D, P.E., for hs amcable and devoted mentorng; To my wfe, Lauren, for her patence and understandng; And to God, for Hs blessngs every day. Compound bows are unquely dfferent from different types of bows n that they use a set of cables, cams and pulley, and two elastc lmbs that act as sprngs, to create a mechancal advantage whle the bowstrng s beng drawn. In what s known because the let-off (draw drive verses draw size) curve, ths permits the archer to carry the bow at a totally drawn size wth sgnfcantly much less force than the maxmum draw pressure. Ths desgn s advantageous for huntng, the place arrow speed, accuracy, and holdng weght turn into mportant requrements n beng profitable. Snce the nventon, expertise has progressed n mprovng the bow s effcency, accuracy, and arrow pace by patented emprcal strategies. Nevertheless, very lttle has been proven n analytcally modelng and optmal desgn of ths advanced mechancal system.
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A preface to varous types of bows in addition to subtypes of compound bows wll be ntroduced. A knematc analyss wll be proven for an eccentrc-crcular cam desgn and a onecam one-pulley desgn. By teratvely determnng the bow lmb, cam, and cable postons a relatonshp between the drawn size and drawn power wll produce a draw-drive curve. In truth, ths curve represents the stran energy saved wthn the system, and upon arrow release wll be transferred nto knetc energy. Lke all mechancal techniques, there s a loss n vitality and effcency. A method for precisely determnng effcency wll be explaned. Experments are also carried out usng carbon fber compostes to create an sufficient lmb desgn. Listing OF FIGURES.. v. CHAPTER I. INTRODUCTION Varieties of Bows Characterstcs of a Compound Bow Kinds of Compound Bows Motvaton Lterature Survey 10 II. Analysis OF SYMMETRIC CIRCULAR CAM DESIGN Introducton to Symmetrc Crcular Cam Analyss Determnng a Pont on an Eccentrc Crcle Geometry Analyss for Determnng Relevant Ponts 15.4 Force Dscusson. This da ta has been generated wi th the he lp of GSA C ontent Generator Demoversion !
19 III. Evaluation Of one CAM ONE PULLEY DESIGN Global Coordnate System Pont Analyss Power Analyss.. 5 IV. EXPERIMENTAL WORK Determnng Effcency of Compound Bow Carbon Fber Bow Lmb Manufacturng. 34 V. CONCLUSION AND FUTURE WORK REFERENCES. 6 A COMPOUND BOW MANUFACTURERS 4 B FIRESTORM LITE EFFICENCY Information. Forty three C BUCKMASTER BTR Efficiency Knowledge.. Forty four D Instruments AND Products Utilized in EXPERIMENTAL WORK.. 45 E BUCKMASTER BTR MEASURED CAM PROFILE forty six E1 SINGLE CAM (C1 Bottom, C Middle, C3 Prime).. Forty six E C1 CAM Knowledge. A hundred and ten Degrees RELATIVE TO C1 IN Direction OF ROTATION. Forty eight E4 C3 CAM Knowledge, -zero Degrees RELATIVE TO C1 IN Direction OF ROTATION.49 F BUCKMASTER BTR NUMERICAL Results Using MICROSOFT EXCEL.. Fifty one F1 CALCULATED Outcomes.. Fifty one F Power Outcomes. Foam Core forty one Experment 3; Earlier than Floor Post-processng (Sandng, Polshng) Experment 3; Sanded Pattern of Plan, 16 Undrectonal, Plan. Eight CHAPTER I INTRODUCTION 1.1 Forms of Bows The usage of an archery bow dates back to prehstorc tmes, but as frearms began to substitute bows as a mltary weapon n the 16 th century, the bows man function was for huntng and shoes; https://beautydrops.shop, recreaton.
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The archery bow could be classfed nto three categores: longbow, recurve bow, sneakers and compound bow. The longbow s the oldest of the three types. Long bows consst of a D-shaped physique that s connected to a strng cable. The body on a long bow serves as a handle assist and as an power storng lmb. Long bows measure approxmately the heght of a person. The longbow pctured n Fg.1 runs 78 nches n total length and Deals has a pull drive of 105 lbs at a three nch draw. The draw size s measured from the handle poston to the pont the strng connects to the arrow. Fgure 4 - Self-yew Englsh Longbow, 6.5ft ( The second kind of bow s the recurve. The recurve s drawstrng, unlke the longbow, comes n contact wth the bows lmb because the strng s beng drawn. The contact between lmb and strng permits for a dfferent relatonshp between the draw drive and the length of the drawstrng pulled.