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Air Gun Home Forum Index » The BS Topic » 2000 LB projectile velocity? Goto page 1, 2  Next    View previous topic :: View next topic  2000 LB projectile velocity?   Posted: Tue Feb 07, 2012 7:07 pm kodiakdan Member Joined: 13 Dec 2011 Posts: 46 Location: South Central Iowa How much muzzle velocity would it take to propel this 2000 LB armour piercing projectile to a range of 23 miles like they said on the tour?   Posted: Tue Feb 07, 2012 7:37 pm MSEO Member Joined: 26 Nov 2011 Posts: 30 I make it about 1970 ft/s if you ignore air resistance. Another acceptable answer would be: PDQ! Wikipedia says 2,500 to 2,690 ft/s. If that is the 16"/50 caliber Mark 7 gun.   Posted: Tue Feb 07, 2012 10:01 pm radar Silver Status Member Joined: 13 Nov 2011 Posts: 1138 Location: Des Moines, Iowa, USA I believe that's right, about 2700 fps. You will need a big spring. _________________ It's never too late to have a happy childhood.   Posted: Tue Feb 07, 2012 10:44 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC 2000 lb. at 2700 fps is.... drum roll please.... 113,340 ft. tons muzzle energy.... 226,679,000 FPE.... Plus the added "bang" of the HE at impact, of course.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Tue Feb 07, 2012 10:53 pm kodiakdan Member Joined: 13 Dec 2011 Posts: 46 Location: South Central Iowa Thanks for the info. Thats still pretty fast. Yep, it is a 16" gun. The powder is in the thing to the guys LH side. Probably really not powder but they probably have something in the silk bags to make it look that way. I think they said it took 9 or 10 of the bags to load the gun. The barrels are made on a hydraulic system so they retract 4 feet to absorb the recoil. No body is allowed on deck while firing. The blast makes the water smooth they say. This is all on the USS Missouri that is on display at Pearl Harbor that we toured last week. Just thought everyone might like to see this. Notice the copper ring around the base of the bullet. It is made in a cup fashion facing reward. I figured it was to provide a better seal in the barrell. I think they said the barrells weighed 88,000 LBS.   Posted: Tue Feb 07, 2012 10:54 pm SMP Silver Status Member Joined: 04 Feb 2011 Posts: 1183 Location: Just south of "Out There"- Land O Lakes Ontario 225 million fpe.....Hmmm you could definitely hunt womp rats with that. _________________ Sean   Posted: Wed Feb 08, 2012 12:11 am Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Bob - as an airgunner, doesn't it give you a bit of a tingle to even contemplate the term "foot-tons"? Just as an aside, go to the satellite images on Google and look at Pearl Harbor. You can still see the oil plume leaking from the Arizona. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Wed Feb 08, 2012 12:17 am donec Senior Member Joined: 19 Dec 2009 Posts: 836 Location: central Texas Pflugerville area I know co2 would not have the power but what would it take to fire that thing in a pcp?   Posted: Wed Feb 08, 2012 12:43 am rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC A 16" barrel (bore, not length) and a lotta air!.... Surprisingly, it would only take 10 psi to support the weight of the shell.... so if you could make a guess how much friction there would be to make it slide down the bore you could figure it out.... If it took another 2000 lbs to overcome the friction then 20 psi of air would make it move.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Wed Feb 08, 2012 1:01 am Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Even at 20 P.S.I. how long would it take to hand-pump the volume you would need? _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Wed Feb 08, 2012 10:25 am radar Silver Status Member Joined: 13 Nov 2011 Posts: 1138 Location: Des Moines, Iowa, USA I still think a spring-piston. Didn't some 19th century ships using dynamite guns...to launch the relatively unstable dynamite filled shells...use compressed air to more gently accelerate the shells and keep them from detonating in the breech? This was back when NG based explosives were the only high explosives known. _________________ It's never too late to have a happy childhood.   Posted: Wed Feb 08, 2012 10:52 am kodiakdan Member Joined: 13 Dec 2011 Posts: 46 Location: South Central Iowa Slavia wrote: Bob - as an airgunner, doesn't it give you a bit of a tingle to even contemplate the term "foot-tons"? Just as an aside, go to the satellite images on Google and look at Pearl Harbor. You can still see the oil plume leaking from the Arizona. Yep, still leaking. I got some pics of that too. You can smell it as well if youre there. Could smell it all the way over to the deck of the missouri too. They say it only leaks a small amount a day. At this time they plan on just letting it leak.   Posted: Thu Feb 09, 2012 7:43 pm MSEO Member Joined: 26 Nov 2011 Posts: 30 Slavia wrote: Even at 20 P.S.I. how long would it take to hand-pump the volume you would need? Well the volume of the barrel is 160,850 cubic inches or 93 cubic feet, if that helps.   Posted: Fri Feb 10, 2012 1:53 pm oddtodd Silver Status Member Joined: 30 Dec 2008 Posts: 2029 Location: Richmond, IN USA 93 cubic feet?!?!? I think it would take at least an hour or two. lol _________________ Airguns: Two starlings talking "Larry, did you hear that? Larry?? LARRY!!!!"   Posted: Fri Feb 10, 2012 2:28 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC Heck one blast from a SCUBA tank might be enough to have the shell dribble out the end (of a 50 x 16" = 800" barrel) and fall on the deck.... Actually, a shorter barrel would be more efficient at such low pressures and volumes.... If the barrel was "only" 10 feet, the volume would "only" be 14 CF.... An 80 CF SCUBA tank would produce a residual pressure of 83 psi at the muzzle.... enough to still be providing over 4G of acceleration.... (note, I'm still assuming 2000 lbs. of friction forces).... That assumes you could "dump" the whole 80 CF into the barrel quick enough to empty the tank before the shell reached the muzzle.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count! 2000 LB projectile velocity?     Air Gun Home Forum Index » The BS Topic 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." 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