Stability and control evaluation of the Pilatus Heli-porter model PC-6/350 airplane
McCullough, Martin L.
Manahan, Maurice H.
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An analysis of the static longitudinal and maneuvering stability and lateral controllability characteristics of the Pilatus "Heli-Porter" Model PC-6/ 350-H-l Airplane was conducted during the months of February, March, and April of 1966. This analysis was conducted at the Forrestal Airport, Princeton, New Jersey by graduate students of the Department of Aerospace and Mechanical Sciences of Princeton University. The "Heli-Porter" was tested at 8, 000 feet in the cruise and approach configurations both for power-on and power-off conditions to determine its stick fixed and stick free static stability characteristics. The maneuvering stability and stick forces per "g" gradient of the aircraft were evaluated for the power-on cruise condition; while its lateral performance was determined for the power-on cruise and approach configurations. From these evaluations, the "Heli-Porter" was found to have adequate stick fixed and stick free stability in the cruise and approach configurations both for the power-on and the power-off conditions. The aircraft also has excellent roll performance and a high level of maneuvering stability. However, its stick force per "g" and control forces in general are considered to be excessive if prolonged periods of maneuvering flight are anticipated. It was found that the c. g. limits set by the manufacturer were well forward of any neutral and maneuver points determined during this test. An analytical study was also conducted and showed very close agreement with flight test results.
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