Abstract
The chapter summarizes the fundamentals for the ACV and SES propulsor selection. It also discusses issues that need to be considered when selecting supporting components to achieve the designer's overall objective—an efficient and readily maneuverable craft. The main design issue for air propulsion is to minimize the propulsor diameter, while obtaining the desired efficiency for minimized power and an acceptably low emitted noise level. A propeller or a fan blade tip speeds tend to be high. The main challenge for design of these systems is reliable traction over the usually difficult terrain and control of vehicle track when it is on a slope. The ideal efficiency and the characteristics discussed are based on the assumption that the only loss of energy is that represented by the kinetic energy of the slipstream along the propeller axis. The power transmission system in an SES or ACV should be designed with minimum weight in mind. The main design considerations are the craft drag, mainly skirt contact drag over the appropriate terrain, which determines the pulling force, wind forces on the platform, and gravitational forces when climbing or traversing slopes over land.
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