School me on FPE

First thing I would recommend you to do is to shoot the gun a bit over a chrono and see actual speeds with your favorite pellets. 

Then head on over to AoA scroll down and click on the airgun calculators. https://www.airgunsofarizona.com/Calcs.html Plug in your numbers and you will have actual FPE for your gun and your ammo. 

I like the Vortek kits, specially in 12fpe, but the gun will not be inherently more accurate, but you may achieve better accuracy out of it because it’s shot cycle becomes more tamed, smooth, less jumpy (in my experience)

If you want the same power, likely you need the SHO. The kits come with washers that allow for fine tuning the power depending on what you want. 

Mine has the Sho tune kit in it and it is deadly accurate producing 670 FPS on average with the .22 H&N 14.66 Gr pellet.



Hope PE this helps.

Macarri also makes excellent tune kits and has spacers available for further tuning, I have used both Macarri and Vortek. Macarri is a bit smoother/tame where the Vortek kits seem a bit more powerful and to have a bit more snap to me, both are very good but I have only tried the high power kits in each. 

FPE =. FPS*FPS*g(grains of pellet weight) / 450240

780*780*25.4 / 450240. = 33.7 FPE

1 FPE=The energy required to move 1 pound 1 foot. And so on.

Therefore, 12 ft/lbs equals the energy to move 12 lbs 1 ft.

Mike

I'm thinking that the only reason to wonder what the FPE is at any range would be to know whether or not you can kill a squirrel at that range. All numbers and calculations aside....if it will blow through both sides of a soup can then you are golden. If it only goes through one side and just dents the other side then you need to shorten the range or try a different pellet.

If it will blow through 2 soup cans completely then you're probably good to take on racoons and such with a head shot.

1 FPE=The energy required to move 1 pound 1 foot. And so on.

Therefore, 12 ft/lbs equals the energy to move 12 lbs 1 ft.

Mike

Click to expand...

Always wondered, does that mean it will swing a 12lb block of steel 1 ft. (Like if it was suspended by a rope).

Or does it mean that it would scoot a 12 lb. block of steel across a slick floor 1 ft. ? (Because I doubt that a pellet at 12 ft/lb would do that).

The velocity+weight=ft/lbs. theory has alot of holes in it. Take a golf ball for example.....Do you think you could penetrate a car door by driving a golf ball into it ? According to the calculation theory being used for projectile energy you should not only be able to penetrate the door, you should be able to penetrate the whole damn car.



Not even Tiger Woods could pull that off. 

Sir,

Being that your 97 is in .22 I would recommend a full power kit from ARH. 

The 12ftlbs kits are primarily designed for the .177 just my 2 cents.

1 FPE=The energy required to move 1 pound 1 foot. And so on.

Therefore, 12 ft/lbs equals the energy to move 12 lbs 1 ft.

Mike

Click to expand...

Always wondered, does that mean it will swing a 12lb block of steel 1 ft. (Like if it was suspended by a rope).

Or does it mean that it would scoot a 12 lb. block of steel across a slick floor 1 ft. ? (Because I doubt that a pellet at 12 ft/lb would do that).

The velocity+weight=ft/lbs. theory has alot of holes in it. Take a golf ball for example.....Do you think you could penetrate a car door by driving a golf ball into it ? According to the calculation theory being used for projectile energy you should not only be able to penetrate the door, you should be able to penetrate the whole damn car.

Not even Tiger Woods could pull that off.

Click to expand...

I've seen a 2x6 piece of pressure treated lumber explode when hit with a golf ball from 20' away at a driving range. So I personaly believe it could get through two doors if hit properly. 

1 FPE=The energy required to move 1 pound 1 foot. And so on.

Therefore, 12 ft/lbs equals the energy to move 12 lbs 1 ft.

Mike

Click to expand...

Always wondered, does that mean it will swing a 12lb block of steel 1 ft. (Like if it was suspended by a rope).

Or does it mean that it would scoot a 12 lb. block of steel across a slick floor 1 ft. ? (Because I doubt that a pellet at 12 ft/lb would do that).

The velocity+weight=ft/lbs. theory has alot of holes in it. Take a golf ball for example.....Do you think you could penetrate a car door by driving a golf ball into it ? According to the calculation theory being used for projectile energy you should not only be able to penetrate the door, you should be able to penetrate the whole damn car.

Not even Tiger Woods could pull that off.

Click to expand...

I've seen a 2x6 piece of pressure treated lumber explode when hit with a golf ball from 20' away at a driving range. So I personaly believe it could get through two doors if hit properly.

Click to expand...

Yeah you'd think golf would be a more dangerous sport, what with all those high velocity missiles flying around. It's a wonder that 100's aren't killed weekly.

I always thought it was suppose to mean that 12 lbs of energy was what the actual pellet felt like when it hit the target at a distance. At the point of impact, which with a .22 caliber pellet would "feel harder" since it has a larger cross section than a .177. Which would explain why most .177 pellets just zip right though an animal and the .22 has more thump???

Maybe



Ray

I’m Not anywhere near the knowledge some guys are on ballistic coefficients, kinetic energy etc etc but in my simple mind it has to do with weight and momentum. So this simple explanation suits me.

Drop a 1 oz steel ball bearing on your foot from a height of 4 feet. Did that hurt? Probably not too much, eh?

Drop a bowling ball on your foot from the same height. Did you have to go to the hospital?

Not taking into account air resistance, both objects reached the same speed and reach its target at the same time, except one crushed your foot, while the other just made an ouchie.

Gary

. there is some place whereb dr beeman mentions how many footpounds are needed to kill this and that . it is older literature , but i think the animals are about the same , so it should be relevant . some wadcutter gave me (yet another) a redball for mentioning an article in the free monthly magazines that they would send out back in the 80's. they were promoting the newly released beeman p1 (hw45) pistol in a cool article where they were killing backyards possums using the .177 (stainless steel head) prometheus pellets and a scoped beeman p1. does anyone have access to that data dr beeman put out ? - valhalla redballa .

" so what did i get inside when it was shipped to me "

Factory parts one might think?

JM makes an outstanding kit or two for that rig.



John

factory parts yes, but what FPE is the factory parts putting out ?

does either of the vortex kits give me factory FPE ?-- same FPE as when i bought it new ?

higher AND lower FPE ?

im only interested in the vortex kits,



thank you

Click to expand...

You probably have the FAC version (higher than 12fpe) like I said before, it’s a good idea to run it over a chronograph and see what numbers you are getting.

where did you buy the gun from? They should have hd a description, most places do. If not, call them and ask. 

If you install a SHO Vortek, it should give you about the same power of the factory installed parts, only it should be a bit more flexible by adding washers (spacers) and smoother.