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Download PDF, EPUB, MOBI Correlation of the Trim Limits of Stability Obtained for a Pb2y-3 Flying Boat and a 1/8-Size Powered Dynamic Model

Correlation of the Trim Limits of Stability Obtained for a Pb2y-3 Flying Boat and a 1/8-Size Powered Dynamic Model by Nasa Technical Reports Server (Ntrs)

Correlation of the Trim Limits of Stability Obtained for a Pb2y-3 Flying Boat and a 1/8-Size Powered Dynamic Model
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Author: Nasa Technical Reports Server (Ntrs)
Page Count: 22 pages
Published Date: 27 Jun 2013
Publisher: Bibliogov
Publication Country: United States
Language: English
ISBN: 9781289059965
File size: 33 Mb
Download Link: Correlation of the Trim Limits of Stability Obtained for a Pb2y-3 Flying Boat and a 1 8-Size Powered Dynamic Model
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Tests of a PB2Y-3 flying boat were made at the U.S> Naval Air Station, Patuxent River, Md., to determine its hydrodynamic trim limits of stability. Corresponding tests were also made of a 1/8-size powered dynamic model of the same flying boat in Langley tank no. 1. During the tank tests, the full-size testing procedure was reproduced as closely as possible in order to obtain data for a direct correlation of the results. As a nominal gross load of 66,000 pounds, the lower trim limits of the full-size and model were in good agreement above a speed of 80 feet per second. As the speed decreased below 80 feet per second, the difference between the model trim limits and full-scale trim limits gradually became larger. The upper trim limit of the model with flaps deflected 0 deg was higher than that of the full-size, but the difference was small over the speed range compared. At flap deflections greater than 0 deg, it was not possible to trim either the model of the airplane to the upper limit with the center of gravity at 28 percent of the mean aerodynamic chord. The decrease in the lower trim limits with increase in flap deflection showed good agreement for the airplane and model. The lower trim limits obtained at different gross loads for the full-size airplane were reduced to approximately a single curve by plotting trim against the square root of C(sub delta (sub o)) divided by C(sub V).

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