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    That airplane will be inexpensive to operate must reasonably follow from the small power needed for their propulsion and from the fact that they have no working parts in constant destructive contact with a roadway. Indeed, the transition from the expedient of confining air in automobile tires to the utilization of the unconfined air of the atmosphere as a vehicle support is rather definitely an advance from a lower to a higher order of engineering. 
    Questions of safety are ever uppermost in most persons' contemplation of aerial travel. To the average individual let their be said airplane and at once his brain must visualize some horrifying conception of an unstable craft of vague outlines and terrible hazards, precariously poised in the sky, piloted by some sort of superman with the skill of a tight rope walker, and about to crash to earth with the least relaxation of control. To the layman motor failure means disaster. As a matter of fact, there are many more factors of safety in present and prospective aerial travel than at first appear, even to the well informed. First, there is the complete stability of the glider type. The immediate safety, this means, is not contingent upon the operation of the motor. On the contrary, a motor is necessary only to maintain continues upward and horizontal travel, the ability to soar reliably at a flat angle down a slant of air being contingent only upon the continued structural integrity of non-moving elements, or at worst, of elements easily made very strong or even provided in duplicate, and demanding only moderate and occasional control adjustment against very light stresses. Thus, to be compelled by engine