Report No. 648, Design charts for predicting downwash angles and wake characteritics behind plain and flapped wings: by Abe Silverstein and S. Katzoff. 25 pages, illustrations, 23 × 29 cms. Washington, Government Printing Office, 1939. Price 15 cents

• Publisher: Elsevier Science
• Year: 1939
• Tongue: English
• Weight: 64 KB
• Volume: 227
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(39)90757-x

✦ Synopsis

BOOK REVIEWS. 58I

Propeller-design charts-and methods of computing propeller thrust are included.

Report No. 648, Design Charts for Predicting Downwash Angles and Wake Characteristics Behind Plain and Flapped Wings, by Abe Silverstein . and S. Katzoff. 25 pages, illustrations, 23 X 29 cms. Washington, Government Printing Office, 1939. Price 15 cents. Equations and design charts are given for predicting the downwash angles and the wake characteristics for power-off conditions behind plain and flapped wings of the types used in modern design practice. The downwash charts cover the cases of elliptical wings and wings of taper ratios I, 2, 3, and 5, with aspect ratios of 6, 9, and I2, having flaps covering o, 4 o, 7o, and Ioo per cent of the span. Curves of the span load distributions for all these cases are included. Data on the lift and the drag of flapped airfoil sections and curves for finding the contribution of the flap to the total wing lift for different types of flap and for the entire range of flap spans are also included. The wake width and the distribution of dynamic pressure across the wake are given in terms of the profile-drag coefficient and the distance behind the wing. A method of estimating the wake position is also given.

The equations and the charts are based on theory that has been shown in a previous report to be in agreement with experiment.