Page 144 - Practical Ship Design
P. 144
Weight-Bused Designs
10000
Remainder
Machy
1000
Weight
tonnes
100
2 3 4 5 6789 2 3 4 5 6789
1000 low0 1ooow
Total Main Engine MCR (kW)
Fig. 4.16. Weight of “remainder” of machinery weight versus main engine MCR (kW).
4.5.6 Weight oj‘diesel-electric installations - merchant ships
The plot of the total machinery weights of a number of diesel-electric installations
given as Fig. 4.17 showed that these could be represented fairly well by the
equation:
W,, = 0.72 (MCR)”.” (4.1 1)
where W,, = total machinery weight and MCR = aggregate MCR in kilowatts of all
generator machinery.
4.5.7 Approximate machinery weight - warships
Although the ideas presented in the previous paragraphs of this section were
originally developed for merchant ships, the same procedure can be used for
warships with the weight of the propulsion machinery and the remainder being
estimated separately.
