The contrivances which are necessary to counteract the wind effects can only be understood by actual practice in the wind. - Otto Lilienthal

The difficulty of rising into the air increases rapidly with the size of the apparatus. The uplifting of a single person, therefore, is more easily attained than that of a large flying machine loaded with several persons.

The increasing size of the apparatus makes the construction more difficult in securing lightness in the machine; therefore the building of small apparatus is to be recommended.

Actual practice in individual flight presents the best prospects for developing our capacity until it leads to perfected free flight.