Click Here for AirGunHome.com Main Page AirGunHome.com: THE Worldwide Airgun Forum

Air Gun Home Forum Index » General Air Gun Questions and Topics » Ballistic Coefficients and Insecticides Goto page 1, 2  Next    View previous topic :: View next topic  Ballistic Coefficients and Insecticides   Posted: Sat Jan 17, 2009 10:31 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA I was poking around and found these references. The first is an estimation of ballistic coefficient using form factor (shape), mass, caliber, and length. This is the Babel Fish translation from Spanish: http://babelfish.yahoo.com/translate_url?doit=done&tt=url&intl=1&fr=bf-home&trurl=http%3A%2F%2Fwww.galeon.com%2Ftodoaire%2Fbalines%2Fcoeficie.htm&lp=es_en&btnTrUrl=Translate And this is the original link (in Spanish): http://www.galeon.com/todoaire/balines/coeficie.htm The second is a discussion of terminal energy. Farther down the page is a formula to calculate the minimum requirements for hunting different types of small animals. Again, the translation: http://babelfish.yahoo.com/translate_url?doit=done&tt=url&intl=1&fr=bf-home&trurl=http%3A%2F%2Fwww.galeon.com%2Ftodoaire%2Farticom%2Fmfit.htm&lp=es_en&btnTrUrl=Translate And the original link (in Spanish): http://www.galeon.com/todoaire/articom/mfit.htm The last one is a little strange - insecticides plus pellets. The author describes the use of lead airgun pellets to deliver insecticides into larval nests of "Processionary Moths" (Gypsy Moths, maybe?). This apparently causes caterpillar "vomiting," "diahrrea," and "agony": http://babelfish.yahoo.com/translate_url?doit=done&tt=url&intl=1&fr=bf-home&trurl=http%3A%2F%2Fwww.galeon.com%2Ftodoaire%2Frejat%2Fbalinsec.htm&lp=es_en&btnTrUrl=Translate And the original link (in Spanish): http://www.galeon.com/todoaire/rejat/balinsec.htm Go get a cup of coffee; these are going to take while to wade through. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Sat Jan 17, 2009 11:20 pm cw Banned Joined: 10 Feb 2008 Posts: 1771 Right.   Posted: Sun Jan 18, 2009 4:58 pm broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands That was a rather interesting post. Interesting and weird. CW, you don't have to post if you don't really have anything to say, you know. _________________ BIG GAP   Posted: Sun Jan 18, 2009 6:06 pm cw Banned Joined: 10 Feb 2008 Posts: 1771 That's as true today as it was a year ago, that's why I posted something. As long as we're stating the very obvious, I just have to say that you made a statement, also.   Posted: Sun Jan 18, 2009 6:11 pm DeadEye Member Joined: 25 Dec 2008 Posts: 72 Location: Oklahoma Good post. That had me going for a few hours this morning. I was following the links that started there and thats what leed me to the lime thing. _________________ Crosman Quest 800x- .22 Cal 800 FPS   Posted: Sun Jan 18, 2009 7:06 pm oddtodd Silver Status Member Joined: 30 Dec 2008 Posts: 2029 Location: Richmond, IN USA Anybody hear the ZOOOM as that went right over my head? _________________ Airguns: Two starlings talking "Larry, did you hear that? Larry?? LARRY!!!!"   Posted: Sun Jan 18, 2009 10:24 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA I took the formula describing minimum performance per pound of animal being hunted and put it into a spreadsheet. While the results are within the realm of reason, they are different than the "1 FPE per pound of animal" that I'd heard before. It's also interesting that the guy's formula shows lighter pellets needing not only more FPS but more FPE for the same size animal. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Mon Jan 19, 2009 7:18 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND Phew! My coffee’s gone cold reading this, very interesting slavia especially as I have a Walther Lever Action, but using it over 50m that’s something else, 25m is the max that I have tried probably because I have never taken it anywhere to shoot, that was longer than 25m, next time I go out in the woods I’ll take it along and give it a go. The only problem I can see is that using peep/iron sights over that distance could be difficult, plus the questionable accuracy over that range. But I’ll give it a go. Just one thing after reading through this article two or three times, where does it say “Insecticides”? it was that, that intrigued me in the first place. Al _________________   Posted: Mon Jan 19, 2009 7:26 am broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Hey Al, how much is the Lever Action supposed to deliver in Fpe? I recon it would be about 12? _________________ BIG GAP   Posted: Mon Jan 19, 2009 9:39 am oddtodd Silver Status Member Joined: 30 Dec 2008 Posts: 2029 Location: Richmond, IN USA Thank you for putting it in a format I can understand Slavia. It makes sense to me now. _________________ Airguns: Two starlings talking "Larry, did you hear that? Larry?? LARRY!!!!"   Posted: Mon Jan 19, 2009 10:08 am Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Quote: where does it say “Insecticides”? The insecticide references are the last two. I put both the translation and original Spanish in for those that can read the original. Here's the English one: http://babelfish.yahoo.com/translate_url?doit=done&tt=url&intl=1&fr=bf-home&trurl=http%3A%2F%2Fwww.galeon.com%2Ftodoaire%2Frejat%2Fbalinsec.htm&lp=es_en&btnTrUrl=Translate The stuff about ballistic coefficients and terminal energy are at least usable. That last bit about the insecticides is so very strange I just had to put it in. What's next, incendiary pellets? _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Mon Jan 19, 2009 10:34 am Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA The formula for estimating ballistic coefficients is the same as can be found elsewhere, plus a "fudge factor" for length. Here is the same formula minus that refinement: http://www.chairgun.com/BC%20Guide.pdf For example, take RWS .177 Superdomes (8.3 grain). Working the formula without the "fudge factor" you get BC=0.0146. All the published sources I could find said BC=0.0140, which is essentially the same. Adding in this guy's refinement brings it to BC=0.0176. I guess I'll have to wait until spring to see if this is an accurate tool in the real world. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Mon Jan 19, 2009 10:57 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND broommaster2000 wrote: Hey Al, how much is the Lever Action supposed to deliver in Fpe? I recon it would be about 12? I reckon between 10.5-12fpe depending on the temperature, but I think 50m is pushing it a bit, especially for hunting. The Coke cans were shot at 30m which is about right, he does state that the Walther is on the limit using iron sights, and scope mounts for these guns are not very good. Shooting the 5LCarafe at 50m with a 28cm drop, I think depends upon the thickness of the plastic? But there again I haven’t tried it, so when the better weather comes I certainly will. Al _________________   Posted: Mon Jan 19, 2009 11:07 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND Slavia wrote: Quote: where does it say “Insecticides”? The insecticide references are the last two. What's next, incendiary pellets? Yea I was looking at the wrong translation, as for "Whats Next" how about a rat poison pellet for the anti hunting clan.? Al _________________   Posted: Mon Jan 19, 2009 3:02 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Hollow point cheese pellets, filled with anticoagulant rat poison. You just lob the food in front of them, and then watch as they hemorrhage to death. That would satisfy the animal rights folks. _________________ ¡Listo! ¡Apunte! ¡Fuego! Ballistic Coefficients and Insecticides     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 2   Goto page 1, 2  Next 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.