Reply With QuoteSorry, I don't. If ever I wanted to shoot .22 cal I would be using one go my rimfire rifles.Originally Posted by b.b
Neil
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Thanks Neil 👍
Do you have for .22 as well
I should be making swarf!
Sorry, I don't. If ever I wanted to shoot .22 cal I would be using one go my rimfire rifles.
Neil
Current airguns:- Steyr LG110: Steyr LP10: Air Arms HFT500: Weihrauch97 fully customised.
Mushroom Man
For those wanting .22 (and .177 for that matter) I have Excel charts for both calibres ... not sure where they came from but my file is dated 2013. I did laminate copies and find them very useful.
If you want copy/copies just let me know by PM. I apologise in advance to Neil because I could not open his download photobucket file so do not know if my files are the same or not . Pellet weight vs velocity for range of weights and ft.sec giving ftlb.
Cheers, Phil
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This is a really easy site to use, https://airguncalculator.com/
Registered User
Spent 10 mins this morning with the laptop over breakfast knocking these up:
Always looking for any cheap, interesting, knackered "project" guns. But not lathes. I have too many lathes. Thanks, JB.
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Brilliant 👍🏻👌
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Very kind, thank you very much for that. What the charts clearly show is that it doesn't take much at all to exceed the 12ft lb limits. Just a few feet per second will take you over.
An Emergency on your part doesn't necessarily mean an Emergency on my part!
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'Morning All,
I thought this might be useful as an alternative to tables.
Print the file then just place a rule on the outer pellet weight and velocity scales then read off the energy on the middle scale; the dotted line shows an example.
Best Regards,
Bill.
Registered User
that's actually really cool.. not seen that format before.
Always looking for any cheap, interesting, knackered "project" guns. But not lathes. I have too many lathes. Thanks, JB.
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Have sent PM
Is this still available.
Many thanks
Registered User
That is really handy thank you.`
Registered User
This may help.
FPS = Feet Per Second, MPS = Meters Per Second, FPE = Foot Pounds of Energy.
To convert to Joules multiply FPE by 1.3558, Joules to FPE multiply by .7376
To convert MPS to FPS, MPS x 3.2808399 = FPS .
To convert FPS to MPS, FPS x .3048 = MPS.
FPE Formula is Pellet weight (gr) x FPS x FPS divided by 450240 or 450436.7.
450240 is 2 x velocity of gravity x 7000, (2 x 32.16 x 7000 = 450240)
450436.7 is 2 x velocity of gravity x 7000, (2 x 32.17405 x 7000 = 450436.7)
The constant 450240 or 450436.7 depends on which value you use for the velocity of gravity, (acceleration due to gravity).
32.16 ft/s/s or 32.17405 ft/s/s. There are 7000 grains in one pound.
The difference does not matter which ever constant is used for the FPE calculation.
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