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**nuke11** · 08-27-2011, 10:57 AM

I came up with a formula that works. I compared it to the one that Kevin developed and it is bang on.

Explosive DPW Formula
((Explosive weight in kg / 0.563) x 1300) x RE

RE (Relative Effectiveness) Values for Explosive Fillers

PETN: 1.25
RDX: 1.22
Nitroglycerin: 1.12
Composition B: 1.01
Composition A4: 1.01
Composition C4: 1.00
Torpex: 0.94
Tetryl: 0.94
Tetrytol 75/25: 0.90
Amatol 80/20: 0.88
Pentolite: 0.88
Tritonal: 0.83
TNT: 0.75
Explosive D: 0.74
Picric Acid: 0.70
M1 Dynamite: 0.69
Guncotton: 0.69
Dynamite (60%): 0.62
Nitrostarch: 0.60
Gelignite (60%): 0.57
Dynamite (40%): 0.49
Black Powder: 0.41
Mercury Fulminate: 0.38
Ammonium Nitrate: 0.31
Gelignite (40%): 0.31
Lead Azide: 0.29

To convert real world explosive RE values, times it by 0.75 to come up with
The Morrow Project ones.

**ArmySGT.** · 08-27-2011, 01:01 PM

From page 38 3d edition.

The only case in which the E-factor formula is not used is in the case of armor penetrating (shape charged) explosive warheads. In the case of these weapons the E-factor is found by determining how much armor the weapon penetrates. The Armor class of the weapons penetration is taken as that weapons E- factor.

Armor Class

Armor Material Cm of Cm of Cm of Cm of
Class Steel Wood Concrete Stone
A Skin - - - -
B Cloth (Heavy) - - - -
C Leather - - - -
1 13mm light - 2.54 .03 -
Plastic
2 13mm Heavy - 5.08 .5 -
Plastic

3 Chain Mail .25 7.62 .76 -
4 3mm Armor plate .34 10.16 1.06 7.62
5 .42 12.7 1.27 8.89
6 Nylon Body Armor .5 15.24 1.52 -
7 Resistweave Cloth .57 17.78 1.79 -
8 6mm Fiberglass .64 20.32 - -
Plate
9 6mm Aluminium .7 22.86 - -
Plate
10 .76 25.4 3.18 16.51
14 Kevlar Vest
15 1.02 34.29 7.62 22.86
16 19mm Lexan - - - -
18 Fiberglass / - - - -
Titanium Plate
19 13mm Aluminium - - - -
20 1.27 55.88 15.24 36.83
21 3mm Boron Carb- - - - -
ide Ceramic
25 1.52 55.88 15.24 36.83
30 1.79 66.04 19.05 43.18
35 3mm Boron/carbon 2.03 78.74 22.86 49.53
Filament plate
40 - 88.9 29.21 55.88
42 2.29 - - -
45 - 99.06 34.29 60.96
48 2.54 - - -
50 - 109.22 39.37 66.04
55 - 121.92 45.72 71.12
60 - 129.54 50.8 76.2
65 3.18 - - -
82 3.81 - - -
90 4.06 190.5 91.44 106.68
100 4.45 - - -
120 5.08 - - -
160 6.35 - - -
200 7.62 - - -
150 8.89 - - -
300 10.16 - - -
350 11.43 - - -
400 12.7 - - -

Damn table stops at 400

**ArmySGT.** · 08-29-2011, 07:22 PM

Name M72A2 LAW
Cal. 66mm
E-Factor
Wt. (Empty) n/a
Min. Range 50m
Eff. Range 350m
Max. Range 1000m
Burst Radius 5m
Type of Fire Single shot disposable
Rate of Fire Single
Feed Device n/a
Feed Device Wt. n/a
Basic Load 1
Load Wt. 2.37 kg
Total Wt.
Additional Comments: A lightweight, disposable, rocket launcher firing a high explosive warhead. The warheads will penetrate 28 centimeters of steel. The oeback blast from the weapon prevents it from being fired from inside a room smaller than 5x5 meters.

Found in Load out: #1, 9,

RPD-7D Anti-Tank Launcher
E-Factor: 1030
Weight (Empty): 6.8kg
Minimum Range: 30m
Effective Range: 300m
Max. Range: 920m
Type of Fire: Single Shot
Burst Radius: 5m
Round Weight: 2.3kg
Anti-Armor Class: D
Basic Load: 2 rounds

Additional Comments: The RPD-7D is the standard anti-tank launcher of
the Warsaw Pact Forces, although it was beingsuperseded by newer designs like the RPD and RPG-18 by the time the War broke out. The basic design is quite simple and effective, though the round can be pushed off-target by strong crosswinds. This particular version can be disassembled into two parts to shorten the launch tube for the convenience of paratroops.

The RPG-7V is a recoilless, shoulder-fired, muzzle-loaded, reloadable, antitank grenade launcher. It fires a variety of rocket-assisted grenades
from a 40-mm smoothbore launcher tube. It is the standard squad antitank weapon in use by the OPFOR. The RPG-7V is light enough to be
carried and fired by one person. However, an assistant grenadier normally deploys to the left of the gunner to protect him from small arms fire.
The RPG-7V requires a well-trained gunner to estimate ranges and lead distances for moving targets. Crosswinds as low as 7 miles per hour can
complicate the gunner's estimate and reduce first-round hit probability to 50% at ranges beyond 180 meters.

**ArmySGT.** · 08-29-2011, 07:25 PM

Breaching Charges
Thickness of concrete C-4 Needed Wt # of 112 Blocks
.5m or less 3.5 kg 6
.6m 4.8kg 8 Kg of C4 / RE = Weight of explosive substitute
0.8m 9.2kg 17
0.9m 13.2kg 24
1.1m 21kg 38
1.2m 31.5kg 56
1.4m 44.7kg 80
1.5m 48.1kg 86

Relative Effectiveness
Explosive RE
PETN (primercord) 1.24
Nitroglycerine 1.12
C-4 or C-3 1
Picric Acid 0.7
Guncotton 0.69
Dynamite (60%) 0.62
Tetryl 0.93
Amatol 0.87
RDX 0.85
TNT 0.75
Nitostarch 0.6
Dynamite (40%) 0.49
Black Powder 0.41
Ammonium Nitrate 0.31

Explosive Damage Points
Explosive Dpw
M112 C-4 1300
M183 Demolition Charge 20,800
Mk3A2 Grenade 295
M26A1 Grenade 232
Primer cord 10 per M
Blasting Cap 1
M72A2 LAW 533
Armbrust 300 533
M381 HE 40MM 100
M433 HEDP 40mm 120
M25 AP Mine 20
M16A1 AP Mine 888
M56A1 HE 20mm 40
M374A2 HE 81mm 1,240
2.75 in Rocket 2,600
M47 Dragon 3,120
M151E2 TOW 3,120
Stinger 2,900
Chapparal 13,260
Maverick 76,700
M19 AT Mine 20,355
M18A1 Claymore 1,460

**ArmySGT.** · 08-29-2011, 07:29 PM

There's the two light Anti Armor weapons.

Thanks Nuke11 by the way.

As you can see the Writers worked up the E-factor for the RPG-7 for "Final Watch".

Anybody know by what formula as the normal one would not apply for a shape charged weapon.

Next any Idea how they came up with the DPW for the manufactured weapons like the LAW. Its not like the manufacturer was handing out the recipe.

Thanks in advance!

**robj3** · 09-02-2011, 08:58 PM

ArmySGT wrote:

Anybody know by what formula as the normal one would not apply for a shape charged weapon.

E-factor is derived from penetration of armor steel (cm).

There isn't a simple formula. The curve for steel using the table on p.38 is not continuous (plot it in Excel and see).

Only wood has a linear relation between thickness and armor value.

As an approximation for steel:
For each x10 in thickness, x20 armor value.
For each x2 in thickness, x2.5 armor value.

The M72 LAW has a penetration of 28cm or 11".

This gives you an E-factor of about 1100 (1185).

AV 48 = 2.54cm (1") steel.
11" is 11x thicker or ~3.5 doublings.

Final AV = 48 * (2.5^3.5) or about 1185.

Next any Idea how they came up with the DPW for the manufactured weapons like the LAW.

Estimate mass and composition of explosive filler and use the equation Gary posted earlier.

A small simplification:
DPW = 2309 x RE x explosive mass, kg

(1300/0.563 = 2309)

For DPW 533, I get about 270g of RDX (using 0.85 value in TM1-1) which fits
pretty well with the M72 rocket.

**ArmySGT.** · 09-02-2011, 10:30 PM

Thanks Robj3

Getting somewhere now.

**ArmySGT.** · 06-06-2012, 11:28 PM

Originally posted by robj3 View Post

As an approximation for steel:
For each x10 in thickness, x20 armor value.
For each x2 in thickness, x2.5 armor value.

The M72 LAW has a penetration of 28cm or 11".

This gives you an E-factor of about 1100 (1185).

AV 48 = 2.54cm (1") steel.
11" is 11x thicker or ~3.5 doublings.

Final AV = 48 * (2.5^3.5) or about 1185.

It is been so long since I have done algebra I can't even make use of this formula.

This character ^ is stumping me. Google gave me some possibles but come nowhere near the answer of 1185.

**ArmySGT.** · 06-07-2012, 12:32 PM

Wait! Got it.

2.5 to the power of 3.5

Thanks!

Glad I still have a scientific calculator!

**ArmySGT.** · 06-07-2012, 02:03 PM

Name: SD-44 Towed AT Gun Airborne Variant with Aux Propulsion unit.
Cal. 85mm
E-Factor : See by type below.
Wt. (Empty) 3.1 Metric Tons
Min. Range 50m
Eff. Range 1500m
Max. Range
Burst Radius by type
Type of Fire
Rate of Fire 8 RPM with a trained crew / 15 rpm burst for indirect fire.
Feed Device Manual
Feed Device Wt. n/a
Basic Load 21 mixed type
Load Wt. by type
Total Wt.
Additional Comments: Description The 85 mm auxiliary-propelled field gun SD-44 was designed by the F F Petrov design bureau. It is basically the 85 mm Divisional Gun D-44 fitted with an auxiliary propulsion unit: an M-72 two-cylinder petrol engine which develops 14 hp and gives a maximum road speed of 25 km/h. Fuel is carried in one of the trails. The engine is mounted on the left trail and ready use ammunition is carried in the right one. The engine provides power to the two rubber-tyred carriage wheels via a drive shaft and a differential. The conventional steering wheel and steering column are attached to a castor just behind the spades. The lunette is retained enabling the weapon to be towed if required, maximum towing speed is 60 km/h. A two-part folded rammer is mounted vertically on either side of the front of the shield. An infra-red night vision device can be fitted if required. The SD-44 has sometimes been incorrectly called the D-48.

Caliber: 85mm
Name HVAP-T (Hyper Velocity Armor Piercing Tracer)
Soviet Designation: BR-365P/365PK
Maximum range: 1500m
Maximum effective range:
Day: 1150m
Night: Information not available. (INA)
Armor Penetration (mm):
180mm (RHA) at 1,000 meters E-Factor =
113mm (RHA, 30o) at 500 meters E-Factor =

Caliber: 85-mm
Name HEAT-FS (High Explosive Anti-Tank - Fin Stabilized)
Soviet Designation BK-2M
Maximum Range (m): 1500
Max Effective Range (m):
Day: 1500m
Night: INA
Armor Penetration (mm): 300 E-Factor=

Caliber: 85-mm
Name: AP HE (Armor Piercing High Explosive)
Maximum Range (m): 1500
Max Effective Range (m):
Day: 950
Night: INA
Armor Penetration (mm): 91 (30o angle ) at 500 meters E-Factor=

Caliber:85-mm
Name: Frag-HE (Fragmentation High Explosive)
Soviet Designation: O-365K
Maximum Aimed Range (m): 1,500
Max Effective Range (m):
Day: 1,500
Night: INA
Armor Penetration (mm): INA

**ArmySGT.** · 06-07-2012, 02:17 PM

Armor value 48 = 2.54cm of Rolled Homogenous Steel. (RHA)

2.54cm = 25.4mm

Penetration for 85mm HVAP-T is 180mm.

180 divided by 25.4 = 7.086614473

Rounded to 7.087 inches of RHA

7.087 divided by 2.54 = 2.79000558

Rounded to 2.80 doublings from 2.54

AV 48 * (2.54^2.80) = 652.7932332

Rounded to 653.

Efactor for HVAP-T is 653.

Somebody please fact check that as I am unsure. Thanks!

**ArmySGT.** · 06-07-2012, 03:05 PM

Armor value 48 = 2.54cm of Rolled Homogenous Steel. (RHA)

2.54cm = 25.4mm

Penetration for 85mm HEAT-FS is 300mm.

300 divided by 25.4 = 11.81102362

Rounded to 11.811 inches of RHA

11.811 divided by 2.54 = 4.6500093

Rounded to 4.65 doublings from 2.54

AV 48 * (2.54^4.65) = 3661.997299

Rounded to 3662

Efactor for HEAT-FS is 3662.

Nope. Can't be right. I am screwing up the math in figuring how many times a penentration has doubled from the original 2.54 cm.

**ArmySGT.** · 06-07-2012, 06:41 PM

Originally posted by ArmySGT. View Post

Armor value 48 = 2.54cm of Rolled Homogenous Steel. (RHA)

2.54cm = 25.4mm

Penetration for 85mm HEAT-FS is 300mm.

300 divided by 25.4 = 11.81102362

Rounded to 11.811 inches of RHA

11.811 divided by 2.54 = 4.6500093

Rounded to 4.65 doublings from 2.54

AV 48 * (2.54^4.65) = 3661.997299

Rounded to 3662

Efactor for HEAT-FS is 3662.

Nope. Can't be right. I am screwing up the math in figuring how many times a penentration has doubled from the original 2.54 cm.

Armor value 48 = 2.54cm of Rolled Homogenous Steel. (RHA)

2.54cm = 25.4mm

Penetration for 85mm HEAT-FS is 300mm.

300 divided by 10 = 30 centimeters (not inches!)

30 cm divided by 2.54= 11.811023622047244 inches. (Almost a foot!)

Now where I run into a problem. What was doubled and doubled again to reach 11.811023622047244

Time to stop.

**ArmySGT.** · 06-11-2012, 04:28 PM

Originally posted by ArmySGT. View Post

Armor value 48 = 2.54cm of Rolled Homogenous Steel. (RHA)

2.54cm = 25.4mm

Penetration for 85mm HVAP-T is 180mm.

180 divided by 25.4 = 7.086614473

Rounded to 7.087 inches of RHA

7.087 divided by 2.54 = 2.79000558

Rounded to 2.80 doublings from 2.54

AV 48 * (2.54^2.80) = 652.7932332

Rounded to 653.

Efactor for HVAP-T is 653.

Somebody please fact check that as I am unsure. Thanks!

180mm = 18 cm

2.54 ^ 3.1 = 17.9886804 cm

17.9886804 x 48 = 863.4272657

E-factor = 864

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