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

By Morton Gertler

This e-book offers the result of the reanalysis of the Taylor typical sequence information, given in a sort which employs a totally non-dimensional illustration. the main 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 facts 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 repayment for changes in basin water temperature could be made by utilizing the best 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 those values have been received through interpolation, utilizing the remodeled information for the hitherto unpublished sequence 20 which had a beam-draft ratio of 2.92.

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92 used on the original models. This was done to provide a n even value f o r interpolation purposes in the final p r e s e ntati on. o It would be of i n t e r e s t t o compare the r e s u l t s obtained f r o m the r e a n a l y s i s of the original Taylor S e r i e s data with modern t e s t r e s u l t s of Taylor S e r i e s models. The ~ r e s i d u a l - r e s i s t a n c e coefficients f o r these models a r e compared in F i g u r e 18 with the values interpolated f r o m Appendices 3 and 4.

The method selected to compensate f o r the r e s t r i c t e d channel effects was the s e m i - e m p i r i c a l method of Refe r e n c e 7. Since this procedure was developed for the general c a s e , it i s somewhat cumbersome for application t o a l a r g e m a s s of data. The existence of c e r t a i n fixed p a r a m e t e r s in the p r e s e n t c a s e h a s enabled the development of the following new procedure which greatly simplifies the r e s t r i c t e d channel c o r r e c t i o n s in calculations of this kind.

T o e s t i m a t e t h es e t e m p e r a t u r e s , the c h a r t of Figur e 1 2 w a s p r e p a r e d showing the w a t e r t e m p e r a t u r e in the Experi m e n t al Model Basin v e r s u s c a l e n d a r date. The c h a r t c o v e r s a fi v e -y e ar period (1913-1918) beginning with the t i m e whenthe t e m p e r a t u r e was f i r s t r e c o r d e d at the Exper i m en t a l Model B as i n and e m b r a c e s the t e m p e r a t u r e values re co rd ed f o r the l a t e r T a y l o r S e r i e s models.

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