Besides this, I had to consider in actual flight the air resistance due to the guy wires and hull, but after making an allowance of as much as three-quarters for these differences between the conditions of experiment and those of free flight, I hoped that 1 horse-power would serve to carry 30 pounds through the air if a supporting surface as large as 3 feet to the pound could be provided, and this was the basis of the construction which I will now describe. The general form of this Aerodrome No. 0, without wings or propellers, is shown in the accompanying photograph in Plate 10. Its dimensions and its weights, as first designed, and as finally found necessary, are as follows: COMPARISON OF ESTIMATED AND ACTUAL WEIGHTS OF PARTS OF AERODROME “0”--IN POUNDS AND OUNCES. Estimated Actual lbs. oz. lbs. oz. Engines 4 0 4 1 Boilers and Burners 8 11 13 14 Pumps and Attachments 0 0 1 10 Steering Apparatus 0 6 0 0 Frame of Hull and Braces, including bowsprit and tail tube 7 7 8 11 Oil tank covering and pipes 0 0 0 13 Shafts, ball bearings (2:1) and wooden propellers (1:7) 1 14 3 8 Wings (5:4) and guys (0:9) 4 0 5 13 Tail 1 5 2 2 Jacket at prow 0 0 4 0 --------- --------- Total without oil or water 27 11 44 8 (The weights attained in the actual making were, as is seen, nearly double those first estimated, and this constant increase of weight under the exigencies of construction was a feature which could never be wholly eliminated.) [p032] After studying various forms for the hull or body of the prospective aerodrome, I was led to adopt the lines which Nature has used in the mackerel as most advantageous so far as the resistance of the air was concerned, but it proved to be difficult in construction to make the lines of the bow materially different from those of the stern, and in this first model the figure was symmetrical throughout.