Fuel consumption 12 tons + 9 tons additional = 21 tons.

Lift available for fuel and freight = 42 "
Fuel carried = 21 "
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Balance for freight = 21 "
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It will thus be seen that at the faster speed small commercial
loads can be carried by L 70 and R 38 and not at all in the case
of R 33, that is assuming, of course, that the extra fuel is
carried, of which 75 per cent of the total does not appear at all
excessive in view of the weather continually experienced over the
Atlantic.

At the cruising speed the loads naturally increase but still, in
L 70, and more particularly in R 33, they are too small to be
considered commercially. In R 38, however, the load that can be
carried at cruising speed is sufficient to become a commercial
proposition.

From this short statement it is evident that, by a comparatively
small increase in volume, the lifting capacity of an airship is
enormously increased, and it is in this subject that the airship
possesses such undoubted advantage over the aeroplane. In the
heavier-than-air machine there is no automatic improvement in
efficiency resulting from greater dimensions. In the airship,
however, this automatic improvement takes place in a very marked
degree; for example, an airship of 10,000,000 cubic feet capacity