GURPS 3e/V2e question: Explosive Reactive Armor weight

Curmudgeon · 11-21-2022, 12:40 PM

I have no idea what you are using for a surface area value, however using fhe surface areas given for Main Battle Tank (TL7) (which is equated to an M1 Abrams) [p. VE141] and the Armor by Facing - Complex Option (p. VE23), I got the following values:

RAP: 400 (turret surface area) * 3/5 (facings) +500 (body surface area) * 3/6 (facings) = 240 sq. ft. (turret) + 250 sq. ft. (body) = 490 sq. ft. * 8 lbs./sq. ft. = 3920 lbs. = 1.78 metric tons.

HRAP: 490 sq. ft. * 90 lbs./sq. ft. = 44,100 lbs. = 20.05 metric tons.

The 90 lbs. for HRAP does seem a bit much. If it is roughly the same density as RAP, it has 11 times the volume of RAP and, if it was scaled up uniformly in all dimensions, would be 2.2 times as large in each dimension. If on the other hand, all that volume is extra thickness, 11 times the thickness probably should do more than just double the DR.

11-21-2022, 12:40 PM	#4
Curmudgeon Join Date: Sep 2011	Re: GURPS 3e/V2e question: Explosive Reactive Armor weight I have no idea what you are using for a surface area value, however using fhe surface areas given for Main Battle Tank (TL7) (which is equated to an M1 Abrams) [p. VE141] and the Armor by Facing - Complex Option (p. VE23), I got the following values: RAP: 400 (turret surface area) * 3/5 (facings) +500 (body surface area) * 3/6 (facings) = 240 sq. ft. (turret) + 250 sq. ft. (body) = 490 sq. ft. * 8 lbs./sq. ft. = 3920 lbs. = 1.78 metric tons. HRAP: 490 sq. ft. * 90 lbs./sq. ft. = 44,100 lbs. = 20.05 metric tons. The 90 lbs. for HRAP does seem a bit much. If it is roughly the same density as RAP, it has 11 times the volume of RAP and, if it was scaled up uniformly in all dimensions, would be 2.2 times as large in each dimension. If on the other hand, all that volume is extra thickness, 11 times the thickness probably should do more than just double the DR. Last edited by Curmudgeon; 11-21-2022 at 12:47 PM.