Arrow penetration technical info

[bowhuntntxn]

The only question I have, and the only one that makes all the math invalid IMO, is how is FPS at various distances acquired?

Who cares how much punch you have when the arrow starts, when we all know the penetration and everything else only matters she the arrow makes impact. And there are so many unobtainable variables at that point, it renders all other formulas moot.


Bone density of shoulder blade vs. rib bone or leg bone. Angle of impact at 17 yards vs. 32 yards which changes the blade angle upon entry which could affect mechanical advantage.

Things like that, in real world applications make all the book math somewhat just a bunch of confusing numbers that have no real meaning. Heavy is better for a whole lot of reasons, but fast and light have their advantages also.

And all this is predicated on the assumption that the bow is perfectly tuned where the maximum amount of energy is transferred from the string to the arrow.

Far too many unknown variables for any of the math to work.

[enewman]

I tend to listen to your advice as you have harvested some big critters.



I have a 974 grn arrow waiting for a buff that I hope to take in the next coming days. Leaving Sunday for my safari hopefully I find a buffalo that I want.

This would be great info. Can you give all spec on the 974 gn arrow.

Then lots of pics

I just saw where a guy took a Cape buffalo with a 850 gn arrow. Complete passthru.

[enewman]

The only question I have, and the only one that makes all the math invalid IMO, is how is FPS at various distances acquired?

Who cares how much punch you have when the arrow starts, when we all know the penetration and everything else only matters she the arrow makes impact. And there are so many unobtainable variables at that point, it renders all other formulas moot.


Bone density of shoulder blade vs. rib bone or leg bone. Angle of impact at 17 yards vs. 32 yards which changes the blade angle upon entry which could affect mechanical advantage.

Things like that, in real world applications make all the book math somewhat just a bunch of confusing numbers that have no real meaning. Heavy is better for a whole lot of reasons, but fast and light have their advantages also.

And all this is predicated on the assumption that the bow is perfectly tuned where the maximum amount of energy is transferred from the string to the arrow.

Far too many unknown variables for any of the math to work.

You shoot your arrow through a chrono at different distances.

Remember I posted above this is just info. And we always have variables.

And the only advantage a light fast arrow has is trajectory on unknown distance

Remember for years people based penetration off of K.e. And still do. More are looking at momentum. now we can look at APF. Just one step closer. That's it.

[bphillips]

Yes this is still some of the things that we have to look at. i don't think we will ever have a set number for taking animals. To many variables. I would also think when some of the numbers rob was looking at was worse case

We all have taken animals with light fast arrows with crappy ma broadheads.
It's all shot placement. But I'm sure most have lost an animal with that same arrow. We see it all the time. Very little penetration. I just prefer to build my arrows to get the most I can get.

Lots of this means nothing to them 70 lb 28 inch and up shooters

But for low draw or short draw like me it's a good way to look at penetration factore when building arrows

True. When I say I don't worry I should mention I'm a 70 or 65 and 29.5 guy so thats a lot of it.

I tend to listen to your advice as you have harvested some big critters.



I have a 974 grn arrow waiting for a buff that I hope to take in the next coming days. Leaving Sunday for my safari hopefully I find a buffalo that I want.

Man I'm jealous. I still haven't decided if I'll bow hunt when it comes time for Cape Buff. Ive always had my heart set on using an old school double rifle with iron sights

[Jon-Paul]

This would be great info. Can you give all spec on the 974 gn arrow.

Then lots of pics

I just saw where a guy took a Cape buffalo with a 850 gn arrow. Complete passthru.

Not real sure of all the specs as I am borrowing this from someone. This setup has been through 2 cape's and one just so happen to fall from our very own Landrover.

GrizzlyStik UFOC 175 shafts 774 grns, tipped with a 200 grn Single Bevel Maasai broached. I want to say the FOC is over 20. I have a 70# 28" halon 6 and it shoots this arrow 180fps.

[bowhuntntxn]

You shoot your arrow through a chrono at different distances.

Remeber I posted above this is just info. And we always have variables.

None of your information indicated and speeds other than max. Can you show an example of your arrow at 22 yards and 41 yards?

[Mudslinger]

I will post up my Cape Buffalo arrow sometime in the next few days and see what everyone thinks, but right now I have to get everything ready to drive to Lufkin tomorrow afternoon and meet with another TBH'er to buy and pick up an RV on Saturday for my deer lease. Long drive there and long drive back, but the best deal I could find over the last week.

My arrow is already made and has been shot and seems to be right on, but need to shoot them out of my new bow and set up and see what they do!

[enewman]

None of your information indicated and speeds other than max. Can you show an example of your arrow at 22 yards and 41 yards?

I could have. But I shot my chrono the other day. Got a new one coming

[bowhuntntxn]

I could have. But I shot my chrono the other day. Got a new one coming

Oh man. I have never shot a chrono, but I have shot other things around the chrono!!

[enewman]

Oh man. I have never shot a chrono, but I have shot other things around the chrono!!

Yea it was not good

[tex4k]

I think it matters to someone if they are planning to shoot something stupid big.
For deer and pigs it is just how deep into the ground do you want your arrow to go after it passes thru the deer

A www c'mon now, it's not going to be long before we're gonna be reading post about somebody sticking a big boar and wondering why their arrow bounced out. It don't always have to be stupid big, that and i like to antagonize ever once in awhile.

[Hholland]

The only question I have, and the only one that makes all the math invalid IMO, is how is FPS at various distances acquired?

Who cares how much punch you have when the arrow starts, when we all know the penetration and everything else only matters she the arrow makes impact. And there are so many unobtainable variables at that point, it renders all other formulas moot.


Bone density of shoulder blade vs. rib bone or leg bone. Angle of impact at 17 yards vs. 32 yards which changes the blade angle upon entry which could affect mechanical advantage.

Things like that, in real world applications make all the book math somewhat just a bunch of confusing numbers that have no real meaning. Heavy is better for a whole lot of reasons, but fast and light have their advantages also.

And all this is predicated on the assumption that the bow is perfectly tuned where the maximum amount of energy is transferred from the string to the arrow.

Far too many unknown variables for any of the math to work.

I agree with you to a certain extent. There are numerous uncontrollable variables in bow hunting and things that these formulas can not compensate for. Also we have all killed deer with 400 gn 300 fps arrows, but watch some hunting programs on tv and see how many do not get pass through shots. I will add that a pass through is not required but two holes r better than one for a blood trail.

You have to remember that most of this info is for those us that like knowledge, like tinkering and that hunt big hogs. None of this is necessary for white tails but a 200 plus pound hog, majority of the time a light arrow will not pass through, so, what this gives us is a way to calculate a flat line method to get the most potential we can have, rather than just going with what "the guy at the pro shop" sells us, or guessing.

[bphillips]

I will post up my Cape Buffalo arrow sometime in the next few days and see what everyone thinks, but right now I have to get everything ready to drive to Lufkin tomorrow afternoon and meet with another TBH'er to buy and pick up an RV on Saturday for my deer lease. Long drive there and long drive back, but the best deal I could find over the last week.

My arrow is already made and has been shot and seems to be right on, but need to shoot them out of my new bow and set up and see what they do!

Yours are pretty sweet. Thanks again for letting me try them


Enewman what would this look like numbers wise?

When I shot Dougs arrows I shot the 777gr arrow 223fps and I believe it was 20%foc if I remember correctly

[enewman]

Yours are pretty sweet. Thanks again for letting me try them


Enewman what would this look like numbers wise?

When I shot Dougs arrows I shot the 777gr arrow 223fps and I believe it was 20%foc if I remember correctly

Looking at a broadhead ma

Ma=1 APFT=2.81
Ma= 1.5 APFT=4.21
Ma=2 APFT=6.24
Ma= 3 APFT= 8.44

[bphillips]

Looking at a broadhead ma

Ma=1 APFT=2.81
Ma= 1.5 APFT=4.21
Ma=2 APFT=6.24
Ma= 3 APFT= 8.44

Oh heck yea

Not bad from a 65lb bow