Sanku wrote:Such "nearly equally good" comments are thorough junk mean nothing frankly.
Oh , indeed, so reality intrudes very rudely indeed into your make believe world , and trashes your "oh.. must have significant loss due to rotational kinetic energy.. because I think so"..
Why this is perfectly on the lines of what.. 1650m/s from rifled gun, it
MUST be 1900 m/s from smoothbore then , reality be damned kind of shanghai stat and madrassa math in support of Lahori logic!
So is harping on a slip ring as if it is great invention. Slip rings have been around since 1940s, when it was first discovered that spinning mutions had issues in various contexts (reading up on it is trivial)
It must be equally trivial to note then, that it is extremely simple , cheap , effective from the same sources. So why then, Maharaj Ji, if your "Knowlijj" was so profound that a whole series of your ilk, yellow journalists, Natashas and a whole troop of Uniformed Harrumphs, go on and on about..oh.. rifled gun, obsolete, CANNOT fire APFSDS, cannot fire missile. Maybe, once you are "ejjucated", you can go back and rewrite what you wrote ?
The point is simple, is the slip ring 100% perfect (that is NO spin is imparted to the round) or not.
Maharaj Ji, you probably dont play tennis to appreciate top spin, but surely you ride a bicycle, why dont you sit in a bicycle and crank the pedal
BACKWARDS , see how far you go and then decide whether the slip ring mechanism there works 100% perfectly or not ? Simple no? Even a kid can do it.
Obviously any mechanical system can not ensure 100% decoupling, I will leave it as an exercise of those who think (1650 == 1750 == 1900) to actually find out what is the efficiency of a slip ring in practice and how much of spin it isolates, and how much it passes on.
Translated in Inglees, it means
YOU have zero ability to do the exercise, cant even get your arms around it and have no clue how to do it,cant deal with real world data and facts and expect, data to fit your pre conceived world views (oh.. it MUST be 1900m/s then..
)!
Vina is butchering basic physics and engineering here.
Indeed. So are a lot of others who actually seem to be doing it for a living and funnily enough their butchering works, but Maharaj's Hawaa-bazi is just that.
Ask Unkal Googal the Qustion "Slip Band Obturator" and the first hit that pops up is a pdf link titled Branch Name . Click on "Quick View" , not on the link(which doesn't work) and you get to see a presentation titled "Composite Sabot Technology for 105mm Gun System" by a person with Ultra-Ultra SDRE name called Velan Mudaliar (gosh.. if he was wearing his dhoti , he would be in the DRDO), of the US Army - Armament Research,Development and Engg Center, Picatinny Arsenal.. dont worry, it is Unclassified , no FBI spooks are going to show up at your door step, published Aug 2011.
Oh, yeah, they are doing engg development on the self same 105mm RIFLED gun (the Royal Ordnance L7, that was made in India as well) as of 2011 , so not "obsolete" by any stretch, and in fact,present on the latest armored vehicle in the US inventory and horror or horrors, just like the Arjun, that is a unitary round with slip band obturator (oh.. the Bangle is against all laws of Physics.. Maharaj Harrumphed earlier.. must be make believe Maharaj Fyzzics I am sure), and in that presentation in the slide titled "Torque in 105 mm gun system" , there are three very interesting graphs, that has prediction models on the torque from band slip, time histories of spin rate and pressure. The torque graph is incredibly interesting..
Let us see Maharaj's "spin" (pun intended) on that and his ability on getting data and trends on graphs,how it will translate in the real world, how it squares ith his experience in sitting and pedaling his bicycle backwards and how it tallies with this particular application of the spinning band! It will be interesting to hear it !
And if anyone thinks that it must all be so "incredibly expensive" look at this
Link for M242 Auto Cannon and scroll down to M919- Armor piercing FSAPDS-T, which like the Arjun's is also a fin stabilized round, fired from a rifled gun, it has a NYLON obturating slip band (oopps.. Maharaj need to take of lot more grams out of the moment of inertia calculations from an already low base..
) and is listed as $98 , and mind you, this is a DU round!