1. ## any ideas guys

i need to know what 690 feet per second converts to in ftlb please anyone

2. It doesn't, the one is velocity and the other is energy.

3. Originally Posted by 8x57
It doesn't, the one is velocity and the other is energy.
well a friend of mine was asking me if his rifle is fireing 690 fps through a crono what does it work out to the nearest ft lb??

4. Originally Posted by mal mason
i need to know what 690 feet per second converts to in ftlb please anyone
You need to specify the mass. Is he firing 25lb shells, or .177 pellets or something in between? Regards JCS

5. Is this the sort of thing you're after? http://www.pyramydair.com/article/Wh..._August_2003/5

6. Originally Posted by klunk
Is this the sort of thing you're after? http://www.pyramydair.com/article/Wh..._August_2003/5
Thanks klunk that was all i was asking spot on sorted now cheers

7. Originally Posted by mal mason
i need to know what 690 feet per second converts to in ftlb please anyone
There's a formula that I'll try and find for you - it's something like velocity x velocity x mass (g) divided by x.... if you're talking about a .22 air rifle pellet they you're under 12ft/lbs, and if you're talking about .17 air rifle pellet you're well under (approx 10ft lbs) - though obviously depends a lot on exact weight of the pellet!

8. Originally Posted by mal mason
i need to know what 690 feet per second converts to in ftlb please anyone

Look down the list, select a pellet weight and type that into the calculator along with your "fps" number and you'll have an answer.

http://extorian.co.uk/shooting/pellets.html

9. Originally Posted by jcampbellsmith
You need to specify the mass...
And this is the correct response.

10. Originally Posted by klunk
Is this the sort of thing you're after? http://www.pyramydair.com/article/Wh..._August_2003/5
LOL yeah that was it - well done klunk!

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