weight vs speed

[compound_convert]

first of all i would like to thank eveyone who gave good advice on my last topic. here is another one though. im using 2117 aluminium arrows on a 55# @ 28 recurve, now my draw is 30 1/2. i have decided to use 100 grain bh. im thinking that i may get away with the lighter bh since the arrow its self is heavy, but the con. energy is behind the heavier heads. basically my question is for my draw and the arrow weight of a smaller bh be the same, since there is more speed, than if i were to use a heavier bh. all i want is deep penetration on the hunts. any and all advice will be appreciated.

[Spectre]

Wow, you are gonna be WAY overspined IMO. With 2117's, I am thinking more like 190 up front----depending upon your actual draw length, brace height, etc.

[Spectre]

http://heilakka.com/stumiller/

[compound_convert]

draw is 30 1/2'' brace height is @ 7 1/2. over spined im new to this, not really understanding. so increase the weight then on heads n points. these were recommended to me the 2117 that is. the entire arrow is hitting strait with out kicking to any direction at 20 yards. any info more info will highly appreciated.

[Spectre]

How long are those arrows? Is your recurve cut to center? What string are you shooting? What is your feather length?

[Looper]

He won't be overspined according to Stu's calculator. In fact 31" 2117s with a 100 point will be a touch weak for a 55@28 drawn to 30.5, depending on how far from center his riser is cut.  I've got longbows around the same weight and I draw them to a touch longer. 2117s are way too weak for me, even with 100 grain points.

[m midd]

I dont think you will see a difference with a 100 or 125 head. My 2117 full lenth weigh about 578gr.. with a 125gr head. If you have good arrow flight I dont see any reason to change anything. Arrow weight is arrow weight no matter how heavy the head is. BUT a arrow with greater FOC does shoot better.

[m midd]

My 2117s are a touch stiff for my 63@28 GN.. I draw 28"

[compound_convert]

another question being over spined can effect the arrow n its flight im guessing. what can happen being that i am over spined. im just trying to get all the info needed to have my bow n the arrows working as a solid unit.

[Spectre]

Learn something new each day.

[Looper]

Btw, those arrows are going to be really light for you as well. It'll only weigh around 500 grains, which is around 8 grains per pound.  Your bow will be a lot quieter if you go with a heavier arrow.

You'd be better off going with some 2219s and a 145 grain head, which would weigh around 600. You could even go with some 2317s and a 190 grain head for a 635 grain arrow.

[Looper]

Originally posted by m midd:
My 2117s are a touch stiff for my 63@28 GN.. I draw 28"

There's a big difference between 63@28 and [email protected].

[compound_convert]

arrows are 32'' i think or 31 1/2 they were never cut. 5 '' shield feathers which i want to go to the 4''

[Spectre]

According to Stu, your bow needs 67.6# and your arrows are 65.4#. Pretty close. I am assuming a center cut bow with 1/16" of strike plate and a B50 string.
 Pretty close.

[Looper]

Originally posted by compound_convert:
another question being over spined can effect the arrow n its flight im guessing. what can happen being that i am over spined. im just trying to get all the info needed to have my bow n the arrows working as a solid unit.

They won't be overspined (too stiff), they'll be underspined (too weak).

To answer your question, overspined or underspined, you won't get good arrow flight.  Too stiff, and they'll hit to the left (assuming you're right-handed). Put a broadhead on them and they'll go further left.

In order to get you to a close starting point, you'll need a few measurements.

First get someone to help you measure an accurate draw length.

Second, you'll need to know what your bow actually pulls. Sometimes a bow can be mismarked high or low.

Third, you'll need to measure your center cut, or how far from the centerline of the bow your arrow rest is.

Lastly, you'll need to know what type of string your using.  Fastflight or b50. And how many strands.

With that information you can get a good starting point using Stu Miller's calculator. I've found it to get me pretty close with a variety of bows and shaft types. You might need a variety of point weights to find the right one for you.

I'd recommend not cutting your arrows until you're absolutely sure of what your actual draw length is. Often times new trad shooters will gain draw length when or if they need to change their shooting form.

[Looper]

Originally posted by Spectre:
According to Stu, your bow needs 67.6# and your arrows are 65.4#. Pretty close. I am assuming a center cut bow with 1/16" of strike plate and a B50 string.
 Pretty close.

That's what I get, too.

Compound Convert, an uncut 2117 is 33", without the nock. That makes them definitely too weak for you. You could cut them to 32" (measured from the throat of the nock), and they'll work with your 100 grain heads. You'll still have an inch to play with if you need to make them stiffer. I don't think you've got enough spine to go heavier in head weight, though.

[Spectre]

Now, 2219's and 145's........nice setup.

[Looper]

Yeah, that's what I'd use. Actually, I did use 2219s and 145s for years. I just bent too many of them.

[Looper]

You know, we never did answer one of his original questions.

Regarding penetration, a 522 grain arrow going over 190 feet per second, will kill just anything you want to shoot in the US. In fact, I think it would shoot through anything you shoot at. However, if your going to be hunting any big boned critters, it might be a good idea to go with an arrow weight of around 10 grains per pound (635 grains in your case). For one thing, it will make your bow a lot quieter. You've got more than enough weight to still sling one 180 fps. With the heavier weight you'll get a lot more momentum, which is a better indicator of performance than kinetic energy.

Trajectory wise, even with a heavy arrow, you'll be plenty flat at hunting distances.

[compound_convert]

thanks every1, i going to the 2219's and 150 field points. 2117 r kind of weak since they are bending on me little by little when the arrow is hitting semi hard dirt. now i would take it that my point of aim (poa.), n the point of impact will be off. guess what im asking is i will have my bow shooting a little off, n will have to readjust then?