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Air Gun Home Forum Index » General Air Gun Questions and Topics » equation needed    View previous topic :: View next topic  equation needed   Posted: Sun Dec 14, 2008 8:15 am dummyracer36 Senior Member Joined: 21 Sep 2008 Posts: 723 Location: St. Louis, Missouri whats the equation to determine fpe? _________________ "not tonight dear, i have a race in the morning"   Posted: Sun Dec 14, 2008 8:58 am Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA FPE=(v)*(v)*(m)/450240 v=velocity in feet per second m=mass in grains So that's mass times velocity squared, all divided by 450240. The constant is for lead projectiles; any other material would have a different number. You can also use the forum calculator (called "energy and measurement calculators" on the home page): http://www.airgunhome.com/pages/calculators.html Happy calculating. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Sun Dec 14, 2008 8:59 am dummyracer36 Senior Member Joined: 21 Sep 2008 Posts: 723 Location: St. Louis, Missouri thanks alot !!! _________________ "not tonight dear, i have a race in the morning"   Posted: Sun Dec 14, 2008 12:30 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC Actually, mass is mass, be it lead or feathers.... The constant is the same, regardless of the material.... Bob   Posted: Sun Dec 14, 2008 12:57 pm AirGunEric Site Admin Joined: 20 Jan 2007 Posts: 6929 Location: "Out There" You could do it the 'easy' way too: http://www.airgunhome.com/pages/calculators.html _________________ ` I'd say "I care." But I'd be lying. Canadian Airgun Supplier: http://www.scopesandammo.com/storefront   Posted: Sun Dec 14, 2008 1:05 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA What could I have been thinking! I probably got confused converting from grains to pounds to slugs to grams and then factoring in the inverse hyperbolic integral of the cosmic ray vector (on alternate Tuesdays). Sorry, it won't happen again. You're right; mass is mass. http://en.wikipedia.org/wiki/Muzzle_energy _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Sun Dec 14, 2008 2:24 pm cw Banned Joined: 10 Feb 2008 Posts: 1771 ryr4yt6 Last edited by cw on Fri Jan 23, 2009 9:08 pm; edited 1 time in total   Posted: Sun Dec 14, 2008 6:15 pm Jaxom Senior Member Joined: 06 Aug 2008 Posts: 927 OY!!! and I told my mother and teachers in highschool I would never need to know algebra!!!! _________________ .22 2300kt Crosman Custom   Posted: Sun Dec 14, 2008 7:06 pm fritz Silver Status Member Joined: 25 Nov 2008 Posts: 2442 Location: New Jersey- outside of Philadelphia Jaxom, who says you have to do it? Use a calculator. _________________ "I never set out to be wierd, it was always everyone else who called me it" -Frank Zappa Speed is impressive, accuracy is deadly. It's not that I'm not a people person, it's just that I'm not a stupid people person.   Posted: Sun Dec 14, 2008 7:58 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Quote: There is implied mutiplication between adjacent variables (such as M and V). You're correct, of course, and I knew that. These days it's hard to know where a person's ability lies - be it "pure" algebraic notation, calculator notation, spreadsheet notation, whatever. I threw in the extra punctuation (and the verbal explanation) to increase the probability that the formula would be successfully applied. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Sun Dec 14, 2008 8:36 pm yourdaddyjoe Supporting Member Joined: 26 May 2008 Posts: 4027 Location: Tatorville, USA Slavia wrote: Quote: There is implied mutiplication between adjacent variables (such as M and V). You're correct, of course, and I knew that. These days it's hard to know where a person's ability lies - be it "pure" algebraic notation, calculator notation, spreadsheet notation, whatever. I threw in the extra punctuation (and the verbal explanation) to increase the probability that the formula would be successfully applied. _________________ Say "NO" to BB Gun Wars... Quid Pro Quo Rule: An eye for an eye... www.HPASports.com www.Facebook.com/hpasports   Posted: Mon Dec 15, 2008 5:31 am broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Dyson sphere. _________________ BIG GAP   Posted: Mon Dec 15, 2008 6:19 pm Jaxom Senior Member Joined: 06 Aug 2008 Posts: 927 Fritz, In order to use the calculator, I need to know what the alphebet soup stands for. _________________ .22 2300kt Crosman Custom equation needed     Air Gun Home Forum Index » General Air Gun Questions and Topics You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum All times are GMT - 5 Hours   Page 1 of 1   All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First  Select a forum Main Forums----------------AirGunHome Q&AGeneral Air Gun Questions and TopicsPicture GalleryTarget Shooting: Casual, Fun and CompetitionHunting, Pest Control, Varminting People/Events/Airgun Issue Discussion----------------Introduce YourselfThe BS TopicClubs/Events/Regional/Political Airgun Issues Maintenance, Modification and Reviews----------------RiflesPistolsAntique, Collector and Novelty AirgunsBB GunsPellets/AmmoOpticsAccessoriesAirgun Smithing Buy, Sell or Trade Forums----------------For SaleWant to Buy   Note: If you are seeing "Please enter your username and password to log in." 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