Where did Greenhill's twist rule come from? |
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| Affiliation: | 1. Dept. of Aerospace Engineering, Chonbuk National University, 567 Baekje-daero, Duckjin-gu, Jeonju, Jeonbuk 561-756, Republic of Korea;2. Dept. of Mechatronics Engineering, Chonbuk National University, 567 Baekje-daero, Duckjin-gu, Jeonju, Jeonbuk 561-756, Republic of Korea;3. LANL-CBNU Engineering Institute Korea, Chonbuk National University, 567 Baekje-daero, Duckjin-gu, Jeonju, Jeonbuk 561-756, Republic of Korea;1. School of Anatomical Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, 2193, Johannesburg, South Africa;2. Department of Anatomy, Des Moines University, Des Moines, IA, USA;3. Faculté des Sciences, University of Kisangani, B.P 1232 Kisangani, Congo;4. Department of African Zoology, Royal Museum for Central Africa, Leuvensesteenweg 13, B-3080 Tervuren, Belgium;5. Laboratory of Histology and Neuropathology, Université Libre de Bruxelles, 1070 Brussels, Belgium;6. Department of Anthropology, University of Arkansas, Fayetteville, AR 72701, USA;1. School of Economics and Management, Shanghai University of Electric Power, Shanghai 200090, PR China;2. School of Management, University of Shanghai for Science of Technology, Shanghai 200090, PR China;3. School of Computer Science, Fudan University, Shanghai 200433, PR China |
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| Abstract: | Greenhill's Rule for estimating rifling twist in artillery and small arms is interesting both because of its simplicity and longevity. This article describes (a) Greenhill's Simplified Rule for estimating the twist of rifling; (b) describes his original, more complete, but much less known Rule; (c) summarizes how he got the Rule; and (d) relates it to the modern stability factor. Some comments about twist, bullet stability, and black powder velocities are presented. |
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