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Re: I found the food numbers!

> Now we found that rations for field troops or explorers weighed about 2.2
>kilos per day (.8 tons per year) and dehydrated could be a lot less.  But
>over all; 36 tons per person is about 21 years of food mass at their 1.67
>tons per year, or 45  food years at our .8 tons per year.  I'm not even
>going to bother with freeze dried numbers.  We won't want to be out that
>long!  Even if you assume no soil.  The mass is still 14 tons per person.
>Which comes to 8.38 year of 1.67 tons per year food years, or 17.5 years at
>our .8 tons per year.  Then I realized that the farm design required
>doubling the internal volume of the hab centrifuge. Which would add another
>20 to 230 tons per person!  (the latter if you shielded the farm

Would stored food need no protection against radiation? I'm not sure how
much  and if the food would become radioactive. But if it does, it may need
shielding too.

>Oh, while on the topic of Mass.  The drive system people seem to be going
>through hoops to build a huge, high efficiency (relativistic exhaust)
>engine to keep the necessary reaction mass amounts down to grams per day.
>I would suggest that if we aren't going to recycle our -- ah-- food by
>products.  The crew will be providing a few tons of usable mass per day.
>Dehydrate, incinerate to plasma or ionize, and pump it into the
>accelerator.  With an electro-magnetic accelerator (as apposed to a thermal
>rocket) the type of mass used is unimportant, and for ship design purposes
>using the same stored mass to feed the crew and drive system is very
>elegant and efficient.

Using all these different kinds of atoms would not be very efficient and
probably impossible. Accelerators work best if only one kind of particle
(depending on mass & charge) is used.