Speed vs Momentum

[BigDaddy96Ag]

http://www.qdma.com/articles/momentum-beats-speed-for-lethal-arrow-hits?utm_medium=email&utm_campaign=July+22+Newsletter+-+LEM+friends&utm_content=July+22+Newsletter+-+LEM+friends+CID_9ac6a352da692ace3e42ed29afcddfd0&utm_source=Campaign%20Monitor&utm_term=Momentum%20Beats%20Speed%20for%20Lethal%20Arrow%20Hits

My uncle just sent me this. Makes sense to me - even the comments at the end. What do you guys think?

[old killer]

The article left some things unclear.
What is the best number, 2.0 or 3.5.
The chart didn't clear that up.
There is no way I'll try to get a 600gr arrow setup. Though I'm not a speed freak, but I do like a bow that is quick and quiet.
Their comments about shooting at longer distance are not revelant. I have killed many animals past 50 yards. With a quiet bow their first response is to look up out of curiosity where as at a closer distance (35yds and in) their response is usually to immidiately exit the area from fear.
There are many other factors in an individual's set up. This is one argument I would pass on.

[str8shooter]

Mudslinger brought this up to me last week. I ran a bunch of calculations using two different arrows (one heavier, one lighter), two different tip weights (100 vs 125), two different nocks (standard vs. Nockturnals) and two different bows set up at different draw weights (60 and 70). I was looking at Speed, KE, FOC and momentum. Just as Mudslinger (and your article) said, the heavier arrow, although slower, has more momentum across the board, thereby giving you a better penetration, which is really what it's all about when you're trying to get an LDP.

[CastAndBlast]

I like it right in the middle....

[El Coyote]

Tag for later

[Mudslinger]

Finally, someone gets it! Extremes on both ends and good stuff in the middle on light vs heavy. It is your choice and all will work, especially on NA game. It is hard to argue on teh heavier arrow, high FOC with the forgiveness, accuracy and bow quietness it gives you.

[str8shooter]

Finally, someone gets it! Extremes on both ends and good stuff in the middle on light vs heavy. It is your choice and all will work, especially on NA game. It is hard to argue on teh heavier arrow, high FOC with the forgiveness, accuracy and bow quietness it gives you.

I was thinking all wrong until you brought it up last week. I was hung up on the KE, which really doesn't work on the arrow side. So I did the calcs for momentum (I actually remembered some of my physics), and a lighter arrow, although faster, will not give you more momentum when shot through the same bow.

I should have done those calculations before I ordered a dozen lighter arrows!

[FLASH_OUTDOORS]

I wonder if the 6 grains per inch at 70lb is with out the the field point?

[str8shooter]

It's 6 grains per pound of draw weight for a 70 pound bow, in which case I would believe the author would be using total mass to include the tip.

[enewman]

I have stopped looking at ke a long time ago. Momentum is what you need to look at. The only problem is there are charts for ke but not momentum. So what is a good number. I have killed many deer with a .4 momentum and so has a lot of people. Look at how many kids kill every year with arrows with momentum being in the .2 range.

Dr ashby wrote a article about momentum and he found that .57 momentum is where to strive for. The problem there is he did this for big African game

I My self chased speed I'm now looking at momentum. My arrow I will will hunt with this year will be around 790 gn at around 220 fps. ( actual speed not tested yet). Will be in the .77 momentum

This is at a 26.5 in draw. Just think if I had a 29 in draw. Momentum would be around .85. People that are blessed with long arms should take the advantage and shoot heavy arrows strive for that speed at that 230 to 250 range and that arrow would be unstoppable

There is a lot of advantage to a heavy arrow. Is it needed for what we hunt no, but if that once in a life time deer was to show up and I made a bad shoulder shot I want my arrow to blow through that bone.

[str8shooter]

I have stopped looking at ke a long time ago. Momentum is what you need to look at. The only problem is there are charts for ke but not momentum.

Here is a chart. Also has a high res .pdf to download.

http://archeryreport.com/2009/12/arrow-momentum-quick-reference-chart/

[TxAg]

Momentum is where it's at

[Javelin]

momentum is what is important for getting an arrow through an arrow. KE doesn't work due to over emphasizing speed. however it may be important to not only look at momentum but also speed as the more speed the flatter the trajectory which could very well help a hunter out.

[Frederick D. Be]

momentum is what is important for getting an arrow through an arrow. KE doesn't work due to over emphasizing speed. however it may be important to not only look at momentum but also speed as the more speed the flatter the trajectory which could very well help a hunter out.

Momentum vs. speed vs. KE....on and on and you have to love the argument. A lot to be said for both and it is hard to nock weight/mass in motion which is KE by the way...energy in motion. I would think that emphasis should be placed on a "well placed shot" more than any one of these. I prefer speed when it comes to hunting animals with laser eyeballs. Cheers!
Fred

[txchuck]

One other thing to add to the mix is that the resistance to penetration in most fluid or semi fluid materials goes up exponentially with speed of penetration.
Chuck