Math Question for the Day

[muzzyslingr]

Here is one for you tech-no types. I have a recurve that is supposed to be 40lbs draw weight @62'. Putting it to the measureing tape, i come up with 61'tip to tip.I have a draw length of 29.5 inches.Brace hieght is 7.5 after i twisted the string a few times.Based on the figures i have given, what would be my peak draw weight when the bow is @ full draw? Would it still be 40 lbs or more? I also shoot Gold Tip 3555 shafts with 100gn field points and have been very pleased with them.  

[pumatrax]

must be 40 pounds at 28"....full draw I guess is 29.5" ..put it on a bow scale and pull it down to 29.5"   probably 44 pounds or so... I don't think anyone can give you an exact figure with the information you gave ; least I can't ; Doug

[wtpops]

44.5 lbs

[WildmanSC]

I would suspect the bow is rated at 40#@28" for a 62" bow.  Also, how did you measure 61" tip to tip.  Was the bow strung?  If so, did you measure straight across the string?  Or across the back of the limbs/riser?  Or across the belly of the limbs/riser?  It should have been across the back of the limbs/riser and nock to nock.

Bill

[muzzyslingr]

Yes the bow was strung when i measured it. I agree that putting on a scale would be the most definitive way to check . I was wondering if there was a formula that one could use to figure my question out.Some of you came up with 44.5 lbs. How do you figure this? I hope this is'nt anoying anyone .I am new to this and it has been a lot of fun .Yes it is supposed to be 40lbs @ 28". Thanks a lot for the replies y'all

[Orion]

Generally, bows stack, i.e., gain weight at 2-3# per inch of draw for every inch past 28 inches, until you reach 30 inches or more, when most stack 3-5# per inch for each additional inch.  Because your bow is relatively light to begin with, it probably gains about 2# per inch to about 30 inches.  Thus, probably draws in the neighborhood of 43#@28 inches.

[pumatrax]

As far as I know there is no formula...just a "general rule" ..how you could say exactly 44.5 pounds is (in my opinion) just an educated guess. I have 2 Pronghorns both 57# @ 28" but different woods in each; beyond 28" they begin to differ..both are 62" in length with the same brace height...one is amberboo limbs the other dymond wood...go figure

[Coop]

You can't really have a formula because bows are different. Different woods,, different thicknesses, different widths, different design...they are just different. Like mentioned most bows gain 2-3# per inch so if you are really drawing 29.5" I would guess you gained 3-4#.