rocky's latest activity
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Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].Yes, those numbers came from the book. The full capacity fuel mass is 2,000,000kg. The dry mass of the ship is described as "around...
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Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].Does this account for the need to slow down? Don’t we need to use the square root of the mass ratio?
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Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].That looks like the Tsiolkovsky rocket equation, which becomes the equation I posted above for a photon rocket when you account for...
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Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].Sorry, I wasn't clear there. That's meant to be the mass ratio for the outbound trip, I just wanted to clarify that it includes...
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Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].Outbound trip. So to recap: ship mass 100,000kg, fuel 2,000,000 kg. Constant acceleration/deceleration at 15m/s^2 over a distance of...
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Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].Yes, sorry I didn’t clarify. R being the mass ratio required for each burn, so R^2 is the mass ratio for the whole trip.
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Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].I’m not sure I understand the question. Doesn’t that equation give the max speed that can be attained with a given mass ratio...
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Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].After reviewing the book a bit, I found the mass of the ship, but now I'm even more confused. The ship weighs 100,000kg, and carries...
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Rrocky reacted to pervect's post in the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary] with
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My gut reaction is that it's unrealistic to believe one can maintain such a high acceleration for such a long time. But that's not... -
Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].Thanks! I couldn't think of any constraint that made sense in the book. I don't believe engine efficiency was mentioned. The way the...
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Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].My proposed plan assumes it can reach the same rapidity as the calculated plan. Basically, I’m wondering why the author proposed a plan...
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Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].Apologies, here is the content of the attachment: Relevant equations: Proper time to travel a given distance at constant acceleration...
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Rrocky replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].My image got compressed beyond readability, so here is the PDF version
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Rrocky posted the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary] in Special and General Relativity.Warning: Minor spoilers for the book Project Hail Mary ahead. A ship has travelled to Tau Ceti (11.9 light years from Earth). The ship...
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