Novel civil cargo ship, 8.10.2020

 

Novel civil cargo ship, 8.10.2020

Author: David Judbarovski, systems engineering, principle invetor, retired

judbarovski@gmail.com

 

Key ideas of my concept of a sea transport of 360 km/h and 6500 ton, breaking all stereotypes, and its theoretical consideration you can see in “Novel fast and heavy ship, Corrected on 5.10.2020”, judbarovski.blogspot.com/2020/10 , was posted on 8.10.2020.

 

Here I consider it as a civil cargo ship at 120 km/h.

Its recommended dimensions are about 6 m draft submerged, 10 m beam submerged and 10 m nose length tilted back and submerged.

At 120 km/h and 6,500 dwt, its power consume would be about 25,000 kW, while conventional ship of the same velocity and the same dimensions would be enormous near million kW, or 40 times bigger.

Conventional civil cargo ships were known as the most economical kind of transportation. Fuel consume of them is proportional to velocity squared. And for more heavy ships and at more smaller velocity it can be seemed out of competition.

Nevertheless, such ships are very expensive thing.  

As result, my ship can be more preferable as a fast transport and by economics point of view..

About decade ago I had found that market prices of typical cargo ship could be approximately estimated as Q (USD) = ~DWT * sea steel price USD/ton * k. The steel prices are quite conservative, now it being ~ USD 640/ton, and k = 2 (from 1.4 to 2.5 for most of sea ships) and can vary depended on a health of the world economics, while navy ships prices are shamelessly overstated and growing rapidly from year to year.   

For example

I can suppose my ship is 1.5 times more expensive per DWT unit than typical Handysize conventional ships, and for very large one – 1.8 times  

For comparison of my ship with different conventional ones:

(1) High speed cargo ship

48,000 dwt, 32,000 kW, 25 knots = 46 km/h

(6,500 / 48,000) * (120 / 46) = 0.35

(0.35 * 48,000) / (6,500 * 1.5) = 1.72 times better by capital cost

25.000 / (0.35 * 32,000)  = 2.2 times more fuel consume 

(2) Low speed cargo ship

49,000 dwt, 13 knot = 24 km/h, 27 TO/d ~= 5,300 kW  

(6,500 / 49,000) * (120 / 24) = 0.66

(0.66 * 49000) / (6500 * 1.5) = 3.3 times better by capital cost

25,000 / (0.66 * 5,300) = 7.0 times more fuel consume  

(3) Very Large cargo ship of low speed

185,000 dwt, 12,700 kW, 13 kn = 24 km/h

(6500 /185,000) * (120 / 24) = 0.175

(0.175 * 185000) /(6500 * 1.8) = 2.8 times better by capital cost, 

25,000 / (0.175 *12,500) = 11.4 times worse by fuel consume

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