Nadrek
WARNING: This post contains technical weapons discussion, including basic physics. If that's not your cup of tea, please move down to '} v3a comments:', at the end.
>>>[Okay.
>>>[Should I make it clearer and say the limits of man-portable gunpowder technology?
}Probably not - the Russian assassins carry what I would consider a vehicular level weapon (destroying entire rooms inside buildings), but don't appear to think on those levels. Another argument for them being NKVD/KGB, and not military (well, maybe GRU) - they're assassins, not soldiers.
[Well they were military. So that may not work.
>>>[And Morgan's gun is a stronger barrel and an increased strength to the 25mm charge.
>>>[I mean That is an increase in there and is not a very small base.
>>>[I could emphasize that Nodoka modified the base 25mm design, I do have it specified at about mach 3 in velocity.
>>>[Which itself is a modification of a 0.50in design, using a round designed for heavy machine guns originally.
}While the weapon might be, the 25mm round, in specific, is not a modified 12.5mm. I don't believe that makes sense, as the 12.5mm brass is (unreliably) less than 21mm in diameter to begin with. Most modified (wildcat) rounds with larger diameter are a necked case (like the .50 BMG) with the neck cut off to make a straight walled case. When you start changing base diameter, you're not modifying anymore - you might as well then say it's based on a 9mm or a .380 auto or every other similar case ever made. The M2 Browning was also specifically not a sniper weapon. A Barret light .50 and some other weapons are.
[I never said the ammunition was.
}Mach 3, or about 1000m/s, is about right for most major rifle/cannon calibers, and is about the same as .50 BMG.
[Yes and?
>>>[There's also her totally custom 17mm rounds.
} 25x59mm
}www.smallarmsreview.com/pdf/payload.pdf reports ballistic coefficient inferior to .50 BMG - for a short round, that makes sense. I'll assume Nodoka's is equal to a .510" Hornady 750gr A-Max. (
http://www.varminthunters.com/tech/vmax.html) for 1.05
}Using
http://www.eskimo.com/~jbm/calculations/traj/traj.html for calculations.
}Range from Sveltana to Usagi, first round, ~1500 yards. Range from Morgan to Sveltana, first round, >2000 meters.
}Let's assume by some miracle the wind averages out to only 10km/hr at a 45 degree angle, and the scope is zeroed at 1500 yards
}2000 yards: velocity at target is down to 502m/s, flight time of 2.5 seconds, and the round dropped 30 feet in the last 500 yards. The light wind assumed also blew the round 5 feet.
}Range from Morgan to Sveltana, second round, 3500 meters. Reported time of flight, 3 seconds. Reported muzzle velocity, Mach 3 (~900m/s - we won't bother with atmosphereic pressure and temperature)
}This calculator doesn't go beyond 3000 yards, but at only 3000 yards range, velocity is down to 349m/s, flight time is 4.8 seconds, and the bullet dropped 183 feet from where it was at 1500 yards. The light wind assumed blew the bullet 13 feet. The bullet also dropped some 70 MOA, which is at or near the limit of almost all scopes capability to adjust. Much more importantly, in another few yards, the bullet goes subsonic, almost certainly tumbles, and is therefore inaccurate - once your bullet drops through the sound barrier, you're accuracy is gone.
Use the links, play with the numbers, or search for 'external ballistics' for other calculators.
[Why?
[You're completely wrong on the bullet.
[It isn't necked down to 50.
[Morgan's gun is based on an actual 25mm sniper rifle.
[that 25mm is the actual diameter of the bullet itself.
>>>[Well we are talking about Morgan's weapon here. And while a M2 has been used in a sharp shooter role.
>>>[It's better for Morgan to use a purpose built sharpshooter weapon, which has better accuracy. Key for her role.
>>>[And speaking of the Ma-Deuce. Morrison was using that weapon, and length not weight was why she did not like it.
>>>[Which is similar in weight to those cannon.
}The M2 machine gun is about or under half the weight of the cannon - kg vs. pounds , I suspect.
[I didn't say it was the same weight.
[my point was that it was a lighter weapon.
}Yes, a purpose built weapons is better for a sniper - but the round selection could have been more to their advantage.
[Then if this conversation is about a weapon for Morgan it is moot.
}Note that there's a massive difference here between vehicular and human rounds. The 25x59mm likely has a ~40 gram projectile. The 30x165mm projectiles are in the ~400 gram range, and as I recall, the HEI round for the 30x165mm has about 48 grams of filler (explosive + incendiary). 30x165mm are still in the 900m/s ballpark, until you get into the APDS and aftermarket rounds, which can be higher, I believe.
[Actually From the site detailing info on the XM-109
[[
The centerpiece of the XM-109 system is the 25mm HEDP ammunition it fires. A scaled down derivative of the low velocity 30mm HEDP M789 ammunition fired by the AH-64 Apache attack helicopter, the MX-109's 25mm ammunition has been judged to be 2.5 times more effective at destroying targets than a .50 caliber armor-piercing round. It is expected that this ammunition can penetrate nearly 40mm (an inch and a half) of armor plating at 500 meters, or blast open doors from around the corner. In other words, it gives the Soldier breaching capability on fortified positions, while minimizing exposure to enemy fire, thanks to its effectiveness at greater distances.
]]
[So again. I have no idea what you're trying to say.
>>>[Now succubae can carry such cannon, but the concern is that the kick would nock them off their feet, and the succubae would have to go prone to use them. Which doesn't totally negate their use.
>>>[Morrison being able to stand while using an M2 is "almost" possible, a larger weapon and not at all.
}Sitting position, perhaps. And prone only is just fine for a sniper weapon.
}A good point about recoil - momentum is always, always conserved.
[Again. Morgan would be using a purpose built sniper weapon.
[You're clinging into that idea like a terrier
>>>[the M2 is also not ideal for her. An XM312 or XM307 may be better.
>>>[Or the 17mm weapon that Nodoka is having built.
>>>[But the M2 is what they had and it was relatively easy to modify for use.
>>>[Strength is one factor, build and ergonomics are another.
>>>[That's why the planned design is a 17mm in a bullpup configuration to make a more compact weapon better suited for urban warfare.
>>>[Those vehicle-borne weapons are a bit under 2m in length.
>>>[Morgan is okay with a long gun given her role (1.57m long), and as stated a vehicle type weapon isn't quite right for her role.
>>>[Yes, succubae are designed to carry prey or young when flying. A rough statistic is they can carry another grown person with... trouble. See the chapter where each succubus took another person out with them when their helicopter was hit.
}Ok, so the vehicle cannon would be in the 'trouble' range, while the 25x59 is in the 'child-weight' range.
[Child weight?
>>>[Like any other flying thing, saving even a bit of weight helps. Though it's less load and more mobility.
}Makes sense.
>>>[With most things a more powerful succubus can do more, and age roughly correlates to power.
>>>[Not sure if conversion has an influence here.
>>>[That's it to a T.
>>>[Succubae are more agile and maneuverable, and bulkier armor negates that.
>>>[
}Bulk I can see.
[Bulk and weight are connected by density
} v3a comments:
}still has the 'from the heavens'
[huh
}'Pulling the trigger, Morgan frowned, preferring to take the sniper herself.' - 'and would have preferred to take...' - preferring implies she's shooting at the moving sniper at 2km, which is insane, instead of at the still spotter, which is merely improbable.
[No... it doesn't imply that.
[As you said Svetlana is already out of sight, so not a viable shot.
}'The enemy rifle was not invincible, a thick titanium sphere within an armored chest, was protection enough.' - Well, the second comma should be removed, and this makes little sense - Ivanova, at least, didn't have such armor. Side note: steel was still better armor than titanium alloys at the time thickness for thickness. Titanium had weight and corrosion advantages, which would make sense for a cyborg.
[Yes.
}I don't think Sveltana's return fire was delayed solely by the sound of the shot - she'd gone down a floor, which takes several seconds, and that was after she'd heard the shot. Thus, Morgan can't logically determine that isn't sound based, as opposed to a cautious change of position, with solely timing data.
[For which instant? I'm pretty sure Svetlana was on the ground before she heard the shot.
}'while decoding the electromagnetic broadcasts was one level of advanced technology but monitoring every single landline was another.' - 'technology, monitoring'
[ok
}'A thick blue beam arced out,' - arced? On a curve?
[hmm shot out.
}So, at 3.5km away, why was Morgan by far the closest? That seems... odd, given how many succubae there are around, not even counting Company troops.
[Why?
[They could have sent a succubus out a few kilometers in every direction from the start.
[But splitting up their forces like that could have opened them up to being picked off.