An offer to help

[Todd_ID]

Could you give me some advice for my wifes bow.  Here's her setup.  I'm wondering what would be better.  If she had an 85grain head and a 100grain head.  Again I'm more concerned with KE, proper spine and FOC than with speed.  Thanks again.

2009 Hoyt Kobalt
IBO:  290FPS @60lb
27" Draw Length
45lb Draw
Easton Epic Black 500's (7.3gpi)
Cut 26.5"
2" blazers
3 fletchings
100grain or 85grain broad head.
3 bladed broad head
Peep sight (without bungee chord)
D-Loop
Whisker Bisquit Rest.

Again thank you so much for you time and efforts Todd.  I'll be in the south so I can't offer you any good hunts other than hogs.  But you're welcome anytime.

No problem.. The numbers for 85 grain heads: recommended spine is .751, so the 500's are stiff, but probaby still fly fine, 195 fps, 320 grain arrow, 13.5% FOC, 27.2 ft-lbs KE, arrow drop 20-50: 67", KE @ 50: 23.3 ft-lbs.

The numbers for the same setup with 100 grain heads: recommended spine .720, 192 fps, 335 grain arrow, 15.1% FOC, 27.6 ft-lbs, arrow drop 20-50: 69", KE @ 50: 23.6 ft-lbs.

Get her up to 50# draw weight through the summer practice, and you'll be increasing the KE by 10% to 201 fps, and 30.2 ft-lbs KE with the 100 grain heads and the 85 grain heads will be 204 fps, 29.7 ft-lbs KE.

Momentum is more important than KE for potential penetration, at 45# and 85 grain heads the initial momentum is .2784, and the momentum at 30 is .2657.  At 45# and 100 grain heads, initial is .2869, and at 30 yards is .2738.

Basically the decision comes down to a 3% gain in momentum at 30 yards between the two heads.  My take is that either head is acceptable, and that shot placement is going to be critical with either head.  My uncle has killed dozens of elk with a 40# bow that has less energy than your wife's bow has, so don't let anyone tell you it won't work; the caveat is that it has to be a good shot, away from the shoulder; it'll break elk ribs, but not the shoulder by any means.
 

[colockumelk]

In regards to all of the above would you recommend her shooting Easton's Flatlines that are only 6.5gpi?  I havn't bought any arrows yet so I just want to figure out what would be the best thing to start off with.  Thanks again.

Oh I also made a mistake.  The IBO is 310 fps.  Sorry

[Todd_ID]

In regards to all of the above would you recommend her shooting Easton's Flatlines that are only 6.5gpi?  I havn't bought any arrows yet so I just want to figure out what would be the best thing to start off with.  Thanks again.

Oh I also made a mistake.  The IBO is 310 fps.  Sorry

I'd stick with what you've got on the Epics.  Heavier is better every time.  The extra spine from the arrows being too stiff will most likely be whittled away as she shoots more and more and the draw weight gets turned up.

[D-Rock425]

I'm thinking about buying the hoyt aphaburner but i was wanted to know if you could run some numbers on two different arrows first. 340 IBO i think
27 inch draw
64pounds
D-loop
QAD ultra rest
first arrow gold tip pro 5575 28 inches long.
fletched with three 2 inch blazers
85 grain field tip.
the second arrow is a 400 easton light speed 3D (i think 7.4 GPI)
28 1/2 long
2 inch blazers
g-nocks
85 grain glue in tips

[Todd_ID]

I'm thinking about buying the hoyt aphaburner but i was wanted to know if you could run some numbers on two different arrows first. 340 IBO i think
27 inch draw
64pounds
D-loop
QAD ultra rest
first arrow gold tip pro 5575 28 inches long.
fletched with three 2 inch blazers
85 grain field tip.
the second arrow is a 400 easton light speed 3D (i think 7.4 GPI)
28 1/2 long
2 inch blazers
g-nocks
85 grain glue in tips

Gold Tip: recommended spine .350, so the .400 spine 5575 are pretty weak.  292 fps, 355 grain arrow, 11.5% FOC, 67.4 ft-lbs KE, 20-50 drop: 26.7", KE @ 50: 57.2 ft-lbs.

Easton: rec spine: .352, so 400's are still weak.  299 fps, 323 grain arrow, 9.4% FOC, 64 ft-lbs KE, 25.2" drop, 54.6 ft-lbs KE @ 50.  Cut these to 26" and you get 303 fps, 9.8% FOC, 304 grain arrow, 24.3" drop with recommended spine of .384, so it'd be more in the ballpark.

[PacificNWhunter]

27.5 inch draw
63 lbs draw weight
D-loop
Mathews fallaway rest
400 Easton ST  Axis 28" arrows
3, 2" blazer veins
peep site
100 grn field tips

forgot to ad, IBO of 342

[Todd_ID]

27.5 inch draw
63 lbs draw weight
D-loop
Mathews fallaway rest
400 Easton ST  Axis 28" arrows
3, 2" blazer veins
peep site
100 grn field tips

forgot to ad, IBO of 342

Didn't see the type of bow that you're thinking about, so I used the 2010 Mathews Monster 7, because it has the same IBO rating.  Recommended spine for that arrow is .362, so the 400's are a little weak, and I think broadheads would fly much more reliably with the 340's, but that's up to you.  Looks like the 400's would be 289 fps, 392 grain arrow, 12.6% FOC, 73 ft-lbs KE, 20-50 drop: 27.2", KE @ 50: 62.6 ft-lbs.  The 340's would be 287 fps, 406 grain arrow, 12.2% FOC, 74.2 ft-lbs KE, 27.8" drop, KE @ 50: 63.5 ft-lbs.

[D-Rock425]

I'm thinking about buying the hoyt aphaburner but i was wanted to know if you could run some numbers on two different arrows first. 340 IBO i think
27 inch draw
64pounds
D-loop
QAD ultra rest
first arrow gold tip pro 5575 28 inches long.
fletched with three 2 inch blazers
85 grain field tip.
the second arrow is a 400 easton light speed 3D (i think 7.4 GPI)
28 1/2 long
2 inch blazers
g-nocks
85 grain glue in tips

Gold Tip: recommended spine .350, so the .400 spine 5575 are pretty weak.  292 fps, 355 grain arrow, 11.5% FOC, 67.4 ft-lbs KE, 20-50 drop: 26.7", KE @ 50: 57.2 ft-lbs.

Easton: rec spine: .352, so 400's are still weak.  299 fps, 323 grain arrow, 9.4% FOC, 64 ft-lbs KE, 25.2" drop, 54.6 ft-lbs KE @ 50.  Cut these to 26" and you get 303 fps, 9.8% FOC, 304 grain arrow, 24.3" drop with recommended spine of .384, so it'd be more in the ballpark.

Thanks todd

[PacificNWhunter]

Thanks, yes I have a monster 7. Just got it yesterday, those were the arrows they gave me. I will look into some 340's when I can scrape up some more cash.

[colockumelk]

Todd Sorry to bother you again but......

I have one question for my wifes bow. (I gave you the wrong stats last time sorry)  Ive narrowed it down to three different arrow shafts.  Could you please recommend to me which arrow setup would be better.  I'm just currious about what the FPS, KE, FOC and drop would be for the following set up.  The three arrow choices would be Axis 500 Camo (8.9gpi)  The Axis 500 Black (8.1gpi) or the Epic 500 Black (7.3gpi)
I tried to find a 600 spine arrow but that doesn't seem to be too common of an arrow spine.  So even though the 500 spine would be too stiff would it be okay?  Thanks again. 

Hoyt Kobalt
330fps IBO
27" draw length
50#pull weight
Arrow Length 27"  Either (8.9gpi, 8.1gpi or 7.3 gpi)
100 grain G5 Stryker 3 blade.
Whisker Bisquit Rest
Peep sight
D-Loop

[Todd_ID]

I'm just currious about what the FPS, KE, FOC and drop would be for the following set up.  The three arrow choices would be Axis 500 Camo (8.9gpi)  The Axis 500 Black (8.1gpi) or the Epic 500 Black (7.3gpi)
I tried to find a 600 spine arrow but that doesn't seem to be too common of an arrow spine.  So even though the 500 spine would be too stiff would it be okay?  Thanks again. 

Axis Camo 500: 192 fps, 380 grain arrow, 13.2% FOC, 31.2 ft-lbs, 20-40 drop: 34.8"
Axis black 500: 197 fps, 358 gr, 13.9%, 30.8 ft-lbs, 34" drop
Epic 500 black: 201 fps, 339 gr, 14.9%, 30.3 ft-lbs, 32.5" drop.

Too stiff is way better than a little weak.  Practice is going to be much more important than perfect equipment choices.

[colockumelk]

Hey Todd hows it going?  Could you let me know the performance I can expect from my bowset up and my wifes bow set up.  Such as the arrow speed, KE and arrow drop from 20yds out to 50yds.  My bow is shooting a 455g arrow at 262 FPS.  My wifes bow is shooting a 353g arrow at 229 FPS.  Thanks.  BTW thank you for the advice.  Heavier is awsome.  I have never shot so accurate.  Love it or had so much trouble pulling arrows out of a target.  (Awsome penetration)  Thanks.

[MasterMisser]

Hey Todd could you please run my numbers...
Im shooting a 2010 Hoyt Maxxis. 80-70# draw. the bow maxed out is actually 84lbs. So 84# draw weight. 29" draw and Beman hunter elites cut at 27" with 3 AAE Max Hunter Fletchings, 100 grn field point, and Easton G-Nocks with UNI bushings. I think thats all you need... It chronos at 321.5 fps and if my math is right its Kenitic Energy is 86.77ft lbs with a total arrow weight of 378 grains.... O and my arrows are a 400 spine 8.4grains per inch....
whats your program show??

[Todd_ID]

Hey Todd hows it going?  Could you let me know the performance I can expect from my bowset up and my wifes bow set up.  Such as the arrow speed, KE and arrow drop from 20yds out to 50yds.  My bow is shooting a 455g arrow at 262 FPS.  My wifes bow is shooting a 353g arrow at 229 FPS.  Thanks.  BTW thank you for the advice.  Heavier is awsome.  I have never shot so accurate.  Love it or had so much trouble pulling arrows out of a target.  (Awsome penetration)  Thanks.

Need more info here.  Point weights, fletch type, etc. all have an effect on the flight.  Basically list out everything again, and I can make it happen, but there are too many variables to make guesses and end up anywhere near accurate results.

[Todd_ID]

Hey Todd could you please run my numbers...
Im shooting a 2010 Hoyt Maxxis. 80-70# draw. the bow maxed out is actually 84lbs. So 84# draw weight. 29" draw and Beman hunter elites cut at 27" with 3 AAE Max Hunter Fletchings, 100 grn field point, and Easton G-Nocks with UNI bushings. I think thats all you need... It chronos at 321.5 fps and if my math is right its Kenitic Energy is 86.77ft lbs with a total arrow weight of 378 grains.... O and my arrows are a 400 spine 8.4grains per inch....
whats your program show??

Ok...looks like your setup should be somewhere near: 12.5% FOC, 20-50 drop: 21.1", KE @ 50: 73.4 at 296 fps.  Recommended spine is .300 even, so you are way underspined with the 400's; better make damn sure to test every arrow before every shot and only use them with field points: that's the type of underspining that gets your picture on the internet with 10,000 pieces of carbon in your hand.  I'm not saying that they can't work, but I personally wouldn't shoot your setup without a stiffer arrow.  You'll most likely not have too good of luck getting a broadhead to fly without getting much closer to the proper spine.