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Herr Otto Lilienthal seems to have been the first man who really comprehended that balancing was the first instead of the last of the great problems in connection with human flight. He began where others left off, and thus saved the many thousands of dollars that it had theretofore been customary to spend in building and fitting expensive engines to machines which were uncontrollable when tried. He built a pair of wings of a size suitable to sustain his own weight, and made use of gravity as his motor. This motor not only cost him nothing to begin with, but it required no expensive fuel while in operation, and never had to be sent to the shop for repairs. It had one serious drawback, however, in that it always insisted on fixing the conditions under which it would work. These were, that the man should first betake himself and machine to the top of a hill and fly with a downward as well as a forward motion. Unless these conditions were complied with, gravity served no better than a balky horse — it would not work at all...
We figured that Lilienthal in five years of time had spent only about five hours in actual gliding through the air. The wonder was not that he had done so little, but that he had accomplished so much. It would not be considered at all safe for a bicycle rider to attempt to ride through a crowded city street after only five hours’ practice, spread out in bits of ten seconds each over a period of five years; yet Lilienthal with this brief practice was remarkably successful in meeting the fluctuations and eddies of wind gusts. We thought that if some method could be found by which it would be possible to practice by the hour instead of by the second there would be hope of advancing the solution of a very difficult problem.
--
Speech to the Western Society of Engineers (18 September 1901); published in the Journal of the Western Society of Engineers (December 1901); republished with revisions by the author for the Annual Report of the Board of Regents of the Smithsonian Institution (1902)

 

Wilbur Wright

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Of all the men who attacked the flying problem in the 19th century, Otto Lilienthal was easily the most important. ... It is true that attempts at gliding had been made hundreds of years before him, and that in the nineteenth century, Cayley, Spencer, Wenham, Mouillard, and many othcrs were reported to have made feeble attempts to glide, but their failures were so complete that nothing of value resulted.

 

Otto Lilienthal

 

Hours of research can cut months of field work. (Full quote: In today's world, time is the most expensive part of an expedition. Man hours spent in the archives can cut hundreds of thousands of dollars worth of time from the field phase of most projects.)

 

E. Lee Spence

 

Lilienthal’s enthusiastic efforts to arouse others may yet prove his most valuable contribution to the solution of the problem. What one man can do himself directly is but little. If however he can stir up ten others to take up the task he has accomplished much.

 

Wilbur Wright

 

Particular honour belongs to those who believed in the possibility of mechanical flight when all the world was against them; not the visionaries because they hoped for it merely, but those who by sheer force of intellect perceived the means by which it could be accomplished and directed their experiments along the right path. ... The name of Lilienthal is now among the most honoured, but curiously his own countrymen were the last to recognize the value of his work.

 

Otto Lilienthal

 

Please don't say lightly that these are just religious concepts and not practical. These are laws governing human conduct, which apply as rigidly as the law of gravity. When we disregard these laws in any walk of life, chaos results. Through obedience to these laws this world of ours will enter a period of peace and richness of life beyond our fondest dreams.
The key word for our time is practice. We have all the light we need, we just need to put it into practice.

 

Peace Pilgrim