Arrow Spine

From: Subject: Arrow Spine Date: Wed, 21 Jun 2006 22:36:45 +0200 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0065_01C69583.2D34FEA0" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 This is a multi-part message in MIME format. ------=_NextPart_000_0065_01C69583.2D34FEA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://domino.htcomp.net/bhn/columnists.nsf/d731dec9a617821886256590000646df/ca196c7c196f33ef862565a20066391f?OpenDocument Arrow Spine

Traditional=20 Archery
By Doug = Besherse=20

Picking The Correct Arrow Spine For Longbows &=20 Recurves

One of the most common asked questions I = receive is "what=20 spined arrow should I shoot out of my bow.? This is a very = important=20 question because to achieve good arrow flight having the correct = spine is=20 a necessity Picking the correct spine can be confusing and down = right=20 frustrating at times, but once you understand the variables = involved it is=20 much easier. In the following article I will focus on those = variables and=20 how they affect the spine of the arrow. After reading this article = you=20 should be able to pick a spine range that will be a good starting = point in=20 your quest for proper arrow flight. A statement that I have made = before=20 and will probably make again is "I have never helped someone = correct=20 arrow flight problems by going up in spine weight." This = statement has=20 more bearing when it comes to tuning the arrow to the bow, which = is=20 something that I will discuss in a following article, but it is = something=20 that should be brought up now in the early stages of picking a = spine. The=20 problem I see most people make is they start with a spine that is = border=20 line to stiff. When they can't get the arrow to fly correctly they = automatically think the spine is to weak and therefore proceed to = make the=20 problem worse by going up in spine. When picking a spine you = should=20 consider that most of the shots you will take while hunting are = not going=20 to be in the best of situations. Things such as cold mornings, = extra=20 clothes and awkward positions will not allow you to draw the bow = as far as=20 you normally would under more perfect conditions. When you don't = draw the=20 bow back as far it does a couple of things that in effect make the = arrow=20 to stiff. The conditions that are faced while hunting have always = made me=20 advise a person to go a little light when picking spine. There are = many=20 variables that affect arrow spine. I will list the most common = variables=20 and tell how they affect the spine. Keep in mind that some of = these=20 variables do not drastically effect the spine but when several of = those=20 variables are added together it can drastically effect the spine. = Fast=20 Flight Strings affect spine probably more than any one factor. = Fast=20 Flight may only add 5 or 6 feet per second in the speed when = compared to a=20 Dacron string however it's effect on spine are enormous. Fast = Flight has=20 virtually no give and literally "hammers" the arrow, conversely = Dacron has=20 give and acts as somewhat of a shock absorber on the arrow. As a = general=20 rule if you use Fast Flight you will have to increase your spine = weight by=20 15# with wooden arrows or go up two shaft sizes on aluminum = arrows.=20 Weight Of Broadhead: This is not near as big a factor as = what most=20 people would make it out to be but it can make the difference = between an=20 arrow flying good or not flying good. When trying to pick a spine = weight=20 consider that if you use a heavier broadhead it will in effect = weaken the=20 arrow and therefore you will need to increase your spine. If you = use a=20 lighter broadhead you will in effect stiffen the arrow and = therefore need=20 to decrease your spine. How much should you increase or = decrease?=20 Well that is more or less an educated guess. Over the years this = is what I=20 have found, the vast majority of people prefer a 125gr broadhead = and when=20 I recommend a spine that is what I have in mind. If you have the = perfect=20 spine for your bow you can probably shoot a 110gr to a 140gr = broadhead and=20 get acceptable results. If you go down to a 100gr or up to a 150gr = I would=20 suggest adjusting your spine weight by #5 on wood or by 1 size on=20 aluminum. If you are going to use a 190gr broadhead you will = probably need=20 to go up in spine weight another #5 on wood or go up another size = on=20 aluminum. You will have to adjust the above suggestions if you are = shooting an arrow that is borderline too stiff or too weak. = Draw Length=20 also comes into play when selecting spine. Keep in mind that = draw=20 length and arrow length are two separate things. Most all bows are = marked=20 a certain poundage at 28" (50#@28"). When selecting spine you need = to know=20 your exact draw length and the poundage you are pulling at your = draw=20 length. The best way I have found to determine exact draw length = is to=20 actually shoot the bow you are getting arrows for. Loosen up by = shooting a=20 few times then have a friend grab the arrow at the back of the bow = while=20 you are at full draw, then ease down on the string and let your = friend=20 take the arrow off the bow. Now measure the arrow from the nock to = the=20 spot on the arrow that he is holding. The most effective way to do = this is=20 to let the friend grab the arrow without you knowing when he is = going to=20 grab it. Most of the time when a guy gets his draw length checked = he will=20 overdraw the bow as to make sure his arrows are long enough, this = only=20 gives you a false draw length. When a person grabs the arrow when = you are=20 not expecting it the results will be more accurate. For most = people the=20 above exercise is an eye opening experience. I have found that = most guys=20 overestimate their draw length which can really mess things up. If = you do=20 this your draw weight calculation will be more than it should be = and you=20 will have to add spine for the extra length. What you will end up = with=20 will be a grossly overspined arrow. When I deal with someone on = the phone=20 I have a test I give them to find out if they are giving me their = correct=20 draw length. To do this I ask them in a very casual way how tall = they are=20 and if they wear a "regular" or "long" in a jacket. I am positive = some=20 people have scratched their head upon hearing these questions but = the test=20 has never failed me. Here is how it works. It is no coincidence = that a=20 bows weight is marked at 28", the vast majority of guys out there = have a=20 draw length within 1/2" of this. In fact most guys have this draw = length.=20 The reason for all this is that the average Joe is 5"10' tall. If = you are=20 5"10' and you wear a "regular" jacket you have a draw length of = 28"=20 whether you believe it or not. I have proved this to so many = people I am=20 extremely confident that you are no exception. If you do not have = that=20 long of a draw you are probably short drawing the bow by not = spreading=20 your shoulders. If this is so you need to work to correct that = because you=20 are losing alot of performance by short drawing a bow when you = don't have=20 to. To take this test a step farther to adjust for every 1" in = height add=20 or subtract 1/2" in draw length. If you are 5"8' your draw length = should=20 be very close to 27". If you are 6" tall your draw length should = be close=20 to 29". Give this formula a try you'll be amazed at how accurate = it is.=20 Draw Weight: Once you have determined your exact draw = length you=20 can now discover what your draw weight is at that length. The best = way to=20 do this is to put the bow on a bow scale and draw it to that = length. Make=20 sure you measure it to the back of the riser because this is the = way you=20 checked the draw length.A bow scale is the best way to check the = poundage=20 because sometimes, and I stress sometimes, the bow is marked wrong = and the=20 bow weight is something other than what you think it is. If you do = not=20 have access to a bow scale you can take for granted the bow is = marked=20 correctly and use this formula. For every inch of draw above or = below 28"=20 add or subtract 5% of the draw weight. An example is 50# x 5% =3D = 2.5# per=20 inch, if you drew this bow 30" the draw weight at your draw length = would=20 be 55#. On the other side if you only drew the bow 26" the draw = weight=20 would be 45# at your draw length. Arrow Length: When you = lengthen=20 the arrow it weakens the spine, when you shorten the arrow it = stiffens the=20 spine. This is very simple to understand, like taking a stick and = breaking=20 it in two then taking one of the two pieces and trying to then = break it.=20 The short piece is very hard to break because it is stiffer. = How much=20 will length affect spine? Again this is a guessing game but = this is=20 what I have found. The average guy shoots a 281/2" arrow, for = every 2"=20 over that you will need to increase the spine weight by 5# in wood = or by 1=20 size in aluminum. For every 2" under that you will need to = decrease that=20 same amount. Off Set In The Riser is another big factor in = determining=20 correct spine. You can shoot a stiffer arrow out of a more = center shot=20 bow and you have to shoot a weaker arrow out of a bow with more = off set.=20 This in fact is the reason you can shoot a stiffer arrow from the = average=20 recurve than you can from the average longbow of the same draw = weight.=20 How much does it affect the spine? You know the answer, = it's an=20 educated guess. All bows are different and the amount of off set = varies=20 but here is the general rule. For longbows shoot one step weaker = in spine=20 than the average center shot recurve. There is a difference = between a=20 center shot and a past center or true center shot. The true center = shot is=20 cut 1/2 the diameter of the arrow shaft past the center line of = the bow=20 rather than just too the center line of the bow. On a bow cut past = center=20 go up one step in spine compared to an average center shot = recurve.=20

Bow Quivers are probably the most overlooked variable when = it comes=20 to picking spine. They do however have the affect of = stiffening the=20 spine. The ones that bolt to the riser section are not as = noticeable as=20 the ones that slide on the limbs but you should take them into=20 consideration. When you are going to use a quiver that slides on = the limbs=20 of the bow you definitely need to go down one step in spine. = The Way=20 You Shoot A Bow has an affect on the spine. If you pause = before you=20 release or for whatever reason let the limbs ease forward just = before you=20 shoot you will hurt the performance of the bow. If this is the way = you are=20 comfortable shooting by all means do it, but keep in mind this has = the=20 effect of stiffening the arrow. Of course the amount it stiffens = the arrow=20 is relative to the amount in which you do these two things. At any = rate it=20 is something to keep in mind and it is not out of the question to = have to=20 drop down a size in spine if you do these things. Feather Size = has an=20 effect on arrow spine also. Bigger feathers have the effect of = stiffening the shaft. You have heard that if you shoot a big heavy = broadhead you need to shoot a big feather to stabilize it. Most = people=20 don't realize that the reason it stabilizes the arrow is because = of the=20 stiffening effect it has rather than the ability the bigger = feather has to=20 stabilize the arrow thru rotation. This may be a little hard to = comprehend=20 but I have come to this conclusion thru much experience and = evaluation. I=20 have no set rule for this variable I only figure it into the mix = when I am=20 trying to pick a spine. Crown Dipping has a stiffening effect = on arrows=20 also. The reason is that you are adding weight to the back = half of the=20 arrow. This is another "figure it into the mix" variable. = String=20 Silencers add weight to the string and slow it down. This has = a=20 stiffening effect on the arrow as well. Some of the more noisier = bows need=20 a couple of sets of silencers to quieten them down. Some of the = material=20 that string silencers are made from is heavier than others also. = While we=20 are on the subject of making the string heavier, if you are using = more=20 strands in your bowstring than usual (having an 18 strand string = when you=20 could be using a 14 strand)you will also slow down the bow a = little. Take=20 these variables and figure it into the mix. With all the = variables that make=20 a arrow stiffer as opposed to those that make it weaker is it any = wonder=20 why so many people come to me with an overspined = setup.=20 I believe now you are starting to understand why I feel it is = better to=20 underspine a little when picking a spine. After reading all the = things I=20 have just said you are probably thinking "I need to be shooting a = 30/35#=20 arrow out of my 55# bow." Don't panic it isn't as bad as it = sounds. I only=20 listed all the variables to show how many things can and do affect = arrow=20 spine. Alot of the variables are figured in already when you are = picking a=20 spine as you are about to see. The spine recommendations that I'm = about to=20 make take into account that you are going to have an average set = up.=20 What is an average set up? The arrow is 28 1/2" long (or = within=20 1/4" of that) it has 5" feathers and a 125gr point. The bow has a = dacron=20 string with one set of silencers on it and no bow quiver. With = that in=20 mind use the above information to adjust for your particular set = up.=20 Remember the poundage of the bow needs to be taken at your draw = length so=20 on this set up the poundages listed are at 28?. The wooden = recommendations=20 are for cedar arrows(all wood does not shoot the same,I discuss = that some=20 other time). I personally do not like shooting aluminum arrows off = of=20 dacron stringed longbows because you have to shoot such a weak = spine to=20 get them to fly good. The weaker spined aluminum shafts do not = have a lot=20 of mass weight and therefore the bows will generally have = excessive=20 handshock. If the longbow has fast flight the spine weights you = shoot will=20 have more mass weight and will help absorb the handshock. The = spines=20 listed below for a longbow are for dacron strings remember to = adjust for=20 the fast flight.=20

Poundage
@=20 28" Recurve
Wood Recurve
Aluminum Longbow
Wood Longbow
Aluminum

40 35/40 40/45 1813, 1816,1913 35/40 1716, 1813

45 40/45 45/50 1816, 1913,1916 = 40/45 1813, 1816 =

50 45/50 50/55 1913, 1916, = 2013 45/50 1816, 1916 =

55 50/55 55/60 2013, 2016, = 2018 50/55 1916, 2013

60 55/60 60/65 2016, 2018,2117 55/60 2013, 2016 =

65 60/65 65/70
2215,2117,2216

60/65

2016,2018
I'm = sure=20 you noticed that the recurve has more options, that is because of = the=20 center shot riser. The longbow is not that hard to tune but it = does have=20 tighter tolerances. The suggestions I have made above are that,=20 suggestions. They have worked well for me and my customers in the = past=20 though and I hope they help you as well.=20

=20

If you have comments or questions you can reach me at mail@BowHuntingStuff.com=20

Return to Back=20 To Doug Besherse's Column Listings Page

Email Doug Besherse = at: mail@BowHuntingStuff.com =
To Doug = Besherse's=20 Home Page | To = bowhunting.net's Traditinal Archery forum
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