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Old 02-07-2018, 11:38 AM   #6
mlangsdorf
 
Join Date: Aug 2004
Location: Austin, TX
Default Re: [Cutting-Edge Armor Design] Real World SCA-legal Armour and Ballistics Armour

Ballistic black knight harness, take 2:
DR 20 polyurea coated light steel armor solid skullcap: 1.4 sqft, WM 0.3, CM 40, CW 1, CC 1, DR 20: 8.4 lbs, $340
DR 5 transparent laminated polycarbonate eyeslits: 0.1 sqft, WM 0.25, CM 50, CW 0.8, CC 5, DR 5: 0.1 lbs, $25
DR 6 hard steel plate neck and face: 1.3 sqft, WM 0.5, CM 3.5, CW 0.8, CC 5, DR 6: 3.15 lbs, $55
DR 20 polyurea coated light steel armor plate over the vitals: 1 sqft, WM 0.3, CM 40, CW 0.8, CC 5, DR 20: 4.8 lbs, $960.
DR 12F/6B hard steel plate torso other than vitals: 6 sqft, WM 0.5, CM 3.5, CW 0.8, CC 5, DR 9 (average for calculating cost/weight): 21.6 lbs, $380
DR 8F/4B hard steel plate arms, legs: 10.5 sqft, WM 0.5, CM 3.5, CW 0.8, CC 5, DR 6 (average for calculating cost/weight): 28.35 lbs, $500
DR 4 hard steel plate hands, feets: 1.4 sqft, WM 0.5, CM 3.5, CW 0.8, CC 5, DR 4: 2.25 lbs, $40
DR6 improved kevlar undersuit: 21.35 sqft, WM 0.08, CM 120, CW 1, CC 1, DR 6: 10.25 lbs, $1230

Total is 78.9 lbs, $3530. A little over weight and budget, but the protection is good. The important parts are completely resistant to 7.62mm rounds and the arms and legs are nearly resistant to 5.56mm rounds from the front. You can stand in a fire for 45 seconds without worrying about burning or heat. The biggest weak point is the eye slits at DR 5.

against bullets and axes (-4 DR against other damage types)
DR 26 over the skull and vitals, DR 21 over the rest of the front torso, DR 15 over the face and neck, DR 14 over the arms and legs from the front, DR 10 for the hands and feet and back of the limbs, DR 12 for the back torso.

An obvious way to save weight would be to replace the steel on the limbs with aluminum, but at 3.5x the cost of hard steel, it wasn't feasible for the $3000 budget. Dropping the limb armor down to DR4, front and back, would also save about 10 lbs and DR 10 is sufficient to stop 9mm bullets.

At the upper level of protection, titanium composite is 40% the weight of hard steel but 30x as expensive. Using titanium composite for the limbs would drop the weigh by 17 lbs, but would raise the cost by over $14000, so it's not really feasible.
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