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THRUST DEDUCTION DUE TO A PROPELLER BEHIND A HYDROFOIL
DAVID TAYLOR MODEL BASIN WASHINGTON DC
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A method which is based on Lagalls heorem is presented for computing the resistance augmentation, or thrust deduction, for submerged hydrofoil-propeller arrangements. The effect on the magnitude of thrust deduction of foil lift, propeller load, foil span, foil flap angle, and propeller-foil spacing was investigated. Computed examples and experimental thrust-deduction results for several hypothetical arrangements showed good agreement.
APPROVED FOR PUBLIC RELEASE