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Air Gun Home Forum Index » General Air Gun Questions and Topics » Stupid noob question????    View previous topic :: View next topic  Stupid noob question????   Posted: Thu Mar 04, 2010 12:40 pm ausher Member Joined: 28 Feb 2010 Posts: 96 Location: SWMO U.S.A. What is fpe? Fire power energy? Well whatever it is how is it calculated? Re: Stupid noob question????   Posted: Thu Mar 04, 2010 1:05 pm broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands ausher wrote: What is fpe? Fire power energy? Well whatever it is how is it calculated? Foot-Pounds of Energy. It can be calculated with a formula that I don't know, so I usually use a converter to do the work for me. http://airgunhome.com/pages/calculators.html (ft/lbs is the same thing) You will want to know why FPE is so important. It's kind of the energy output of a rifle (with a certain pellet). It would be better if marketeers would use FPE in stead of FPS. A 12 FPE rifle can shoot a 5.5 grain pellet at a 1000 fps. A 22 FPE rifle will do this with a 10 grain pellet. Taking this in mind, most rifles will be capable of shooting a pellet over 1000 fps. _________________ BIG GAP   Posted: Thu Mar 04, 2010 1:48 pm Lipoly Veteran Member Joined: 06 Dec 2009 Posts: 241 Location: St. Louis, MO, USA Broom is right...its easiest to just use the calculators. If you are interested in the science behind it, it is really just a derivative of the kinetic energy equation: http://en.wikipedia.org/wiki/Kinetic_energy#Kinetic_energy_of_rigid_bodies. Its relation to FPE is explained here http://en.wikipedia.org/wiki/Muzzle_energy. _________________ Philip RWS 350 .22 w/Leapers 4-16x50 Crossman 1377   Posted: Thu Mar 04, 2010 5:00 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Many manufacturers rate their guns by velocity (feet per second, or FPS), but use a very light pellet to get the highest FPS. Kinetic energy is a better way of comparing guns, and a better indicator of what a gun will do with "normal" weight pellets. For hunting, one FPE per pound of animal is a useful estimate of the gun's capability. It's mass and velocity together - something light must be fast to have the same kinetic energy (FPE) as something heavy and slow. The calculator is easier, but here's the formula: _________________ ¡Listo! ¡Apunte! ¡Fuego! Stupid noob question????     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." Your browser cookies have been reset or you need to register to access the topic in question. Use the 'Register' button near the top left of this page. Click Here for AirGunHome.com Main Page Powered by phpBB © 2001-2004 phpBB Group Partial Styling Supplied by Vjacheslav Trushkin Themes Database.