum operating temperature is determined by the following factors:
A) As pressurized air absorbs heat when itís allowed to re-expand, the tubes just outside the tank is cooled. In order to prevent ice blocks inside the tubes caused by freezing moisture in the air, do not operate the sub in water below this temperature.
B) Batteries tend to decrease their capacity as temperature drops.






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