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self bow
A self bow or simple bow is a bow made from a single piece of wood. Extra material such as horn nocks on the ends, or built-up handles, would normally be accepted as part of a self bow. Some modern authorities would also accept a bow spliced together in the handle from two pieces of wood.〔http://www.usarchery.org/userfiles/file/flight_primitive_rules.pdf UNITED STATES NATIONAL ARCHERY ASSOCIATION, FLIGHT COMMITTEE, PRIMITIVE BOW FLIGHT RULES, accessed 3 September 2008〕
== Advantages and disadvantages compared to composite bows ==
An effective self bow can be made from widely available local material in most inhabited parts of the world, with limited tools whose functions include chopping, shaving, and scraping. A day of work may be needed, starting with a seasoned stave; a composite bow requires a week's work, starting with a much greater range of materials and skills.〔Ottoman Turkish bows, manufacture and design. Adam Karpowicz (author and publisher). ISBN 978-0-9811372-0-9〕 However self bows must be long, approximately the height of the archer if they are to allow a long draw, and they are less efficient in the specialized art of flight archery. Well-designed composite bows of high draw-weight give higher arrow velocity, and the bow itself is shorter.
At the weights more usual for modern amateurs, the greater density of horn and sinew compared to wood usually cancels any advantage of composite construction. For most practical non-mounted archery purposes, self bows can perform as well as composite; "the initial velocity is about the same for all types of bow... within certain limits"〔http://www.bio.vu.nl/thb/users/kooi/kobe97.pdf An Approach to the Study of Ancient Archery using Mathematical Modelling. B.W. Kooi and C.A. Bergman. Antiquity 71:(271) 124-134 (1997)〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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