RE: What is the best way to get kinetic energy II
 

108 Ft/lb of KE

RE: What is the best way to get kinetic energy II
 

You got that right.

I'm no expert but from what I've read, 35 ft/lbs is adequate for whitetail deer. If you back up 40 yards and 35 ft/lbs I'd guess maybe that translates to around 40 ft/lbs at launch so I would think you've got plenty of punch. For the past 10 years I've been launching pretty close to 50 ft/lbs. The farthest I've taken a whitetail is only 35 yards but the arrow passed through and was buried maybe 6 inches in the ground. In the last 10 or 15 years I don't think I've ever not had the broadhead poke a hole through the other side of the deer. Maybe not fly into the ground but holes both sides none the less.

RE: What is the best way to get kinetic energy II
 

Syl did you pick up the Old Glory? Sure is a sweet shooter.


As I posted earlier when the tough guy nazi showed up my Allegiance pushes 80ft/lb of KE at 70.5# 299.6fps and 400 grains.

That is unreal!

RE: What is the best way to get kinetic energy II
 

No, I'm still debating with myself. It's a fair chunk of change and I've bought quite a bit of other equipment lately so I'm thinking I'll wait a while. Funny though I took a friend to look at one. He shot it (an Old Glory) and ordered one a couple days later.

I'd say you're set for any big game animal in North america, probably Africa too.

RE: What is the best way to get kinetic energy II
 

Are you guys glad i started this????

RE: What is the best way to get kinetic energy II
 

How about this why would someone give up energy/momentum (Which kills the animal) for a trivial amount of speed? I just don't see it.

RE: What is the best way to get kinetic energy II
 

Well E when is enough.... enough? 400 grains at 80 ft/lb isn't enough? Where do you stop?

Ok lets add 210 grains and subtract 70fps....


SO 610 grains at 230 fps only yields 72 ft/lb of KE

Perhaps I should shoot that setup instead from what you are saying?

RE: What is the best way to get kinetic energy II
 

Momentum in slug ft/sec = Arrow weight in grains divided by 225120 times velocity
Kinetic Energy = Arrow weight divided by 450240 times velocity times velocity.

In your case momentum = (550/225120) times 297 = .73
Kinetic Energy = (550/450240) times 297 times 297 = 107.8

RE: What is the best way to get kinetic energy II
 

Speed gives you a flatter trajectory which actually improves accuracy which of course is a good thing. As long as you have "excess" energy to do the job that energy will be wasted unless you channel it to velocity where it can be used to flatten the trajectory. Let me exagerate to make the point. Lets say it takes 10 units of energy to pass an arrow through a deer and lets say you have 100 units available. Theoreticaly you could shoot an arrow through 10 deer if they were lined up just right. But wouldn't it make more sense to use say just 20 units for driving the arrow through and the other 80 channel into velocity? You're still sure you can kill the animal but you also are putting the exess energy to good use rather than wasting it.

RE: What is the best way to get kinetic energy II
 

Buckeye why don't you ever look at momentum. It is what determines penetration. Put in an arrow that goes 1000FPS at 40 grains. What is the KE? More than your arrow, would this arrow penetrate better than yours? NO so look at Momentum, hey what do you know, it has a lot less momentum than your arrow. It only makes sense, if you think about it. :eek: