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Sturgeon's House


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  1. Hello, I was wondering what the "consensus" of this forum was as to the protection efficiency of fuel against long rod kinetic projectiles. I've seen discussion in this thread about the efficiency of fuel against CE threats but the only conclusion of efficiency against KE I remember finding was in one of the tank design submissions where it had a thickness efficiency of 0.1. Is this a reasonable estimate?
  2. Hello (long time lurker), I was wondering how one would calculate the protection provided against long rods by a highly sloped piece of RHA like that found on most modern MBT hull and turret roofs. To this end I have two basic questions. Is it simply the LOS thickness with no shell normalization? https://www.researchgate.net/publication/242632628_THE_PENETRATION_PROCESS_OF_LONG_RODS_INTO_THIN_METALLIC_TARGETS_AT_HIGH_OBLIQUITY This paper makes the following claim about HHS steel angled at 73-77 degrees: "The Mass efficiency (Ef) of the target plates was calculated from the DOP results related to the baseline performance of the rod at the relevant impact velocity. The reference penetration is 95 mm in an RHA block at normal incidence. Based on that, the DOP data indicate Ef in the range of 1.07 to 1.09. That efficiency is mainly related to the obliquity advantage, described above." Would it be reasonable to estimate that non-HH RHA with a greater angle (80-83 degrees) could replicate this mass efficiency? What angle does RHA need to be to deflect/ricochet/shatter/etc. long rods? I've seen papers that seem to have different definitions of "ricochet" and different testing setups (which makes interpretation difficult). I was wondering if this forum has reached any conclusion in this area.
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