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Old July 20th, 2008, 07:18   #16
AK Guru
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Join Date: Mar 2005
Location: Vaughan, Ontario (near Toronto)
Ive worked on a mechbox that fired 450-460 with .2gs. Chronied 345-355 with .3s.
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Old July 20th, 2008, 21:39   #17
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Join Date: Jun 2002
Location: Toronto
Originally Posted by CDN_Stalker View Post
That's only an fps/weight to joule converter...
No it's not, it also converts backwards as well. Check it out again - the second button does a reverse calculation.

Enter 460 as the first FPS and 0.20g as the BB Mass and hit "Convert FPS to Joules".

At the top, you will see your answer: "A 0.20g BB leaving the barrel at 460 fps will contain approximately 1.97 joules of energy."

Now in the second section, enter 1.97 as the energy and 0.30g as the weight.

This is the answer returned: "A 0.30g BB containing 1.97 joules of energy will leave the barrel at approximately 376 fps."

Therefore: 460-376fps = an 84fps drop by switching from 0.20g BBs to 0.30g BBs.

As mentioned already: keep in mind that this is NOT a valid way to make your gun gameable if you exceed velocity limits. You will still exceed allowable field limits due to the energy exerted.

Last edited by ILLusion; July 21st, 2008 at 00:18..
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Old July 20th, 2008, 21:57   #18
Polar Nova
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Join Date: Jul 2008
To answer or confirm your question, you should see a 60-70 FPS drop. .30g BB's are pretty heavy. How about putting in an M120 spring for your gun?
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Old July 23rd, 2008, 02:32   #19
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Location: Fort Saint John BC
yeah i changed it for a G&p M120 gearbox, now i have two mechbox's, going to build the other one into a project gun.
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