SMOOTH-WATER TESTS OF MODEL 4990 REPRESENTING A 36-FOOT RIVER PATROL BOAT.
Abstract
Tests, using TMB Model 4990, were made in Langley Tank No. 1 to determine the performance characteristics of a 36-Foot River Patrol Craft. Model 4990 is a revision of Model 4974 which had a deep tunnel forward. This tunnel was instrumental in collecting air under the hull, lowering the effectiveness of the propulsion screws. Model 4990 had the forward tunnel removed and replaced by a convex section terminating in a blunt bow. The tests indicate that no air was entrained under the bow of the modified model, but the EHP at the design operating conditions was increased. Spray over the bow and side of the model was eliminated by use of spray strips. Test results for two displacements with and without spray strips are presented. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1964
- Accession Number
- AD0607692
Entities
People
- Lawrence Benen