Reanalysis of the Original Test Data for the Taylor Standard by Morton Gertler

By Morton Gertler

This booklet provides the result of the reanalysis of the Taylor normal sequence information, given in a sort which employs a very non-dimensional illustration. the key geometrical parameters used are beam-draft ratio, longitudinal prismatic coefficient, volumetric coefficient, and wetted-surface coefficient, the latter being redefinitions of Taylor’s displacement-length ratio and wetted-surface coefficient. The faired resistance information is given as curves of residual-resistance coefficient as opposed to Froude quantity. The Schoenherr frictional-resistance coefficient is a functionality of Reynolds quantity, in order that reimbursement for transformations in basin water temperature might be made through the use of the ideal kinematic viscosity within the computation of Reynolds quantity.

The scope of the sequence has been enlarged to incorporate a 3rd beam-draft ratio of 3.00 as well as the beam-draft ratios of 2.25 and 3.75 released in Taylor’s “Speed and tool of Ships”. those values have been got by way of interpolation, utilizing the transformed facts for the hitherto unpublished sequence 20 which had a beam-draft ratio of 2.92.

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The resulting faired contours a r e exemplified by F i g u r e 17. These contours showed a p r o g r e s s i v e i n c r e a s e of C, with Cv and were i n m o s t c a s e s very nearly linear. The s e t s of contours showing the v a r i a tion of C r with C, w e r e then c r o s s - f a i r e d with the sets of contours showing the variation of C, with Cp. This w a s accomplished by making minor adjustments i n each of the s e t s until f a i r e d c u r v e s were obtained which satisfied the condition that each point on the Cr v e r s u s c, contours was equal to the corresponding point on the C r v e r s u s 4.

It should be mentioned that, during the fairing p r o c e s s , special effort w a s made to a d h e r e as s t r i c t l y as possible t o the original data which w e r e c o r r e c t e d according t o the aforementioned p r o c e d u r e s . The humps and hollows n o r mally found in r e s i s t a n c e c u r v e s w e r e retained. It was FINAL PRESENTATION OF DATA The Taylor Standard S e r i e s was not only a comprehensive undertaking but a l s o one which involved a p r o g r a m of 30 used h e r e i n is t o make one type of presentation of the data which can be universally applied, t o suggest other methods of presentation, and t o provide auxiliary c u r v e s t o a s s i s t in rapid conversion of the generalized c u r v e s t o some of the other d e s i r a b l e specialized curves.

P Sv2 C , = K v ~ C , [18a] 2 R * = - -PS ( v I ) 2 c i = , 2 ? Experimental ExperimentalModel ModelBasin Basin theU. 0 >=Ik It should be mentioned that the r e s t r i c t e d channel c o r rections which' were applied to the Taylor Series data were generally found t o be quite small. The l a r g e s t correction amounted to a d e c r e a s e of approximately 2 percent of the predicted effective horsepower for a geometrically s i m i l a r 400-foot v e s s e l operating in salt water at a t e m p e r a t u r e of 59F.

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