M113 APC

[nuke11]

Here are the specs as known.

I wish I could find the website again to give the author full credit. [ATTACH]3452[/ATTACH]

The armor thickness and angles are given.

This doesn't include various armor bolt additions that make the M113A3 tougher though denying the amphibious capabilities in most cases.

The website looks like : http://afvdb.50megs.com/usa/m113.html

[ArmySGT.]

The website looks like : http://afvdb.50megs.com/usa/m113.html

You're right. I saw that not long after I posted the link was in this thread. I have a bunch of M113 links and data saved in a folder for my eventual write up of hit tables.

[ArmySGT.]

For those doing this in Excel the formula is : =38/(COS(RADIANS(45))) = 53.74011537

Excel uses Radians instead of Degrees for COS, it does not do COSD like a calculator.

Updated our favorite spread sheet with the slope VS thickness formula.

morrow_ex.xlsx

Next I will have to come up with a rational way to include the armor material into the formula. For right now the PD can work that out with the tables. Right now I think 1mm Armor plate equals AC 1 and 2.54 cm equals AC 48

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 - - -

[ArmySGT.]

Hmmmmmmm I am fumbling drop down lists and hyperlinks across spread sheets.... Haven't been called upon to do that in a long time....

I'll get it...... Here is the current sordid mess..... Ha!

morrow_ex.xlsx

[ArmySGT.]

Ahhhhhhhhh Progress...... Armor material drop down complete.

Next Armor Value drop downs. for Equivalencies of Steel, Wood, Concrete, and Stone.

Then to bring those values together in a formula to create an adjusted armor value solution.

Have to think on that..... I don't do this very often.

morrow_ex.xlsx