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Correction to: "Deploying dozens of small javelin lunar probes on the
cheap" False! A raw javelin probe of 1 kg, as dropped from 1 km, should impact at roughly 0.8 t (800 kg), well within survival specifications of even toys-R-us, which might not even represent sufficient impact for implanting these lightweight probes. Oops: if I'd only correctly utilized the formula of V squared. 1/2*M*V2 = impact energy or equivalent mass, whereas the V = 1.6 m/s/s From 1 km obviously = 1,600 m/s, squared = 2.56e6 True! 1 kg dropped from 1 km = .5*1e3*2.56e6 = 1.28e3 t (1,280 tonnes impact) Thus a raw javelin probe of 1 kg, as dropped from 1 km, should impact at roughly 1.28e3 t (1,280 tonnes), which might not survive specifications of even the most robust toys-R-us, though obviously accommodating more than sufficient impact capability as for implanting these lightweight probes. The part about the 2 kg package consisting of balloons within balloons, surrounding the 1 kg probe, all of which impacting at 5 km/s is still amounting to 25,000 t. At least this portion is still correct, and I tend to believe the 1000:1 reduction in impact for the probe within this format is also within reason, even though I haven't researched a darn thing as to such impact absorbing packaging. Obviously this delivery method remains way more complicated than the simple "all stop" raw free-for-all drop from 1 km. What caught my attention about this error was in my recalling previous references I'd made to the sorts of damage small and even micro-meteorites can impose upon any lunar EVA, as such open exposure to whatever is incoming is downright pesky if not lethal. As usual, I'll make such mistakes in the future, and even some of my best effort corrections are going to be in error, though at any time others can provide their more correctness and I'll certainly give all the credits possible, which by the way, seems to be far more than our NASA has ever done for you. Regards. Brad Guth / IEIS~GASA |
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