Accession Number : AD0430063


Title :   A study of rough-terrain-induced structural landing loads. Phases 1 and 2


Corporate Author : DOUGLAS AIRCRAFT CO LONG BEACH CA


Personal Author(s) : Allen, F C ; Rehder, D M ; Mosby, L B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/430063.pdf


Report Date : Dec 1963


Pagination or Media Count : 184


Abstract : An investigation was made of the effect of rough terrain on the loads, weights, and performance of the OV-1 airplane during landings. The load calculations, which were conducted on an IBM 7090 computer, considered the internal operating mechanism of the landing gear and the flexibilities of the gear and structure as a mutually interacting dynamic system. The equations of motion and certain details of the computer program are provided. A determination was made of the terrain roughness at which modification to the airplane was considered necessary and the terrain roughness at which the reduced performance of the OV-1 airplane, due to increased weight, became equal to or inferior to a VTOL aircraft of equal weight. This work was concerned with the determination of maximum loads and corresponding weight and performance penalties; however, observations were made regarding the importance of repeated loads during landing or taxiing on surfaces with multiple irregularities. The primary results of the investigation show the terrain roughness at which structural reinforcement is considered necessary and the terrain roughness at which the performance of the airplane becomes equal to that of a VTOL aircraft of the same weight.


Descriptors :   *AIRCRAFT LANDINGS , LANDING GEAR , LANDING IMPACT , LOADS(FORCES) , STRUCTURES , TERRAIN , WEIGHT


Subject Categories : Military Aircraft Operations


Distribution Statement : APPROVED FOR PUBLIC RELEASE