H.P. = Tc × V,
550

then from (1)

Tc × V × 550
550
 Tc × V
Vc = = ,
WW

thence,

Tc = Vc × W.
V

Whether T means drifts, head resistance and thrust for climbing, or drift and head resistance only, the following calculation is the same, only in the latter case, of course, we must add the horse-power required for climbing to the result to obtain the total horse-power.

Now, when we know the total thrust, we shall find the horse-power in the following manner:

We know that the

H.P. = P r 2π R
75 × 60

in kilograms, or in English measure,