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| IL-2 Sturmovik The famous combat flight simulator. |
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#1
12-07-2010, 09:15 PM
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Your standard hand grenade is built to limit the effective radius of the fragments or else it would kill the user too often.
http://www.fas.org/man/dod-101/sys/land/m61.htm See that fragmentation coil there. It is limiting the fragment killing radius to few meters. Here is some calculation for the same grenade in ideal conditions without the fragmentation coil. 185g of Comp-B should be enough to give 2g fragment 480m/s speed at 100m. http://www.fas.org/man/dod-101/navy/...s/Warheads.htm Flanker since you've calculate these before then could you perhaps calculate the same thing with 2500g and 300m If you still after calculating it say that 2500g of explosives cannot deliver deadly fragment to 300m, next step is to take this to Mythbusters.  Some more interesting reading: http://www.fas.org/man/dod-101/sys/dumb/bombs.htm Blast is caused by tremendous dynamic overpressures generated by the detonation of a high explosive. Complete (high order) detonation of high-explosives can generate pressures up to 700 tons per square inch and temperatures in the range of 3,000 to 4,500º prior to bomb case fragmentation. It is essential that the bomb casing remain intact long enough after the detonation sequence begins to contain the hot gases and achieve a high order explosion. A consideration when striking hardened targets is that deformation of the weapon casing or fuze may cause the warhead to dud or experience a low order detonation. Approximately half of the total energy generated will be used in swelling the bomb casing to 1.5 times its normal size prior to fragmenting and then imparting velocity to those fragments. The remainder of this energy is expended in compression of the air surrounding the bomb and is responsible for the blast effect. This effect is most desirable for attacking walls, collapsing roofs, and destroying or damaging machinery. The effect of blast on personnel is confined to a relatively short distance (110 feet for a 2000 pound bomb). For surface targets blast is maximized by using a general purpose (GP) bomb with an instantaneous fuzing system that will produce a surface burst with little or no confinement of the overpressures generated by excessive burial. For buildings or bunkers the use of a delayed fuzing system allows the blast to occur within the structure maximizing the damage caused by the explosion. Fragmentation is caused by the break-up of the weapon casing upon detonation. Fragments of a bomb case can achieve velocities from 3,000 to 11,000 fps depending on the type of bomb (for example GP bomb fragments have velocities of 5,000 to 9,000 fps). Fragmentation is effective against troops, vehicles, aircraft and other soft targets. The fragmentation effects generated from the detonation of a high-explosive bomb have greater effective range than blast, usually up to approximately 3,000 feet regardless of bomb size. The fragmentation effect can be maximized by using a bomb specifically designed for this effect, or by using a GP bomb with an airburst functioning fuze. http://www.scribd.com/doc/35978019/T...-December-1943 "SC designates a thin wall high-explosive bomb, achieves its effect chiefly by blast."
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#2
12-07-2010, 11:29 PM
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All this data is a smoke screen that doesn't explain the huge differences in the blast radius of relatively similar bombs, i.e Fab 1000 vs SC1000
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Win 7/64 Ult.; Phenom II X6 1100T; ASUS Crosshair IV; 16 GB DDR3/1600 Corsair; ASUS EAH6950/2GB; Logitech G940 & the usual suspects  |
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#3
12-07-2010, 11:51 PM
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This reminds me of the Iraqi military communication officer who denied the presence of the American forces having penetrated Baghdad when you could clearly see behind him the advancing America forces.
If it walks like a duck, quacks like a duck and looks like a duck it is probably a duck. There have been numerous flight model error brought out by experienced individuals on many occasions. The most notable for me is a statement by a P-38 driver (in the book "Fork-Tailed Devil: The P-38" written by Martin Caidin) that states he could out turn a 109. No way you're going to do that in the game. I also find it rather ironic the condescending attitude towards "Moders". Consider the roots of TD. One needs to recognize the type of "Moder" that we have in IL-2 versus other arcade games. The Moder for IL-2 tends to be historically motivated and not out to simply create a "cheat". |
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#4
12-08-2010, 01:40 AM
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Fragments can kill if they hit, and if they are fast enough and heavy enough.
The probability of that for a bomb depends upon the size of the fragment and the range. If the fragment is very small, it will run out of kinetic energy before it gets too far from the bomb. If the fragment is large, then for a given size of bomb, there will be fewer fragments than with smaller fragments. A hand grenade can kill out to 60yards. With 36? fragments in one grenade, you have to be pretty unlucky to get hit at 60yards. |
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#7
12-08-2010, 01:52 AM
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Quote:
Your link to the Gurney equation covers the fragmentation part of the picture theoretically but note that the calc is per fragment, and there are a lot of 2g fragments in a fragmentation coil. The 5m statistic is just that; it is probable that enough frags will hit you to kill you at under 5m, injure you badly at under 15m, but might injure you to some degree a lot further out than that. Last time I threw a hand grenade I put something solid between me and the bang. Much safer than statistics.. The Gurney equation doesn't cover blast effect. |
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#8
12-08-2010, 06:06 AM
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S!
I brought up this thread with fellow EOD/armament personnel at work, showing replies of TD regarding bombs. Verdict: stop talking about things you know a squat of. After looking at the radiuses in IL-2 questions were: what is this based on? How do you define destruction range? What damage is considered? Which formula was used to get such results, what parameters are taken into consideration..and many more. You might know the inner works of IL-2 etc. but seemingly there is not a single guy in the team knowing more than theoretical things, nothing about RL application of explosives. Or am I wrong? In IL-2 the bombs of ALL nations could use a closer check to determine how they are modelled. This has nothing to do with blue or red, I am beyond that crap. If there is an error or discrenpacy in data then a check is not a bad thing..I think no-one would disagree with that? I rest my case here. It is useless to argue. |
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#9
12-08-2010, 07:47 AM
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Quote:
Fully agreed. It is a question of credibility. I think that this "problem" could be fixed very quickly, if data are available. |
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#10
12-08-2010, 11:23 AM
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As i mentioned in my original reply i understand the problems about changing values because of the gigantic task it is to go through 2000-2500 models of ww2 bombs...
My problem is that my english dont cover what i want to say and therefore i have to with draw from the discution..... All i can say that i know is clear is that a bomb is not only about fragments, it is more complicatet than that. I wish i had the English to make my point... Im a "fan" of TD and in general im am happy with the work they do and i will rest my case with that. Maby in one or two years my English have improved enough lol... Catch a great day all.... LTbear |
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