Hi Bob,

In the book "The Ship Magnificent." It show a different lifeboat plates

The 14 main lifeboats :Load Plates 30.0 9.0 x 4.0. 64P.

The 2 cutters lifeboats: Load plates. 25.0 7.0 x 3.0. 33P.

The 4 collapsible lifeboats: Load Plates 28.0 8.0 x 3. 40P

So which one is right?

Hello Mike.

The figures shown in that book are rounded-up to be practical. In fact, the BoT Rule for determining the capacity of a boat was to allow 10 cubic feet per individual. The plates simple showed arithmetic capacity...hardly practical.

Boat capacity rating was 10 cu ft/person. Hence a boat with the cubic of 648 was rated at 64.8.

The capacities in the Book are rounded up and practical. In practice, the capacity is found by multiplying the length x breadth times depth times the Coefficient of Fineness and dividing it by 10.

The C of F was the ratio of the boat's shape to a rectangular boat of the same dimensions. In the case of Titanic's big boats, it was 0-633.

The inside volume of a rectangular boat of the same dimensions is 1080 cubic feet, therefore, such a boat would hold 108 persons using the BoT Rule.

The fact that Titanic's boat was rated for 64.8 persons tells us that her boat was 0,633% the shape of a rectangular boat. These were what was termed "fine" boats. fatter boats would have had a C of F of closer to 0.75%.

Hope this helps.