asked the Under-Secretary of State for Air the total weights of the engines installed in the airships R 100 and R. 101, respectively, with the approximate weight per horse-power of these engines?

The total weight of the petrol engines (with reversing gears) installed in It. 100 is 10,424 lbs., whilst that of the heavy oil engines in R. 101 was 23,300 lbs., giving approximate weights per horse-power of 2.9 lbs. and 7.96 lbs., respectively. The greater weight of the heavy oil engine is, however, more than counterbalanced on a long flight by its smaller fuel consumption.