MECHANICAL HYDROFOIL CONTROL SYSTEM PRELIMINARY DESIGN STUDY PROGRAM
RADIO CORP OF AMERICA BURLINGTON MA DEFENSE ELECTRONIC PRODUCTS
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Methods were investigated for improving the open loop behavior of hydrofoil craft with emphasis on three different foil suspension techniques and to conduct feasibility and preliminary design studies applying these techniques to the Bureau of Ships 15-ton high-speed test craft FRESH for stabilization and control, both manually and automatically, in a State 3 Sea. The three suspension techniques are basically mechanical in nature and have the property of providing a non-rigid connection in one degree-of-freedom between the foil and the hull. In the case of the sprung or heaving foil, roughly vertical heaving can be used to minimize angle-of-attack variations normally induced by wave orbital motion. The freedom to rotate of the pivoted or hinged foil and the kite foil gives these configurations the potential for reducing in duced angle-of-attack variations. Preliminary studies of these three basic foil suspension schemes were conducted to determine their relative merits with respect their ability to counteract the influences of wave particle orbital motion disturbances on the foil and minimize the resulting forces on the hull. Stability with regard to individual foil response was considered, particularly for the case of the kite foil in supercavitating flow.
- Marine Engineering