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Applicability of the Capstan Equation to Guitar Strings

Groves Tom, Kemp Jonathan A.

Archives of Acoustics

2019

Vol. 44, No. 3

459--465

The effects of friction were observed in electric guitar strings passing over an electric guitar saddle. The effects of changing the ratio of the diameter of the winding to the diameter of the core of the string, the angle through which the string is bent, and the length on either side of the saddle were measured. Relative tensions were deduced by plucking and measuring the frequencies of vibration of the two portions of string. Coefficients of friction consistent with the capstan equation were calculated and were found to be lower than 0.26 for wound strings (nickel plated steel windings on steel cores) and lower than 0.17 for unwound (tin plated steel) strings. The largest values of friction were associated with strings of nar rower windings and wider cores and this may be due to the uneven nature of the contact between the string and saddle for wound strings or due the surface of the windings deforming more, encouraging fresh (and therefore higher friction) metal to metal contact. It is advised to apply lubrication under the saddle to string contact point after first bringing the string up to pitch rather than before in order to prevent this fresh metal to metal contact.

Kabestany - budowa, problemy eksploatacyjne oraz wpływ na bezpieczeństwo żeglugi

Cioch A., Przepiórski B.

Przegląd Mechaniczny

2015

nr 7-8

52--54

W artykule przedstawiono budowę kabestanu na przykładzie dwubiegowego modelu Lewmar 44. Omówiono korzyści wynikające ze stosowania kabestanów. Pokazano problemy przy eksploatacji dwubiegowego kabestanu Lewmar 44. Zaprezentowano także zagadnienie dotyczące poprawy bezpieczeństwa żeglugi dzięki kabestanom.

The article contains a description of structure of a capstan (sailing winch) on the example of a two speed Lewmar 44 model. The paper also describes the advantages of using capstans and the issues of their exploitation including ideas aiming to improve the safety of sailing.