Show LIBERTY MOTOR SUPERIOR progress in aviation in the last decade decad e has been prodigious when based upon the comparative ratios of loads and lifting power the first man carrying airplane flights were made in december 1903 1903 with the wright brothers engine deve developing lopint twelve pounds or horsepower and weighing in 1910 or pounds per horsepower the average horsepower seven years later of aeronautic engines had iacre increased ased to fifty to 57 pounds decreased four and the e weight horsepower says the scientific fie ameri per 1917 the average in another seven years can output had advanced to horsepower and the weight decreased to 28 pounds per horsepower horse power in march 1918 the liberty 12 developed horsepower for a weight of pounds or pounds per horsepower at the present time the liberty 12 is yielding a maximum of horsepower for a weight of pounds or pounds per horsepower the following table shows the advance in the average power weight ratio by years for engines in actual flying use it is to be especially noted that the langley manley engine built in 1901 was nine years ahead of its time in the matter of power output and sixteen years ahead in Us its per horsepower in 1917 the Liberty 12 was 65 per cent more powerful and 28 per cent lighter per horsepower than the average in service for that year so far this year these figures are probably changed to 50 per cent and 25 per cent respectively which indicate the advance of the liberty over the average engine in service at the present time N wt tt per year HP wt HP langley manley 1901 52 29 original wright bros 1903 12 wright bros 1904 16 improved wright bros 19 95 redesigned wright bros 35 55 average on market 1910 54 57 wolseley engine 1913 49 average on market 1914 29 average on market 1915 38 average on mar market lizet 1916 31 average on market 1917 as liberty 12 1917 20 liberty 12 march 1918 SOS 19 liberty 12 may 1918 18 the average consumption of fuel decreased from about 8 pound per horsepower in 1903 to about 65 pound in 1914 since which it has slowly dropped to 55 pound in 1918 and for the liberty to 50 pound the present liberty consumption is approximately 46 pound per horsepower hour illustrating the advance made the wolseley company in 1913 could only obtain horsepower at 1400 revolutions per minute from f born eight cylinders five inches bore by seven inches stroke or horsepower per pel cylinder this is the same sized cylinder as used in the liberty which now give horsepower at 1800 revolutions per minute from twelve cy cylinders linders which is double the power per cylinder obtained in the wolseley even if we reduce the liberty results to the same speed as the wolseley that is 1400 revolutions the liberty still represents a great advance for at that speed horsepower are developed or horsepower per cylinder moreover the wolseley weighed 49 pounds per horsepower as compared with 23 pounds for the liberty at the same speed or 1400 revolutions per ini minute nute |