Talk:Crash of Malaysia Airlines flight MH17/Forensics

Direction of projectiles?
In any Buk theory the shrapnel would have to come from one single direction or source. One attacking fighter would also produce "machine gun" fire from a single direction. Some people see both entry and exit holes in the same segment and thus claim that two different fighters attacked the plane. I believe that all the major holes can be explained by projectiles coming from one direction.

The direction of projectiles seems to be from the front, slightly to the left and slightly above, directed mainly at the captain's chair through the windshield. The projectiles left perfectly round holes of about 20 mm diameter in the upper frame of the port side windshield. Further down the left side the holes became elongated and irregular, some with the appearance of exit holes. The smaller irregular holes on the side are most likely the result of fragmentation rounds mixed in with armor piercing bullets. Some of these may have bounced off the side and exploded outside.

The same direction of the projectiles is also evident in this analysis of the hole in the cockpit roof / side pannel done by the Bellingcat team.


 * You reference the "Bellingcat team". Unless you can reference their source material with usable links and evidence of good provenance then such a reference is not useful in any way. Bellingcat is by self-description an agency of Eliot Higgins and uses a paywall to access material so no links are possible. Beyond that the reliability and objectivity of Eliot Higgins is very low. Can you provide original sources please. --Charles Wood (talk) 13:23, 10 August 2014 (UTC)
 * Oh, lighten up. Ideally, yes, all primary source, etc. But time gets short, the photos aren't fake, the analysis looks worth considering and bringing here. That side flap shallow penetration is useful to see. Unreliable? On political implications, yes. On physical photo-based stuff, not that I've noticed. --Caustic Logic (talk) 23:45, 10 August 2014 (UTC)

The damage to the left wingtip was most likely produced by debris from the cockpit section hitting the wing (as Charles already suggested). -- Petri Krohn (talk) 04:04, 6 August 2014 (UTC) Updated 08:43, 7 August 2014 (UTC)

Update on wing damage: After looking at the KLA902 wing damage I am more inclined to believe it was caused by a R-60 or similar air-to-air missile. It is not breaking Occam's razor to assume that a jet would use both the autocannon and missiles to bring down MH17 – in fact it would need to do so, if it was to guarantee the success of its mission. Also it is possible that the apparent blast damage and random shrapnel holes on the front port side is caused by a missile exploding and not the autocannon. For arguments sake we can dismiss this. Supporters of a Buk hypothesis can always argue other causes for the wing damage. -- Petri Krohn (talk) 08:20, 7 August 2014 (UTC)


 * The wing, okay - it happened while airborne, but it could well be that. I previously thought the left-side damage looked to have a from-behind trajectory. Looking again, it looked more straight in. Looking closer yet, as I show below, I think these holes come from forward, a bit above, and at a pretty oblique angle - obviously a bit to the left, but not much. In line with what you just said, Petri. (from left side, forward cockpit, just below the windscreen - detail from the high-res photo available here) --Caustic Logic (talk) 10:28, 6 August 2014 (UTC)


 * I was also just thinking how that ubiquitous graphic lining up the wing damage and the cockpit throws everyone off. We can whip up an antidote, right? Which images should you show me in review and let the reader follow along? --Caustic Logic (talk) 10:28, 6 August 2014 (UTC)


 * I note lots of small pockmarks on the photo above, which scratch but did not penetrate. At this location and angle, appear to indicate incoming blast. This cannot possibly come from a blast from the other side, and appear quite unlikely to come from later debris.

--Chingachgook (talk) 17:52, 10 August 2014 (UTC)
 * I'm not sure how to read these (and all the micro-physics, cratering stuff, over my head/no useable knowledge or instinct) ... the upper left hole especially shows melting, so there might be little globs of molten metal, if that matters. The bigger craters might just be liquefied marks from smaller (rod?) impacts, but the tiny ones I really have no good thoughts on. Could that be the molten sparks blowing back? Somehow, yes, this is from outside the plane, coming in at an oblique, downward angle, and/or from after affects of that. --Caustic Logic (talk) 08:58, 11 August 2014 (UTC)


 * Those pockmarks are consistent with incoming blast. I do not see how they can be consistent with splashed deposited melt: exit jet will have velocities in at least hundreds m/s out of surface (no smaller scale is around), and in fact may be considerably more. For somebody sitting on a plane, there is incoming wind of 0.8 Mach, however out-oh-hole-debris jet speed is at least not negligible on that scale (actually, most likely larger). So melted jet will fly away and not likely to turn around and come back on the surface head-on.  While pockmarks are spread pretty evenly and randomly, with no noticeably correlation to holes or downwind directions . (Also there is not that much melting, it appears, to go by). All that suggests that there was some sort of blast on the left side not too far from the cabin (and in the "Single Buk Theory" this does make large holes entrance holes; in other theories, who knows).

--Chingachgook (talk) 18:43, 11 August 2014 (UTC)

Effects of R-60 air-to-air missile on Boeing airliner?
Korean Air flight 902 is extremely relevant to the MH17 case: The plane was forced to land by damage from one R-60 missile There are striking similarities between the damage and those seen on MH17: -- Petri Krohn (talk) 17:57, 6 August 2014 (UTC)
 * The Korean Boeing – English Russia, June 3, 2008 (photos)
 * R-60 Missile Damage – DeepResource, 06 AUG 2014
 * Korean Air Lines Flight 902 – Wikipedia
 * Photos: 1, 2
 * 1) Four meters of left wingtip cut off
 * 2) A pattern of shrapnel damage on the side of the fuselage where the warhead exploded
 * 3) Large sections of the fuselage torn open

Hypothesis: If a missile approach plane from behind nearly horizontally, its wing has stealthy profile and may be not detected by its (or plane's) radar, thus not triggering proximity fuse well prior to clipping the wing. It really should go off at least 17 meters BEFORE what it considers target. (Does the warhead have a radar on it, or target is illuminated from elsewhere? In any case it is getting closer than it should be). --Chingachgook (talk) 18:14, 10 August 2014 (UTC)


 * The R-60 is infrared guided and will aim for the engines. Unlike MANPADs it has a proximity fuse (either radar of optical) and will blow up somewhere near the fuselage. It does not need a radar for guidance.
 * If a R-60 was used, it was most likely fired from the same direction as the cannon fire, i.e. front left. It should thus explode in front of the (left) wing and leave shrapnel marks on the front fuselage. In fact, I think there are shrapnel holes and blast damage consistent with R-60 in the side panels behind the cockpit. -- Petri Krohn (talk) 20:26, 10 August 2014 (UTC)

Air-to-air missile or 30 mm autocannon?
The damage will tell us it was an air-to-air missile with rod warhead fired from the front, that exploded when its proximity fuse passed the cockpit window. -- Petri Krohn (talk) 23:04, 28 July 2014 (UTC)


 * More specifically,I don't think the angle of impact can tell us anything. Maybe I was the only one that for a minute thought it could - if it scraped the top of the wing, it must've been fired from above the wing, behind and to the left. But it could have just leveled out there after flying up, turning, etc. Other clues are what they are - payload type and size, dynamics I don't know. I note Charles here said the damage looks less like a rod than regular shrapnel, if that matters. For my part, I'm suspecting Surface fired, partly because the people who should know (Kiev) keep saying that and claiming they can show you the exact launcher. Maybe they can and did. Maybe the jet was there to help explain why the separatists did it, and to observe, or something. --Caustic Logic (talk) 23:14, 29 July 2014 (UTC)
 * This analysis say it was a 30 mm autocannon. Maybe. (English summary + another) One thing is sure; it was not a Buk or fired from the surface. -- Petri Krohn (talk) 23:22, 29 July 2014 (UTC)
 * Russian analysis says it is not a Buk. -- Petri Krohn (talk) 23:36, 29 July 2014 (UTC)


 * Since that's what I suspect at the moment, some discussion should follow. Will check those links soon. --Caustic Logic (talk) 23:42, 29 July 2014 (UTC)


 * Effect of 25mm and 30mm cannon shells Gives an extremely good idea of what cannon shell damage looks like. I don't see any damage pattern on MH17 wreckage to match that. On the other hand the damage pattern from a proximity detonated shrapnel warhead is entirely consistent with the damage. E.g.


 * [[File:Shrapnel_sample.png]]


 * An expanding rod warhead is eliminated as there is no damage match. E.g.


 * [[File:Hobartdamage2.jpg]]


 * Damage to the left wingtip is variously being touted as an R60 air-to-air missile expanding rod strike or a 30mm cannon strike. It's not an expanding rod strike as it scrapes rather than penetrates the skin in a line. It also does not match a 30mm cannon strike as there is no detonation pattern and 30mm rounds don't 'bounce' as they skip along a wing surface. It's suggested that this damage is actually from later debris falling on the wing.


 * [[File:Wingtip_damage.png]]


 * --Charles Wood (talk) 03:39, 30 July 2014 (UTC)

Left Wing Damage
(copied from above to start this section) Damage to the left wingtip is variously being touted as an R60 air-to-air missile expanding rod strike or a 30mm cannon strike. It's not an expanding rod strike as it scrapes rather than penetrates the skin in a line. It also does not match a 30mm cannon strike as there is no detonation pattern and 30mm rounds don't 'bounce' as they skip along a wing surface. It's suggested that this damage is actually from later debris falling on the wing.


 * [[File:Wingtip_damage.png]]

--Charles Wood (talk) 03:39, 30 July 2014 (UTC)


 * Wing damage after/during crash: I thought that too on first look, but based on nothing. Since then I decided the irregularity of the windward edge of that tear suggests it was rippling with airflow as it was torn, so it was airborne at the moment, anyway. That's a lot of scattered, forceful, linear action lining up with the cockpit to be coincidental (brush damage?) - I think this is munitions damage. Another gouge I found interesting is a more likely mechanical cut from the plane falling apart after the attack. Seen closer up and seen in context (just southeast of picture's center) --Caustic Logic (talk) 09:58, 30 July 2014 (UTC)


 * Wing damage appears consistent with projectiles moving towards the plane, not away from the plane.
 * Depressions are towards the wing back edge, glancing scrapes are towards the front. If motion is away from plane, there is no escape root from the depressed part. Thus I feel hit is coming from the back-left, moving towards the pilot cabin. This appear to contradict an assumption of front-to-back hit (but not the overall conclusion)  made by a Buk expert.
 * Agreed that some of the damage towards the wing front appear to be due to incoming air drag. Such drag, subsequent chaotic fall, may explain why wreckage is not aligned with the plane course.
 * Very unlikely that damage is not due to a projectile of some sort at all: a lot of relative speed and glancing blow. --Chingachgook (talk) 22:21, 9 August 2014 (UTC)


 * Hey, I think I get what you're saying, agreeing with what I said. But since then, it's come to appear the blast/attack (if only one) was from the front and this wing damage is coincidental. I still thenk it was while airborne, but there was some breakup then. Direction, I'm not sure. It should be away from the plane, if it's plane fragments that scraped across here. It seems like the forward part is what came apart early on, and any piece of it could cut the wing open as it nose-dived past the chunk with less mass and more drag. So, I can/have seen it both ways. --Caustic Logic (talk) 23:42, 9 August 2014 (UTC)


 * It was, kind of, similar to stone skipping. I expect smoother, more shallow part of the dent to point in the direction of the motion, that is towards the plane as detailed dent photos suggest. Should not be difficult to do experiment, sand or something, to confirm. This also suggests nearly horizontal impact angle. (All of that does not look consistent with front or right- fired Buk) --Chingachgook (talk) 05:14, 10 August 2014 (UTC)


 * I come from 2 other sites looking at the forensics (not politics) of this crash. We have not liked the "rod scrape" idea for this damage. Have you considered it may be from other debris? specifically, parts of the engine cowling?  this was shot off in the initial attack (whatever that was). One part of it was found at Petropavilvka, and engine fan blade pieces elsewhere, well before the final impact. Such a piece could skid across the wing at a flat angle like this. KatKan (talk) 20:12, 13 August 2014 (UTC)


 * The engine is under the wing, so it seems unliklely. As Petri and CHarles suspected, and now me too, a piece from forward of the wing and maybe above, not right under. The forward fuselage, cockpit area, anything from the front falling off and back, with drag as the rest of the plane continued past, would cause this. --Caustic Logic (talk) 22:04, 13 August 2014 (UTC)


 * We have not, really. Source of cowling damage is unclear but seems independent from the wing damage.  It looks that wing damage has to do with shrapnel of some sort, rather than secondary  debris (it is not downwind, and A LOT so, thus it is fast; and also it is pretty solid). If it hits the MH17 engine fan, that will indeed create very violent debris, and go everywhere it can get on a straight path (there will be little little out there to stop it), and predominantly  downstream.  This is  not likely to give glancing blows to the top of the wing though, no such straight paths.  There are cases of blown fans recorded, it can be looked up. Some blows to the body, mostly  downstream or near engine, as far as I can recall. Most planes survive blown fans, but with damage often to wings, they will be often crashing. So in short, engine and wing top appear pretty independent issues.


 * Direction of wing damage may be EXTREMELY important for overall conclusion.  I keep saying that it is more consistent with moving towards the cabin than away from the cabin based on traces it made, as it is too rough on back of those dents and very smooth on front.  Exactly what it was flying, would really need more than just looking at photographs to be  sure. --Chingachgook (talk) 22:57, 13 August 2014 (UTC)

Warhead damage
Financial Times clames their photo shows BUK type shrapnel damage. I do not quite agree. The 70 kg warhead should produce larger damage. All warheads – even rod warheads – produce some shrapnel. -- Petri Krohn (talk) 08:13, 22 July 2014 (UTC)
 * MH17 crash: FT photo shows signs of damage from missile strike – July 21, 2014


 * FYI - the aircraft panel in the link image is the left-hand cockpit wall and the start of the lefthand windscreen at the top. That's where the Captain sits. I doubt he survived the initial engagement.


 * Also interesting is the latest 'leaked' US intelligence map showing the missile launched from right of track and curling around to attack the left. A bit of a stretch to fit a theory?
 * --Charles Wood (talk) 01:07, 23 July 2014 (UTC)


 * This image shows cockpit seat rails and rear centre consul. Note at bottom what appears to be RH / first officers windscreen frame with shrapnel egress.


 * https://secure.flickr.com/photos/jer...7595/lightbox/
 * https://www.flickr.com/photos/jeroen...ream/lightbox/


 * same windscreen from different angle amongst plant. *note what appears to be shrapnel damage to pilots seat back just below top inertia reel.


 * https://secure.flickr.com/photos/jer...7595/lightbox/


 * Combined with ingress damage on PIC side, the shrapnel will have taken out both aircrew instantly
 * --Charles Wood (talk) 03:57, 23 July 2014 (UTC)
 * Your photo links are broken. Are they from the same photoset? I do not see any cockpit parts in the same set with the tail section photos. There is another set here and even more damage photos here. Still don't know what photos you are referring to. Evidently this cockpit explosion did not disintegrate the whole front section of the fuselage, as the BUK warhead would have done, if it exploded near the cockpit. Photos I have seen show the intrument panel without any shrapnel damage, with glass broken by the impact on the ground.
 * If the missiles were fired from the Su-25, then most likely multiple missiles would have been launched. If only one missile was used, as would be the case with the BUK then the "rod" damage to the upper side of the left wing would have to come from the same explosion. If you follow the lines in the drawing here then the explosion would have to be very near the fuselage. This makes me believe a small air-to-air warhead was used.
 * Can you identify where the other body panel with blast damage is from?
 * P.S. – Strelkov noted that there was blood in the cockpit but the passengers were "lifeless" and bloodless. This would be explained, if the pilots were killed by shrapnel and the passengers by loss of cabin pressure at 33,000 feet. -- Petri Krohn (talk) 11:07, 23 July 2014 (UTC)


 * The links worked when I posted them. Odd. They were jeroenakkermans images of the cockpit area. A big heap of wreckage with keyboards etc visible. I can only affirm they showed some cockpit skin and pilot seat amongst many other items and it was clear there was damage in from left and out through right when looking at identifiable parts. Will search the image archive later.

--Charles Wood (talk) 12:17, 23 July 2014 (UTC)


 * Note: broken here too. Might be around in a diff. posting, etc. I'm looking a little at the images that are here but not enough to say anything yet - I'm convinced it's well worth doing and things can be figured out - will catch up in time. --Caustic Logic (talk) 12:28, 23 July 2014 (UTC)


 * This one shows Right-hand cockpit window at bottom of screen. All photos in this group are cockpit remnants--Charles Wood (talk) 20:25, 23 July 2014 (UTC)

These photographs show clear rod warhead damage to left wing. -- Petri Krohn (talk) 08:13, 22 July 2014 (UTC)
 * Scenes of MH17 20-7-2014 – Jeroen Akkermans RTL News Berlin


 * Wreckage Offers Clues on Why Flight 17 Went Down – New York Times, July 21, 2014
 * ''Photographs of a piece of wreckage found by two reporters for The New York Times and analyzed by Reed Foster, a defense analyst with IHS Jane’s, offer some clues about what could have caused Malaysia Airlines Flight 17 to crash. While it is impossible from the photographs to determine that a specific missile was used, Mr. Foster said, the damage is consistent with the effects of a fragmentary warhead carried by an SA-11, the type of missile that American officials have said was most likely behind the attack.


 * Weasel words to note: impossible to tell what missile (correct, makes you seem balanced) It's consistent with many types of missile, therefore. But they only say "consistent with ... the type of missile that American officials have said" is part of the tragedy "made in Moscow" as they say. In between, the most loaded and likely relevant specifics right in elipses there, to make that one consistent missile type sound like the most technically likely, boosting the gov. call, in turn boosting the "confirmation," etc. Bad weasels.--Caustic Logic (talk) 12:28, 23 July 2014 (UTC)


 * Does MH17 wreckage prove that it was shot out the sky by a warhead? – Daily Mail, 22 July 2014
 * The photos show the critical piece with blast damage and "shrapnel" holes. I think it proves exactly the opposite to what the Daily Mail is claiming. The 70 kg BUK warhead would have done much serious damage. This piece seem to be torn off by a rod warhead of a air-to-air missile. -- Petri Krohn (talk) 22:38, 22 July 2014 (UTC)



Very peculiar shrapnel direction (so it can chase the plane and totally bang off pilot cabin, and have a lot of its other potential wasted? ) Do front and side cones go off simultaneously or with a delay? Don't know what captions say, why is frontal cone shown lighter than side cone? --Chingachgook (talk) 03:37, 12 August 2014 (UTC)

"Bukin anti-aircraft missile warhead open source is slightly conflicting information. Presumably, the 70 kg at the forefront of the battle of the cylindrical explosive charge on the long sides is either esisirpaloitu tubular sheath or layer of spherical or cube shard elements. Herätesytyttimen Normal setting is 17 meters away from. Sirpalekuvio is the main missile transverse to the longitudinal direction of the expanding sector of a front view of the expandable cage. Battle of the tip located in the front of the missile parts create its direction of travel according to sirpalesektorin and other structures formed by missile fragments are spread randomly" Reference

Type of Warhead
The main page links offsite to an article about 'rod' damage to the aircraft.

The damage pattern is not 'rod' i.e. expanding rod - which is a linear set of damage in a single plane, often contiguous. Instead it's a typical shrapnel pattern, possibly slightly directional. This sets the type of warhead used and possibly even the missile type - assuming it was a BUK launcher. --Charles Wood (talk) 21:25, 28 July 2014 (UTC)

Not a Buk?
Responding to Petri's non-BUK analysis links: the German analysis - the second guy sounds fishy. Most of the damage looks too irregular to be bullet holes. But then some of them, especially on the left here, do look consistent to me. I'm no weapons expert. It's possible it was hit with two different things at different times. (image below is huge - full size in new window gives some great detail) --Caustic Logic (talk) 09:49, 30 July 2014 (UTC)

Okay, the Russian analysis - Google translated: "The probability that a passenger plane was shot down by a missile fired from "Buka", is negligible, said Maj. Gen. Cruz in an interview with "Military-Industrial Courier."
 * "All openings of submunitions on the paneling" Boeing "suggests that undermining warhead was done bottom-side. But our "Bukovskaya" missile hit the top, making the "hill" in front of goal. That is the only way, not the other way "- says Cruz. 
 * Is that him thinking like I was for a minute, that it must have been first fired from above, because of the wing damage? He also points to a smoke trail that should be visible for a BUK missile when there isn't (worth looking into) and he thinks they'd need more training than they had, while showing no sign of knowing how much training the relevant people had. Not too impressed with "Cruz." --Caustic Logic (talk) 09:49, 30 July 2014 (UTC)


 * If a missile is aimed above the target, then obviously it will hit it from above. But if it is aimed below it is not going to go above it by itself, so that statement is useless. At most it shows Russian best practice,not a characteristic of the missile itself. --KatKan (talk) 20:27, 13 August 2014 (UTC)


 * Looks lie he is saying that navigation/control always tries to put it on top. But that does not mean it always deliver. Good to know, I guess.  --Chingachgook (talk) 23:10, 13 August 2014 (UTC)

The damage could not be from above, because where are the holes on the top? NOWHERE. Even in the cockpit area, there is nothing above the top of the windows, but there ARE holes in the cockpit floor. Further there back there are 5 small holes on the fuselage roof,which might be from inside out. The front door is missing, so we can't tell about that. There was damage to the port engine, deep in, where the fan is, as parts of blade have been found well ahead of the impact area. The blast seems to be from just a little underneath, at a very flat angle. KatKan (talk) 20:27, 13 August 2014 (UTC)

I agree, it looks as if was hit with two different things. It is not possible that this happened at different times. The "two different things" can be explained by a mixture of armor-piercings and fragmentation ammo. (This is I suppose what a Su-25 would normally carry when attacking tank columns.) The real problem here is that I do not really know if these are exit or entry holes. I see some blast damage on the outside. The "cockpit roof / side panel" piece seems to show soot and slight buckling caused by an explosion on the outside. How long would it take for the frags to explode after passing through the aluminium skin?

Adam, could you create a stereoscopic image of the holes? Take two images of the same area, scale and cut them to exactly the same size. Two .jpg images would be good to flip-flop between. Maybe a flashing .gif for social media. -- Petri Krohn (talk) 13:23, 30 July 2014 (UTC)
 * Hm, maybe. Never tried that, they'll be at different angles, etc. Explain in e-mail. I'm slow today. --Caustic Logic (talk) 22:16, 30 July 2014 (UTC)


 * You need to be aware the panel has two different metals above and below the join line. The upper material is in immediate proximity to the windows and is much thicker and stronger - probably titanium. The lower material is Aluminum alloy - perhaps 80 - 160 thou thick. The splash pattern on the thicker/stronger material at the top is characteristic of high velocity impact in strong materials with subsequent cratering. The lower damage is characteristic of particles punching their way through thin metal with little or zero cratering effect.
 * --Charles Wood (talk) 14:20, 30 July 2014 (UTC)
 * Would this cratering be visible on the ingress or egress side? Or both? I would expect the the patterns to have radial structure, but they all seem to be tilted the same way. -- Petri Krohn (talk) 15:13, 30 July 2014 (UTC)

Shrapnel Fragment Size
I'm not sure this is the same warhead we'd be looking for, but likely - if the SA-11 has one type of warhead, this is probably it. Charles posted this photo of an unexploded SA-11 warhead, plus on another area (further detail yet, below). Where/when the photos are from, not sure, but they are the main feature in an August 2014 report by Richard M. Lloyd, available here. He thinks this is an SA-11 warhead, apparently the only one, and thus a clue to the MH17 case. He compares this with schematics to show it's the right size (you'd think he could have more definitive sources...) If the overall rocket is 5.5 meters long and .4 meters at the widest, the warhead area must be (about) 8 inches/ 20 cm in diameter at most, and thus maybe 12 inches/30 cm long? From there, I put the section with frags about to scale on the other image (it involves flipping one). At full resolution, it seems the big photo is about 150% life-size (the warhead measures about 12" by 18" on-screen), so the 3.75" exposed portion is about 2.5" real-life, if I scaled it right. If so, there are five rows of fragments, so they should be about a half-inch square (on-screen: app. .75" each) or about 13 mm - to holes in the hull measured as around 20 mm. This might be significantly off - it was a first try. And, considering the 3-D aspect, the final hole would be bigger than 13 mm, depending on the angle.--Caustic Logic (talk) 07:02, 10 August 2014 (UTC)

Cratering and hole size
In impacts where there is significant surface depth, relative surface hardness, and high impact velocity you get a neat cratering effect that is similar to moon craters and splashes in water. The shape of the impactor is mostly lost and all that remains is a fairly symmetrical round impact crater.

It's not in the least unreasonable that a ~13mm irregular impactor into thick titanium produces an ~ 20mm circular crater - whether or not it actualy penetrates.

It's only when the surface is very thin and soft that cratering disappears and shape punching occurs. Of course this all depends on impact velocity. There will be a whole spectrum of shapes from simple indented punch marks to nice round craters blasting back in approx the direction the impactor came from (though mostly orthogonal to the surface) --Charles Wood (talk) 07:18, 10 August 2014 (UTC)


 * It indeed may have some similarities to cratering. (However, my understanding is that "classical" cratering assumes projectile velocity higher than material speed of sound (also deep material -no exit). Aluminum speed of sound is maybe 3000 m/s or more, above Mach 10 in the air. Most likely, projectile speed is less than that, so for impacted material it is likely "subsonic"--less than assumed in classical cratering). --Chingachgook (talk) 12:55, 10 August 2014 (UTC)


 * That's simply not true. You can get 'cratering' in water by lobbing a stone into it at some tiny fraction of the speed of sound in water.


 * Cratering in metal is a complex interaction of solid, plastic, and liquid response with localised phase-change depending on impact energy. Essentially the impactor changes the local phase of the metal due energy release, and the bulk physical properties of the material and impactor may then produce a 'splash'. Nothing to do with the prior bulk material speed of sound. --Charles Wood (talk) 13:07, 10 August 2014 (UTC)


 * I agree with all that, still in deep material moving faster or slower than sound in material propagates makes a difference to those complicated details.
 * Craters on planets we observe are from supersonic events. Over here we most likely have it "subsonic". --Chingachgook (talk) 13:36, 10 August 2014 (UTC)


 * State of knowledge here is likely what's known about relationship of entry size and caliber for bullets. I am not aware of good references, here is some It is complicated, may be bigger than caliber, but likely not much bigger. For "supersonic" entry, expect more outside damage (shock wave). --Chingachgook (talk) 14:41, 10 August 2014 (UTC)


 * Sounds reasonable to me. Also to note, if this device was used, I see little clumping happening. Little blocks and littler rods, all distinct, for consistent sized holes - 2 main sizes. Is that consistent with what we see? --Caustic Logic (talk) 08:20, 10 August 2014 (UTC)


 * My understanding of the warhead shrapnel is that it is in two layers and in each layer it tesselates two basic designs of different sizes - a larger butterfly pattern and a smaller diamond/cubish pattern (memory may be faulty so check) --Charles Wood (talk) 08:25, 10 August 2014 (UTC)
 * yes, you can see the smaller ones in that picture, to the left. So there will be at least three types of fragments involved. The block ones seen biggest, and I think they would come out making the bigger holes of about 20 mm. 13 mm square (again, rough) would have a diagonal of about 18 mm, a better measure, and depending on thickness, a 3-D diagonal of about 20-22 (? no real math there, until there's firmer numbers to work with anyway). --Caustic Logic (talk) 12:13, 12 August 2014 (UTC)

Interception Location

 * ''Moved to Talk:Crash of Malaysia Airlines flight MH17/Map

Questions Raised

 * ''Moved to Talk:Crash of Malaysia Airlines flight MH17