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Tank investigation of the Grumman JRF-5 airplane with a single hydro-ski and an extended afterbody

Description: Report presenting results from a tank investigation of a powered dynamic model of the Grumman JRF-5 airplane fitted with a single hydro-ski and extended afterbody. Results indicated that the afterbody extension in place of a tail ski reduced the maximum resistance by 10 percent. Removal of the wing-tip skids gave a further reduction in maximum resistance of 3 percent.
Date: August 7, 1951
Creator: Ramsen, John A. & Gray, George R.
Partner: UNT Libraries Government Documents Department

Tank Investigation of the Grumman JRF-5 Airplane Equipped with Twin Hydro-Skis: TED No. NACA DE 357

Description: A tank investigation has been conducted on a 1/8-size powered dynamic model of the Grumman JRF-5 airplane equipped with twin hydro-skis. The results of tests using two types of skis are presented: one had vertical sides joining the top surface to the chine; the other had the top surface faired to the chine to eliminate the vertical sides. Both configurations had satisfactory longitudinal stability although the model had a slightly greater stable elevator range available when the skis without the vertical sides were attached. Free model tests indicated no instability present when one ski emerged before the other. Considerable excess thrust was available at all speeds with either type of skis. A hump gross load-resistance ratio of 3.37 was obtained with the skis with the vertical sides and 3.53 with the other skis. Landing behavior in smooth water with yaw up to 15deg and roll up to 15deg in opposite directions was satisfactory with either type of skis.
Date: April 10, 1952
Creator: Ramsen, John A. & Gray, George R.
Partner: UNT Libraries Government Documents Department

Tank Investigation of the EDO Model 142 Hydro-Ski Research Airplane

Description: A tank investigation has been conducted of a 1/10-size powered-dynamic model of the Edo model 142 hydra-ski research airplane. The results of tests of two configurations are presented: One included a large ski and a ski well; the other, a small ski without a well. Water take-offs would be possible with the available thrust for either configuration: however, the configuration with the large ski emerged sooner and had less resistance from ski emergence until take-off. Longitudinal stability and landing behavior in smooth water were satisfactory for both configurations. Some alteration to the design of the tail would be desirable in order to reduce the spray loads.
Date: September 24, 1951
Creator: Ramsen, John A.; Wadlin, Kenneth L. & Gray, George R.
Partner: UNT Libraries Government Documents Department