Resistance Tests of Models of Three Flying-Boat Hulls with a Length-Beam Ratio of 10.5
Abstract
Models of three flying-boat hulls, each with a length-beam ratio of 10.5, were tested at the Langley tank no. 1. The lines of these models were derived from the Deutsche Versuchsanstalt fuer Luftfahrt (DVL) standard series. The three models permitted tests with two depths of step and two angles of dead rise. Resistance, trimming-moment, and wetted-length data were obtained from general fixed-trim and free-to-trim tests at load coefficients ranging up to 4.0. The results showed that these three models had low hydrodynamic resistance at high load coefficients. At the free-to-trim hump, load-resistance ratios of 4.5 and 3.9 were attained at load coefficients of 1.5 and 3.5, respectively. Increasing the angle of dead rise, excluding chine flare, from 20 to 24.5 deg tended to increase the resistance and trimming moments at planing speeds. Changing the depth of step from 5 to 10 percent beam had little effect on the resistance. With conventional nacelle locations, excessive spray would enter the propellers at load coefficients over 3.0.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1945
- Accession Number
- ADA801346
Entities
People
- David M. Goldenbaum
- Jerold M. Bidwell
Organizations
- National Advisory Committee for Aeronautics