Aerodynamic Characteristics of Three Deep-Step Planing-Tail Flying-Boat Hulls and a Transverse-Step Hull With Extended Afterbody
Abstract
An investigation was made to determine the aerodynamic characteristics in the presence of a wing of three deep-step planing-tail flying-boat hulls which differed only in the amount of step fairing. The hulls were derived by increasing the unfaired-step depth of a planing-tail hull of a previous aerodynamic investigation to a depth of about 92 percent of the hull beam. For the purpose of comparison, tests were also made of a transverse-step hull with an extended afterbody. The investigation indicated that the transverse-step hull with extended afterbody had about the same minimum drag coefficient, 0.0066, as a conventional hull and an angle-of-attack range for minimum drag of 3 deg to 5 deg. The hull with a deep unfaired step had a minimum drag coefficient of 0.0057; which was 14 percent less than the transverse-step hull with extended afterbody; the hulls with step fairing had up to 44 percent less minimum drag coefficient than the transverse-step hull. Longitudinal and lateral instability varied little with step fairing and was about the same as for a conventional hull.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1952
- Accession Number
- ADA377067
Entities
People
- John M. Riebe
- Rodger L. Naeseth
Organizations
- National Aeronautics and Space Administration