# What are Foot Pounds of Air Rifle Hunting Energy : American Airgunner

What are Foot Pounds of Air Rifle Hunting Energy : American Airgunner

Air Rifle Experts Talk Foot Pounds of Energy for Air Gun Hunting in this round table from American Airgunner TV.

Enjoy this Throwback Round Table with examples that explain foot pounds of energy as it relates to air rifle hunting.

Thanks to Rossi Morreale, Tom Gaylord, Jim Chapman, and Rick Eutsler for continuing to educate about air guns!

Get all things airguns from: http://www.pyramydair.com

Subscribe to our Airgunner Facebook page:

http://www.facebook.com/AmericanAirgunner/

Buy Umarex Airguns direct: http://www.umarexusa.com

In all the videos I’ve watched in foot pounds I’ve never heard it put so clearly as to move one foot per one pound so thank you for being the first to make it so clear.

How is No1 going to mention that this guy’s name was Tom gaylord

Go Metric.

I wish that young guy would shut up and let the men talk and explain things. He sounds like he’s on speed or something and it’s incredibly annoying. The other men are providing valuable information. The young guy doesn’t need to be there.

Can’t watch that prat – he should shut his face and leave it to the man who knows. 😩🥴🥺🤪

Excellent video extremely informative and easy to understand thanks for the video!!!.💎😎

I know this is you tube and I am setting myself up to be a target.. But I still don’t understand what ft lbs means. . So let me ask this. If I shot a 14g pellet out of a rifle at 12ft lbs. how is it going to be different from a rifle shooting the same pellet at 30ft lbs?

the formula is 1/2 x Mass X Velocity X Velocity=Kinetic Energy in US units the units work out as ft-lb . In US we use lbs so we have to divide by 32 to get slugs.

I really like u gays. Very nice topics u always choose

To the clueless guy @ the round table If you can’t understand ft lbs of energy vs fps then put the gun down & start over. Learn the basics this isn’t Rocket Science

And the maths is Force /energy = mass x velocity

Its fare to say the a bullet standing on end doesn’t have 650 ft lbs against it??

I really appreciate these video’s. Very Informative. My only suggestion is that the audio volume be addressed as I’ve noticed that the video volume in general is way too low. With my device volume all the way up its hard to hear. I notice this on my phone as well as my laptop.

"It’s the energy to move one pound, to one foot of distance." WTF? This is not true. One ft-lb is the energy that an object has after being accelerated by one lb of force FOR one foot of distance. VERY different.

The interviewer is about as annoying as anyone I’ve listened too. FPS does matter but only in the context of how much weight it is pushing.

I’m in the UK and this video was the most relaxed and easy to understand video I’ve come across and as a newbie to air rifle / pistol shooting everything became very clear . Cheers fellas Johnnie Cohen

Ft lbs and horsepower are not the same.

Very amusing it’s only ft lb. It’s not that difficult if you’re English 12 foot-pounds good enough for anyone. It’s all about the hold over and under.

Think about what you could break by throwing a small rock , then throwing a big rock at the same speed

Ha…

"Gaylord"

It’s not hard to understand, just think about a bug and a windshield.

In NJ, air guns, BB guns, and sling shots, all need the same purchase permit to by and register.

stop using retarded measurements!

use Meter/Kilogram

Foot pounds and velocity are kind of like horsepower and torque, people can get hooked on the wrong importance of each sometimes…

It’d be a lot easier for everyone if manufacturers just told the truth, in FPE , about how much energy their guns made. Pellets are only aerodynamically stable up to around 930 FPS, so advertising 1250 is just fostering the wrong mentality about airguns… and intentionally creating expectations that will make their own products less accurate.

They state ft lbs, when it is lb ft, good start.

Ft/lb is the energy to lift 1 lb, 1 ft. Not move 1 ft.

Sorry, but Tom Gaylord went into an explanation that put most people to sleep. Cam we circle back for references that can mean something to modern people?

The host is very annoying and lacks self awareness. Starts by saying this is one of his favorite subjects, then proceeds to not even remotely understand what the experts are talking about, but still insists on interrupting their very informative explanations every 1/2 minute or so to say something irrelevant or just plain dumb. And he does all of this after starting the video by calling us viewers, and I quote, “maybe less intelligent”. What a jackwagon. I’m glad Tom and Jim stood up for everyone who just wanted to watch a video to gain knowledge. Not knowing air gun jargon doesn’t make one “maybe less intelligent”, it just means one has not learned the lexicon. Great guests, terrible host.

I’m pained by the lack of physics understanding, though the confusing nature of Imperial Units doesn’t help. I’ll try and give a concise explanation of the relevant physical concepts here, but before discussing foot-pounds specifically, I think it will help to talk more generally about energy. When considering a moving projectile, the energy we care about is kinetic energy, the equation for which is given by:

Kinetic Energy = 1/2 x mass x velocity^2

We can see here why both mass and velocity are important, increase either and you increase the kinetic energy (though the effect is squared for velocity). There are many factors which determine how much damage a projectile will do (size, fragmentation, etc.) but the maximum destructive power is a function of kinetic energy. This is why kinetic energy is the most important measurement for a projectile.

Foot-pounds is just a measure of energy, and using the kinetic energy equation you can understand how velocity and mass impact the foot-pound measurement. Understanding where the foot-pound unit comes from and how to calculate it is somewhat more complicated, so stop reading here if you don’t want to get into the weeds.

Work and energy are related by the work-energy theorem which states that: net work = change in kinetic energy. This equality between work and energy means they can be measured with the same unit, hence foot-pounds is a unit of work and energy. I bring this up because the origin of foot-pounds is more easily understood as a measurement of work. Work is force multiplied by distance. In the case of foot-pounds, 1 foot-pound = 1 pound-force x 1 foot. Here we have introduced unit you may not be familiar with: the pound-force (lbf). This is simply the amount of force that 1lb (mass) exerts when under standard gravity (the gravity at sea-level). Since the acceleration of standard gravity is ~32.17 ft/sec^2, we have that 1lbf ≈ 32.17 ft*lb/sec^2, and so we have:

1 foot-pound ≈ 32.17 lb*ft^2/sec^2.

So if we have a projectile with mass in grains, M, and velocity in feet per second, v, how can we calculate it’s foot-pounds? Starting with the equation for kinetic energy we can write:

KE = 1/2 x M x v^2 grains*ft^2/sec^2

Note the units: grains*ft^2/sec^2. To change it to foot-pounds we need to do some unit conversion. First note that there are 7000 grains per pound, so we can rewrite our energy as:

KE = 1/14000 x M x v^2 lb*ft^2/sec^2

Now to get to foot-pounds all we have to do is divide by the ≈ 32.174049 lb*ft^2/sec^2 there are per foot-pound (I’ve used a more accurate approximation for standard gravity in this final equation). This gives an equation for kinetic energy in foot-pounds:

KE ≈ M x (v)^2 /450437 foot-pounds.

So with a shooting chronograph measuring feet per second and the known mass of the projectile in grains, you can use the above equation to calculate its foot-pounds.

OK… What is the math equation for speed,grain to equal the ft#

Thank you gentleman it was so useful

and the penetration ??, more area for the big calibre, less pressure impact can you explain ? how afect the area?

Wonder if that guy has any idea how annoying he is. Shame, otherwise great video.

The host guy said to explain to the less intelligent people jiji along the interview he was the less intelligent.

Not easy to understand? You simpleton

the ads suck

How much ft/lb does one need to lay down a Bigfoot?

Poor British bastards their government is even controlling the energy of their airguns 12 fpe crap

Jim Chapman has a better perspective to listen to.

I am new to air gunning but not new to physics, that bringing said I don’t know it all BUT a foot pound in a lever is is the rotational force called a torque that is created when you hold 1 pound a distance 1 foot away. If you have 2 foot pounds it is holding 2 pounds a distance 1 foot away OR holding 1 pound 2 feet away. The velocity is the feet per second or ft/sec. The energy you speak of is MOMENTUM. a bigger pellet moving at the same speed as a smaller pellet has a bigger momentum. If you increase the speed you increase the momentum there are limits of course like air resistance. So a pellet which has had twice the foot pounds applied to it will not necessarily have twice the velocity and there fore not have twice the momentum. NOW I know what these words mean but I don’t know exactly how it applies to air guns obviously there is no 1 foot long lever inside the air gun. It may mean the gun create a force that is constant for 1 foot. It may mean the gun creates a force needed to balance an unbalanced lever. This video did not help me I think the guns should be rated in pounds not foot pounds. But this may help you guys:

Moment ft-lbs = force lbs x distance ft

Momentum = velocity x mass

they left a lot on the table. "12-20 fpe regardless of caliber" ,,, .22 gets the hunting nod in most books.

FTLBS ARE NOT A UNIT OF ENERGY THEY ARE A UNIT OF WORK!!!!!!!

I must admit I enjoyed the video though

Host: "The more you know the less you care, right?"

Several thousand people: Watching Paul Harrell "tediously" shoot a chronograph and calculate energy foot-pounds.

Sure buddy. Sure.

12 foot pounds is enough for any game no bigger than rabbit out to 40yards,dont hunt with anything less than 10. Simple.

The guy in the checkered shirt should ask a question and then SHUT UP ! SOOOO ANOYING ! I turned it off ! wanted to hear the info , but couldn’t take it ! Bill Hare in NJ

Instead just say force=mass x velocity

Bring back these round table videos

So look on line for simple physics of defintions of weight (mass) , velocity ( measured as distance over time in feet per second or meters per second), or work or energy,etc…..the guys in this video do a good job, but some simple definitions will go a long way to better understanding how all this works.