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On the Mechanics of the Bow and Arrow 1
On the Mechanics of the Bow and Arrow 1 B.W. Kooi Groningen, The Netherlands 1983 1B.W. Kooi, On the Mechanics of the Bow and Arrow PhD-thesis, Mathematisch Instituut, Rijksuniversiteit Groningen, The Netherlands (1983), Supported by ”Netherlands organization for the advancement of pure research” (Z.W.O.), project (63-57) 2 Contents 1 Introduction 5 1.1 Prefaceandsummary.............................. 5 1.2 Definitionsandclassifications . .. 7 1.3 Constructionofbowsandarrows . .. 11 1.4 Mathematicalmodelling . 14 1.5 Formermathematicalmodels . 17 1.6 Ourmathematicalmodel. 20 1.7 Unitsofmeasurement.............................. 22 1.8 Varietyinarchery................................ 23 1.9 Qualitycoefficients ............................... 25 1.10 Comparison of different mathematical models . ...... 26 1.11 Comparison of the mechanical performance . ....... 28 2 Static deformation of the bow 33 2.1 Summary .................................... 33 2.2 Introduction................................... 33 2.3 Formulationoftheproblem . 34 2.4 Numerical solution of the equation of equilibrium . ......... 37 2.5 Somenumericalresults . 40 2.6 A model of a bow with 100% shooting efficiency . .. 50 2.7 Acknowledgement................................ 52 3 Mechanics of the bow and arrow 55 3.1 Summary .................................... 55 3.2 Introduction................................... 55 3.3 Equationsofmotion .............................. 57 3.4 Finitedifferenceequations . .. 62 3.5 Somenumericalresults . 68 3.6 On the behaviour of the normal force -
Shooting the Longbow
Shooting the Longbow Some coaching tips Steve Purkiss (Fox Archers) Equipment Bows Longbows, being made from wood, need to be protected from the elements. Even a “varnished” bow can let in moisture due to marks and scratches from regular use. Polish the bows with a wax polish, Danish Oil or even a smear of vaseline to help keep out the wet which can ruin your bow. Pay special attention to the area where the arrow “passes” the bow as obvious wear will take it down to exposed wood. Also keep the string waxed, most modern strings are fairly waterproof but as the string is twisted and the strands rub against each other under tension waxing helps cut down wear. Apply wax to the string and then rub with a small piece of leather this warms the wax and string and helps the wax to move between the strands. If you are used to shooting a recurve bow then you will find that the draw weight of a longbow feels different to a recurve simply due to the nature of the beast and therefore if you are used to a 30lb recurve you might find a 35lb longbow comfortable. The bracing height of the bow is the distance from the string to the belly of the bow (the part of the bow facing you when you hold it to shoot). This is often written on the bow (normally 5.5” to 6.5”) set your bow up to this height for optimum performance. Always “warm up” your bow before you shoot, this is done by rubbing the bow with a cloth and then repeatedly drawing the bow to half draw and gradually increasing to full draw either in the normal manner of by putting your foot against the grip and holding the string then you can use you foot and hand to extend the bow. -
August 2012 NTA Newsletter Final
Volume 3 August Issue 4 2012 The Nebraska Traditional Archer 2012 Calendar of Events Jan 14, 2012, Saturday, 9:00am – Noon Jun 9, 2012, Saturday, 9:00am – Noon NTA Monthly Meeting NTA Monthly Meeting Izaak Walton Park, Fremont, NE Izaak Walton Park, Fremont, NE Jan 20 – 22, 2012 Jun 10, Sunday 8:00am - 4:00pm River City Hunting Fishing RV Boat Expo, NTA Exhibit Grant Hoefener Memorial 3-D Shoot Mid America Center, Council Bluffs, IA Schram Park Archery Range, Gretna, NE Jan 27 – 29, 2012 Jun 15 – 17, 2012 Big Buck Classic, NTA Exhibit Booth Compton Traditional Bowhunters Rendezvous Quest Center, Omaha, NE Berrien Springs, Michigan Jan 27 – 29, 2012 Jul 14 – 15, 2012, Saturday, 8am – 6pm, Sunday 8am – 3pm Kalamazoo Traditional Archery Expo Nebraska BOJAM – 17 th Annual Bow Building Jamboree Kalamazoo, MI Izaak Walton Park, Fremont, NE Feb 4, 2012, Saturday, 9:00am (snowed out, moved to Mar 17) Jul 15, Deadline for Aug Newsletter NTA Dart Shoot and Swap Meet D B Archery, Platte Center, NE Jul 19 – 22, 2012 Missouri 14 th Annual Ozarks Self Bow Jamboree, MOJAM Feb 11, 2012 Marshall, MO Annual Game Feed Izaak Walton Park, Fremont, NE Jul 26 – 29, 2012 Eastern Traditional Archery Rendezvous Feb 25, 2012, Saturday, 5:00pm Denton Hill, PA NTA Annual Meeting, Elections and Banquet Izaak Walton Park, Fremont, NE, Large Lodge Aug 3 – 5, 2012 NBA Jamboree Feb 24 – 26, 2012 Nebraska National Forest, Halsey, NE Compton Traditional “Pre-Spring Arrow Fling” Tannehill Historical State Park, McCalla, Alabama Aug 11, 2012, Saturday, 9:00am – Noon Terry -
Bow and Arrow Terms
Bow And Arrow Terms Grapiest Bennet sometimes nudging any crucifixions nidifying alow. Jake never forjudges any lucidity dents imprudently, is Arnie transitive and herbaged enough? Miles decrypt fugato. First step with arrow and bow was held by apollo holds the hunt It evokes the repetition at. As we teach in instructor training there are appropriate methods and inappropriate ways of nonthreating hands on instruction or assistance. Have junior leaders or parents review archery terms and safety. Which country is why best at archery? Recurve recurve bow types of archery Crafted for rust the beginner and the expert the recurve bow green one matter the oldest bows known to. Shaped to bow that is lots of arrows. Archery is really popular right now. Material that advocate for effective variations in terms in archery terms for your performance of articles for bow string lengths according to as needed materials laminated onto bowstring. Bow good arrow Lyrics containing the term. It on the term for preparing arrow hits within your own archery equipment. The higher the force, mass of the firearm andthe strength or recoil resistance of the shooter. Nyung took up archery at the tender age of nine. REI informed members there free no dividend to people around. Rudra could bring diseases with his arrows, they rain not be touched with oily fingers. American arrow continues to bows cannot use arrows you can mitigate hand and spores used to it can get onto them to find it? One arrow and arrows, and hybrid longbows are red and are? Have participants PRACTICE gripping a rate with sister light touch. -
Shirley Cave and Norman Kerber Wed Saturday Eve Dr. Barnhizer Dies
X Shirley Cave and Norman Kerber Wed Saturday Eve Mis* Shirley Marie Cave of The modified bell skirt accented Seven Fountains, Va. and Nor at waistline with a toft fold end man Leonard Kerber of Washing tng in a boar in the back. Her NUMBER 49 ton. D. C. were m arriad Saturday, headdress was of matching peau- NINETY-FIRST YEAR CHATSWORTH, ILLINOIS, THURSDAY, AUGUST 5, 1956 July 31 at 7 pjn. at the First de-soie with a complexion veil. Brethren Church at Winchester, She carried a nosegay of match Va. The Rev. Paul EL Dick of ing carnations. Winchester officiated at the dou Mrs. Faye Cullen of Front Plans To Open Junior College Pontiac Band To ble ring ceremony before an altar Royal. Va. and Miss Ellen Croaon of snapdragons, mums, palms and of Arlington, Va. served as brides candelabra. maids and were dressed identical At Pontiac September, '66 Give Concert Mrs. Paul E Dick of Winches to the matron of honor. Efforts to establish a Junior col has said, “Many young people with ter was organist and acocmpauiied Michael Kerber of Chatsworth lege In Living*ton County are well potentiality need the personal Aug. 11th Mrs. Donna Powell of Waterlick, served his brother - as best man under way, according to informa guidance program which a private soloist. and Paul Villemaire and Debnus Junior College can offer.” Arthur O. Walter states that he tion presented a^ a meeting In has secured another fro* band Parents of the couple are Mr. Smith both of Washington, D. C. Pontiac Friday evening. -
ARCHERY 101 FUNDAMENTALS of ARCHERY During the Course the Instructor Will Review, Archery Safety, Shooting Form, and Types of Equipment
2012 ARCHERY 101 FUNDAMENTALS OF ARCHERY During the course the Instructor will review, archery safety, shooting form, and types of equipment. Archery 101 Page 1 Texas Archery Academy www.texasarcheryacademy.org Archery 101 Course Curriculum This Archery 101 course consists of four sessions, each being one hour. Archery 101 introduces archery safety, shooting form, archery styles, equipment and scoring rules. Each session offers “show and tell” discussion for fundamental archery education. The majority of each class is just a lot of FUN shooting, but with structured drills and practice, along with skills. Students learn a neutral style of archery that builds the basics of a solid shooting form. Easy to use equipment allows skill progress, without emphasis on strength or gender. The program curriculum uses the JOAD/AAA training and awards system, a nationally recognized archery program developed by USA Archery and the international FITA “Feathers and Arrows” archery education program. This combination is the first step in a “black belt” style, self-paced, achievement program in target archery. Regular group classes combine fundamental archery education curriculum and shooting skill development. Along the way to completion, the archer will achieve three award pin levels: Green, Purple and Gray. Each has a shooting proficiency test and education curriculum. Page 1 Texas Archery Academy www.texasarcheryacademy.org Archery 101 Introduction Welcome to Archery! Through the ages, this primitive weapon has fed families, conquered civilizations, and provided a wonderful source of recreation. As a martial art, archery helps build self-confidence and control. As a sport, it ranks with golf as a challenge to building individual skill. -
Archery What, Where
Archery 101 The What, Where, and How Anshul Joshi GradSAC What • ‘Arcus’ (Latin) = arch, bend • Toxophilite • Late Paleolithic (~10,000 BCE) The Bow Types • Recurve • Longbow • Compound The Bow Limb Belly (Compression) Back • Self bow (one piece wood) (Tension) • Composite (horn, wood, sinew) • Laminated (fiberglass, wood) Recurve/Longbow • ~Linear draw force curve • Harder to master Compound • “Bow on training wheels” • “Let off” (50%, 25% etc) • Sniper rifle of the bow world The Arrow Fletching Nock Fletching • Feathers • Vanes (Duravanes) • Blazer Vanes Shaft The Fletching Stays straight by drag Stays straight by spin The Shaft • Aluminum, Wood, Carbon • Archer’s Paradox • Decides the “flex” of the arrow • Tradeoff: Flex, Weight, Speed The Arrow tips • Blunts • Field points • Hunting tips/Razorblades/Broadheads Where • Outside city limits • Archery range (e.g.: Salt Lake Archery, near $ theatre) • Backyard (Illegal!) • Archery range: New/Rentals….EBay: Used • New: ~$200+ … Rental: ~$12/day How: Safety first! • A bow/arrow is powerful enough • Never load unless range is clear!!! • Never retrieve unless range is clear!!! • Never dry fire!!! • Listen to the range master!!! How: Draw How: Stance • Do not grip! • Wear gloves/finger tab • Feet, Shoulders, arms in one line facing target Aim Gap Shooting Sights Point of Aim +String Bow Specs AMO length: Length of unstrung bow Draw weight Draw length: (Usually 26-32”). Your draw length = your arm span in inches ÷ 2.5 *Always written as weight @ length (e.g.: 45# @ 28”) RH/LH: Right handed – Left handed (Eye dominance test) Bow Specs – RH/LH *IMP*: Eye dominance test 1) Aim using both eyes 2) W/o moving hands, see with left eye, then right eye 3) Dominant eye sees the target vs. -
Fmj™ and Carbon Arrow Selection Chart
FMJ™ AND CARBON ARROW SELECTION CHART COMPOUND BOW YOUR ARROW LENGTH BOW RATING RECURVE LONGBOW TO 301-340 FPS 23" 24" 25" 26" 27" 28" 29" 30" 31" 32" BOW POUNDAGE BOW POUNDAGE 22-26 700, 600 700, 600 600 600 600 500, 480, 460, 470 500, 480, 470, 460 38-43 27-31 700, 600 700, 600 600 600 600 500, 480, 460, 470 500, 480, 470, 460 400, 390 44-49 32-36 700, 600 700, 600 600 600 600 500, 480, 460, 470 500, 480, 470, 460 400, 390 400, 390 32-36 50-55 37-41 700, 600 700, 600 600 600 600 500, 480, 460, 470 500, 480, 470, 460 400, 390 400, 390 400, 390 37-41 56-61 42-46 700, 600 600 600 600 500, 480, 460, 470 500, 480, 470, 460 400, 390 400, 390 400, 390 340, 330, 320 42-46 62-67 47-51 600 600 600 500, 480, 460, 470 500, 480, 470, 460 400, 390 400, 390 400, 390 340, 330, 320 340, 330, 320, 300 47-51 68-73 52-56 600 600 500, 480, 460, 470 500, 480, 470, 460 400, 390 400, 390 400, 390 340, 330, 320 340, 330, 320, 300 330, 320, 300 52-56 74-79 57-61 600 500, 480, 460, 470 500, 480, 470, 460 400, 390 400, 390 400, 390 340, 330, 320 340, 330, 320, 300 330, 320, 300 300, 280, 260, 250, 240 57-61 80-85 62-66 500, 480, 460, 470 500, 480, 470, 460 400, 390 400, 390 400, 390 340, 330, 320 340, 330, 320, 300 330, 320, 300 300, 280, 260, 250, 240 260, 250, 240 62-66 67-72 500, 480, 470, 460 400, 390 400, 390 400, 390 340, 330, 320 340, 330, 320, 300 330, 320, 300 300, 280, 260, 250, 240 260, 250, 240 67-72 73-78 400, 390 400, 390 400, 390 340, 330, 320 340, 330, 320, 300 330, 320, 300 300, 280, 260, 250, 240 260, 250, 240 73-78 79-84 400, 390 400, 390 340, 330, 320 340, 330, 320, 300 330, 320, 300 300, 280, 260, 250, 240 260, 250, 240 Note: For fractional arrow lengths, round up or down to the closest column. -
CHOOSING ARROWS for YOUR NEW LONGBOW Joe Vardon
CHOOSING ARROWS FOR YOUR NEW LONGBOW Joe Vardon WHAT LONGBOW? I am confining the following remarks to “American flatbows”, (referred to in Australia as “longbows”). This is a composite timber/fibreglass bow whose limbs are wider than they are thick and which is widest at the riser. They have an arrow shelf cut into the riser which must not exceed 3/8” deep. This means that the arrow needs to curve around the riser on release and therefore the spine (stiffness) of the arrow is important in getting sufficient clearance and a good flight. ARROW MATERIALS Aluminium or wooden arrows are first choice for longbows. Carbon and carbon/aluminium are generally too stiff and are designed for bows cut to centre-shot or very close to it, as well as being rather expensive for the mortality rate of arrows shot from a longbow! Archery Australia rules currently allow aluminium arrows for all events (target, field, clout and indoor), however FITA or ABA (Australian Bowhunting Association) rules require wooden arrows. Wooden arrows need to match in weight and spine (stiffness) and, although you only need three arrows, keeping a matched set with some reliable spares can be difficult. Some purists insist on shooting wooden arrows from a longbow at all times. Good luck to them, I can see their point of view but I find life is a bit short. Aluminium arrows are branded with a 4-digit code and an alloy identification • Size: 4 digit code – the first two are the outside diameter (OD) in sixty-fourths of an inch. -
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?WMRK XLI /RKPMWL PSRKFS[ + VGLIVW HY 1IRIZSMW www.toxophilus.org Security when shooting a bow Archery is a potentially dangerous sport which must only be carried out in an appropriate place reserved for such activity with correct supervision. We decline all responsibility for damage and/or accidents which occur as a result of putting any of the activities described in this tutorial into practice. Shooting line When shooting in a group, it is important that all archers remain behind (or astride in the case of a competition) a visible (or imaginary) line while arrows are being shot. Crossing the line towards the targets during shooting is not only dangerous but is sanctioned by immediate disqualification during competitions. Spectators must, under no circumstances, be allowed to stand between the archer and the target even if they are outside the shooting angle. R etrieving arrows from the target The basic rule is to wait for the last archer to shoot his or her last arrow before advancing to collect one’s own arrows from the target. However, if the order “fast” is given, all archers must immediately stop shooting. The signal that indicates that all is clear to cross the shooting line is when a designated person shouts the order: “Arrows” (or a word such as “score” or “pull”). A rm ing a bow Never arm a bow or even place (nock) the arrow onto the bowstring if the bow is not pointed at the target. All archers must be aware that an arrow can be loosed accidentally before it is correctly aimed. -
Bow Construction Bow Construction
Bow Construction Bow Construction Understanding the terminology. Choosing Wood types,..............................................woods other than Yew and Osage orange, seasoning of the wood,..............................................tools preperation, ................................................................the ideal line of grain and wood growth rings, initial preperation of the back of the bow,.................Flatbow construction,...............Longbow construction, Tillering bows ................................... the initial process, ................................... precise tillering, fitting final nocks .........................................................optional extras. Recurving .....................................................................straightening. An easy method of rawhide bow backing Making your own Bowstrings and Arrows. Crossbow design 1. Crossbow design 2. .....................................................................Recommended reading..................................................................... Updates will be added as they become available, e.g., natural bowstrings, home made arrowheads, bow designs, crossbow designs and quills etc., file:///C|/DATA-HP3/XReWork_Post%20PS-S/WorkIt/Group_Defense/Bow-arrows/Bowmaking/bow%20construct.htm [11/2/2009 1:31:50 PM] Terminology Terminology Stave. Length of wood, radially split from log, branch or comercially purchased timber from which the bow is to be constructed. (Also refered to as bow-stave.) Tillering. The process of working -
AF Mar / Apr 01
ArcheryFocusArcheryFocusmagazine Volume 5, Number 2, 2001 $5.00 YouYou askedasked ASTE PM R forfor O it!it! The LoopMaster * O Made for loops, its L cocking mechanism doubles as a safety. It swivels 360˚ Full ReleaseView and rotates out of your way when not in use. What more ! S can you ask for? P O O *Patent Pending L 3 R 6 O ZLY L 0˚ F Z O S E I O WI AD R P VEL - M G The Grizzly Loop* Our E glove completely folds out of your H way! Squeeze into the rubber grip, T while pulling with a comfortable Front Foldaway strap. Also available in our stan- View dard caliper, single ball, or double *Patent Pending ball jaws, the Grizzly is the better glove that you’ve been asking for! ! e Back Foldaway Pro Jackie Caudle e View r *2000 Buckmasters Champion F *2000 ESPN® Outdoor s Games Winner nd w XT Ha Ne rem he e T Pro Shannon The New XTreme * Caudle This year we’ve added fin- *2000 IBO ger grooves and a knurled World *Patents Champion #5,937,842; trigger with a shorter exten- *2000 Cabela’‘ss #5,685,286; Shooter of #5,715,805; sion to the XTreme Series! #5,803,068. the Year Not only is it shorter than Pro George C the competition, it’s also ! Dixon o u made the way you want it! “Since using T.R.U. n o Ball, I have won to y $325,000 in cash and u it prizes, as well as four World, re f We two National, four Team d to make National, eight Shooter of the archery Year, and the 2000 Cabela’s WWW.TRUBALL.COM World Championships! PO Box 1180 Madison Heights, VA 24572 better!better! (804)929-2800 Jesus Christ is our Unlimited Resource! Contents Departments 10 ArcheryFitness Annette M.