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Problems with Problems With The Orion Spacecraft #9: Stress
In article ,
Tux Wonder-Dog wrote: It also reduces the risk of secondary radiation from the pusher plate. That always bugged me - riding an Orion would be deliberate suicide if you knew beforehand that you were going to receive a massive overdose of radiation every time you increased speed. The smaller Orion designs -- the ones on which the most design detail has been published, and also the ones with the biggest radiation problem -- did generally incorporate a heavily-shielded "powered flight station", at the extreme nose of the vehicle, to which the crew would retreat during engine firings. -- spsystems.net is temporarily off the air; | Henry Spencer mail to henry at zoo.utoronto.ca instead. | |
#62
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Problems with Problems With The Orion Spacecraft #9: Stress
pulse unit *isn't* an omnidirectional device
True, especially in the larger space charges, we have clear information about how they work and the tightly focused shape of the forward plasma. Their backward lobe is unfocused. the pictures and diagrams of the blasts that you photoshop are Rough drafts, we don't have a drawing of the six times less massize http://spacebombardment.blogspot.com...-altitude.html sea level pulse units, so errors like this, at 1.25 seconds, remain to be corrected. http://spacebombardment.blogspot.com...launch_27.html I need to fix the section between the explosion center and the plate to get the focused, rammed, air to the plate sooner, a torroidal fireball seems like a good start. |
#63
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Problems with Problems With The Orion Spacecraft #9: Stress
Henry Spencer wrote: The smaller Orion designs -- the ones on which the most design detail has been published, and also the ones with the biggest radiation problem -- did generally incorporate a heavily-shielded "powered flight station", at the extreme nose of the vehicle, to which the crew would retreat during engine firings. For the 10 meter diameter design, the report (Vol. III) quotes a crew compartment radiation shielding weight of 18,170 kilograms. Pat |
#64
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Problems with Problems With The Orion Spacecraft #9: Stress
Derek Lyons wrote: This [plutonium gun] is the first stage - it's never loaded on the craft, but is fired beneath it as it sits on the launch towers. Thus the size/weight of this unit is not restricted the way the onboard units are. OK, so this reduces one of the drawbacks of using a gun. It doesn't eliminate it, and it still leaves the other drawbacks. Where is the advantage over using implosion, to justify this? From other postings, this sounds like it might have just been a test harness for subjecting a plate to a tiny nuclear explosion. More like a very powerful pulse neutron reactor, with a particularly large burst rod inserted really fast. For that, you want a strong neutron source to ensure predictable predetonation at the moment of first criticality, giving predictable yield. Plutonium would provide both the fissile material and the strong neutron source. With uranium, you would need to add a neutron source to ensure that the system did not go supercritical by an unpredictable amount before the reaction started. No. The designs I've seen to date place a fusion device inside a larger holhraum which focuses the output of the device onto/into the ablative material that provides the thrust. No alterations to the tampers at all. That makes sense. The report that I read was written when this stuff was still classified due to the military projects like Casaba. So it was vague about how the focusing was done, except that it was related to the arrangement of mass around the device. At any rate, if you used a gun with this, you would have the immensely thick barrel to work into your design somehow. |
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