Damian90 Posted May 2, 2014 Share Posted May 2, 2014 However older Rh120/L44 guns during modernization of whole Leopard 2 tanks, require some upgrades and modifications (mostly to recoil mechanism) to be capable to fire more modern rounds like DM53.As for Soviet guns, AFAIK these are L48 not L52. 0 Quote Link to comment Share on other sites More sharing options...
lavictoireestlavie Posted May 2, 2014 Share Posted May 2, 2014 AGT1500 Here:Gross torque at 3000 rpm NBC on-2561 lb-ft NBC off-2626 lb-ft Maximum torque at 1500 rpm NBC on-3842 lb-ft NBC off-3885 lb-ft=5267.35273575 Nm Response Transient, idle to 90% rated power 4 sec Power decay, 100 to 20% power 5 sec dta delta, thanks for the info 0 Quote Link to comment Share on other sites More sharing options...
Gibsonm Posted May 2, 2014 Share Posted May 2, 2014 Aaaaaaaaaaargh! But thank you for the information. So I guess the only thing to do is to make a note of the official designation of the gun and look up the exact spec somewhere? Its more a question of context. The "Royal Ordnance L7 105mm" is a reference to the legendary tank gun, hopefully it would be pretty clear that the gun barrel was longer than "L7" (7 x 105mm = 735mm). Its just another case of jargon (all sorts, not just military) being situationaly dependent. 0 Quote Link to comment Share on other sites More sharing options...
Damian90 Posted May 2, 2014 Share Posted May 2, 2014 Interesting thing about L7 tough.The US M68 gun is mostly reffered as US version of L7 gun. However in reality it is a hybrid gun, breach assembly is from experimental T254E2 gun designed in US, which had interchangable barrel with British X15E8 which was L7 prototype designation.So M68 is T254E2 breach with X15E8 barrel. The reason why X15E8 barrel was choosen is because of bore evacuator position, that on T254E2 barrel was concentric, while X15E8 had eccentric thus it permitted greated gun depression. 0 Quote Link to comment Share on other sites More sharing options...
Tjay Posted May 2, 2014 Share Posted May 2, 2014 [quote name=Gibsonm;258324The "Royal Ordnance L7 105mm" is a reference to the legendary tank gun' date=' hopefully it would be pretty clear that the gun barrel was longer than "L7" (7 x 105mm = 735mm). Oh. I thought it might have been a carbine version. :clin: 0 Quote Link to comment Share on other sites More sharing options...
Sovngard Posted May 3, 2014 Share Posted May 3, 2014 dta delta, thanks for the info Don't waste your time on answering to comments written by fanboys. 0 Quote Link to comment Share on other sites More sharing options...
Grenny Posted May 3, 2014 Share Posted May 3, 2014 Don't waste your time on answering to comments written by fanboys. Hehe.." can engage a target the size of a football from 3 miles away". :-D Of course you can engage it, question is: can engage successful :-P 0 Quote Link to comment Share on other sites More sharing options...
DarkLabor Posted May 3, 2014 Share Posted May 3, 2014 Of course you can engage it, question is: can engage successful :-P Depends on the scale of that said football! 0 Quote Link to comment Share on other sites More sharing options...
Grenny Posted May 4, 2014 Share Posted May 4, 2014 Depends on the scale of that said football! Well, a safe is significantly smaller then an AFV, so 3 misses at 900m ...8-) 0 Quote Link to comment Share on other sites More sharing options...
DarkLabor Posted May 4, 2014 Share Posted May 4, 2014 Well, a safe is significantly smaller then an AFV, so 3 misses at 900m ...8-)...wich is bigger than a football @4828m. :icon_frown:The ball (~220mm in diameter) @4828m represents 4,55 x 10^(-2) mils.The safe (~1m by 0,5m) @900m represents 1,11mils by 0,56 mils.The commentator should have said the Challenger 2 should be able to engage targets the size of soccer field's central circle (~1,24 mils @4828m) from 3 mils aways. :wink: 0 Quote Link to comment Share on other sites More sharing options...
CR2_Commander Posted May 6, 2014 Share Posted May 6, 2014 so you haveL28 penetrator with a length of 650mm mv of 1670m/s = 510mm p0 in SB.compared to:M829 penetrator with a length of 500mm mv 1670m/s = 600mm p0 in SB.nothing to see here, move along...How much more penetration would be likely if the L28 mv was closer to 1845m/s? I don't have a clue about such magic and fairy dust. 0 Quote Link to comment Share on other sites More sharing options...
Moderators Volcano Posted May 6, 2014 Moderators Share Posted May 6, 2014 How much more penetration would be likely if the L28 mv was closer to 1845m/s? I don't have a clue about such magic and fairy dust.FWIW, we are in the process of gathering more data about the L28, and by extension, the L30, at the moment. It will take some time but we are trying to be very thorough. :bigsmile: 0 Quote Link to comment Share on other sites More sharing options...
hoggydog Posted May 6, 2014 Share Posted May 6, 2014 How much more penetration would be likely if the L28 mv was closer to 1845m/s? I don't have a clue about such magic and fairy dust. 1845m/s??? Is that just a figure you plucked out of 'thin air' CR2 0 Quote Link to comment Share on other sites More sharing options...
GSprocket Posted May 6, 2014 Share Posted May 6, 2014 It doesn't seem credible for a 'war-round'. 95m/s faster than DM53, fired from a rifled barrel of similar length.(This is *more* than the difference between L44 and L55 barrels firing DM53 (~80m/s)).It is conceivable that a long-range 'prac' round might use such a high V0 to "match" distant trajectories with a much lighter round that decelerates faster, but there would be a significant cost in wear.Even if this fantastic velocity were accepted, it would increase penetration only by ~10% over the assumed value at 'around' ~1670m/s. 0 Quote Link to comment Share on other sites More sharing options...
Members Ssnake Posted May 7, 2014 Members Share Posted May 7, 2014 How much more penetration would be likely if the L28 mv was closer to 1845m/s? I don't have a clue about such magic and fairy dust.There's neither magic nor fairy dust involved. We're engineers.Steel Beasts uses the Lanz-Odermatt equation to determine the initial perforation limit for a projectile striking at a given velocity (and we're fitting the air drag parameters to match the firing tables out to practical engagement ranges (so in the case of APFSDS rounds it'll work reasonably accurate out to two or three times that range, and I think that we're deleting non-artillery rounds at 10,000m to save computation time).So, if you happen to know the necessary parameters a variation of the impact velocity will quickly reveal how much of an effect this has. Unfortunately, knowing "the necessary parameters" is notoriously difficult since the exact figures are usually secret. So you have to work with estimates. Sometimes it's easier, in the case of the L27/L28 it has turned out to be more of a challenge. I'm confident that we'll tackle this one, sooner or later. 0 Quote Link to comment Share on other sites More sharing options...
Agiel Posted May 7, 2014 Share Posted May 7, 2014 Was your research also informed by what was known about the L11A5 used by the Chieftain and the Challenger 1? Though I acknowledge that its within the realm of possibility that the same round fired from an L11 and a the L30 would be like going from the L/44 to the L/55 using the same round, but I'm curious about the performance figures for the older gun. 0 Quote Link to comment Share on other sites More sharing options...
Grenny Posted May 7, 2014 Share Posted May 7, 2014 Try that one:http://www.longrods.ch/process.phpthey even have some nice "calculators" 0 Quote Link to comment Share on other sites More sharing options...
Rotareneg Posted May 7, 2014 Share Posted May 7, 2014 ... I think that we're deleting non-artillery rounds at 10,000m to save computation time).It's be a while since I checked, but back when SB 3 came out me and dta delta tried to find out how far out we could hit targets, and he won with a 21870 meter kill from a Leo 2E with DM53 rounds: http://www.steelbeasts.com/sbforums/showthread.php?t=20038&highlight=range&page=7 0 Quote Link to comment Share on other sites More sharing options...
Members Ssnake Posted May 7, 2014 Members Share Posted May 7, 2014 Okay. So maybe the limit got lifted for all rounds. Although I have to say that we don't vouch for accurate ballistics beyond the first six or seven kilometers range for non-artillery rounds.Not that I think you expected that, just sayin'... 0 Quote Link to comment Share on other sites More sharing options...
Rotareneg Posted May 7, 2014 Share Posted May 7, 2014 Awww, I guess that means no 1st Armored depleted uranium Lawn Jart division... 0 Quote Link to comment Share on other sites More sharing options...
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