Arizona republican., 1918-03-31

For the first time since the per lection of the Liberty motor upon which the United States depends as a principal factor in winning the war, the details of the engine were made public recently by Charles F. Kette- ring before Delco-Light representa- lives in annual conyenthion at Day ton, Ohio.
 Kettering is the inventor of the first perfect wireless telephone. He Is interested in the devlopment of tn airship as a fighting factor in the war and has carried several mechani- cal devices to perfection.
 The details of the Liberty motor have been withheld pending it's abso lute reliability. According to Kette- ring it weighs S15 pounds. and de- Velops 440 horse power: less than two pounds per horsepower; weight. It is capable of carrying a 3,600- pound plane from the center of Day ton to the center of Miamisburg, a distance of 10 miles, in four minutes. Or it will carry the same machine to Columbus, 27 miles, in 30 minutes; to Indianapolis in 35 minutes, or to Chicago in three hours.
 ssWhat the future of the airplane will, be after the war I do not know, nor have I the slightest idea" said Kettering. AS one of a committee of r. men most interested in airplane construction at this time, 1 have given some thought to it. but I can state nothing definite. But l do know that airplane development has ad- Vanced wonderfully since the United States government has perfected the Liberty motor"
 This was his introduction to the statement of the details of the motors S weight and power.
 From this description he advanced to the airplane construction of the United States.
 Two types of planes are being made" he said. One is the training machine. It has two seats, has a speed of about 75 miles an hour, and is designed for elementary training of student aviators. At present avi- ators are being trained at the rate of 100000 student miles per day This means that if the average mile age of every student were added il would average about that sum total. ''The other machine is of the reg ulation fighting type. It is equipped with the perfected motor, capable of
 
 on the level, can climb two miles in seven minutes and a half.
 Different Types
 Of the several kinds of planes il use now there is the single seated machine that isn't so popular at pres ent. It carries every device that the two seated planes do, Ketering ex- plained, but there are few aviators capable and experienced enough tC handle it. Another type is the fight ing plane of the order Kettering de- scribed the United States is making, and a third popular with the Ger mans, is the pursuit machine. It i. called pursuit machine because it i: so designed that it can drop fastel than any other plane and has the ad vantage oyer the single seated ma chine, designed to maneuver, and tn, two seated machine. which canno drop as fast in a fight
 The pursuit machine is capable O 150 miles an hour on the level or POI miles on drop. The Germans us them almost exclusively.
 Other types are daylight bombing and night bombing machines. Tn daylight bombing machine is a gen eral utility affair. It can fight, an' tdIiltd IldIIlilt guns lOI lildl puI pose; it can take pictures of hostil lines. or can carry bombs for raidins The night bomber weighs about tw tons.
 kettering told of one of the achieve ments of the night-bomber. Leavin London, carrying six tons of repai stuff. 1t went to Italy and replace tho repairs with bombs. Dhence i went to Constantinople. bombed warship out of the water and ble, up the war college; returned to Italy took on it's repair outfits and wa back in London two days after de parture.
 Construction Plan Revealed
 McArthur Brothers of this cit have watched the development of tn Liberty motor with much interest, a they knew the important part tn Twin Six" motor of the Packar was playing in it's development. Ow ing to the governments wishes, n publicity has been given before a tO relationship between the Packar "Twin-Six" and the Liberty moto
 Now that it is perfected and in pro duction, tn public can be informed the work of the Packard Motor Ca company and Elmer $. Hare, pres dent of the Packard Moter Car con pany of New York, is authority fC inc statement that the Liberty ail uiane motor is the outcome of thrt years work on the part of Packai engineers.
 'When the engine was redesignt to meer~tbe requirements of cond tions on tne western battlefront" sa Mir Hare. French and British e,