Igloo Space Ship, remainder of viewgraph presentation
3 nov 1998, a zuppero

 VG #2  how big for 100 or 1000 people?  = 100 meter diameter for 150 people  = 215 m,  1900 people  will ice rip and break from the centrifugal force and fly apart? people dumped into space, blood bursting from their eyes; pain torture exploding eardrums; trying to scream, but ho air in their lungs? how much ice?

 VG #3  How much ice?  100 meter diameter ship needs: 8000 tons,   215 m ship: 40,000 tons  That is only 1 zuppmobile shipment per year,    3 zuppmobile per year for the big ship.  How heavy is parachute cloth bag? that is a "Tank"

 VG #4 parachute cloth enveope: how heavy?  Joe Lewis says: polybenzoxazole PBO, 700,000 psi yield strength. density 1.44,   safety factor 2; He would make a 5 mill weave of fine PBO fibers, and then cover the inside with a film layer to keep the water from leaking out.  the bladder tank would be collapsible so one can launch it in a physically compact form.  100 m ship:  water tank bladder weighs 12 tons, fits in 1/2 the Shuttle bay  215 m ship bag weighs  60 tons, launch it instead of the Shuttle  "Shuttle" is only a familiar nominal space vehicle to compares sizes and masses to.  But will space freeze it enough soit will not fly apare?  Do we need to haul a refrigerator inot orbit? Better not, or we are dead.

 VG #5  space refrigerator  At Earth's distance from the sun, a ship coated with Sheldahl Part Number G404300 will cool to -110 Celsius.  This coating is Dupont FPE Teflon on 0.1 micron Silver, on .1 micron nickel. It costs \$1000 per square meter in 1 meter quantities. They can really drop cost for 10,000 square meter orders. They are a relatively small company.  a = .1,  e= .85,  5 mill thick, a/e gives --> -110 Celsius,  -170 Kelvin at 1 A.U.  charts include this mass  We still haven't answered the key question:  will it fly apart?

 VG #6   Ice is Brick when cold.  WONT fly apart. -20 C ice is ok for moon gravity,  -80 C ice is ok for earth gravity
JOE LEWIS's Viewgraphs
joe couldn't make it to meeting, but sent viewgraphs representing some of the Mars mission work on ultra-light tankage.  Using Joe Lewis design methods we believe a 500 to 1 fuel/tank ratio (.2% tankage factor) can be readily achieved. the theoretical limit is more like 10,000 to 1 for a tank that can be completely emptied of water, in a milli-g environment. We would design for 300 milliG (about 2 times gravity).

Other points:
? PBO can do job without ice tensile strength.

digging structures without a drill rig
ice like weak brick
creeps
? don't know how much, at -30 C
? really don't know how much creep at 125 Kelvin, like moon poles and Moons of Jupiter

? pressure just above tripple point,
? so bubbles condense and dissappear

--------------------------------
digging

hot shovel, gets big cakes
hot cynlinder, core drills
hot iron on a rotating mandril, digs whatever your computer says.
collect the vapors
condense the vapors to get water
there should be other things in there too, hard to distill away.

 Ys 700000 psi yield stress of envelope material F 3 1 safety factor for Ys Po 0.1 psi vapor Pressure mass from space G 9.8 m/s^2 max centripital G's Tr 100 g/cm^2 radiation shielding thickness rho_s 1 g/cm^3 density structure rho_b 3 g/cm^3 density envelope mass Vh 92 m^3 volume per human, cubic meters millsgagelim 10 mills gage limit k 1 tube diameter / ship diameter

 Ys 700000 psi yield stress of envelope material F 3 1 safety factor for Ys Po 0.1 psi vapor Pressure mass from space G 9.8 m/s^2 max centripital G's Tr 100 g/cm^2 radiation shielding thickness rho_s 1 g/cm^3 density structure rho_b 3 g/cm^3 density envelope mass Vh 92 m^3 volume per human, cubic meters millsgagelim 10 mills gage limit k 1 tube diameter / ship diameter
 structure mass tons 21.5 46.4 100.0 215.4 464.2 .002 .005 6,018 .01 2,429 16,513 .02 967 6,894 37,185 .05 575 3,750 19,739 96,647 .1 221 1,501 7,994 39,315 187,245 .2 563 3,035 15,001 71,595 336,547 .5 1,039 5,087 24,180 113,463 529,293

 structure mass tons 21.5 46.4 100.0 215.4 464.2 .002 .005 6,018 .01 2,429 16,513 .02 967 6,894 37,185 .05 575 3,750 19,739 96,647 .1 221 1,501 7,994 39,315 187,245 .2 563 3,035 15,001 71,595 336,547 .5 1,039 5,087 24,180 113,463 529,293
 Ys 700000 psi yield stress of envelope material F 3 1 safety factor for Ys Po 0.1 psi vapor Pressure mass from space G 9.8 m/s^2 max centripital G's Tr 100 g/cm^2 radiation shielding thickness rho_s 1 g/cm^3 density structure rho_b 3 g/cm^3 density envelope mass Vh 92 m^3 volume per human, cubic meters millsgagelim 10 mills gage limit k 1 tube diameter / ship diameter
 envelope mass tons 21.5 46.4 100.0 215.4 464.2 .002 .005 9 .01 4 25 .02 1 11 57 .05 1 6 30 148 .1 1 2 12 60 286 .2 1 5 23 109 514 .5 2 8 37 173 808 Number of rooms per person 21.5 46.4 100.0 215.4 464.2 .002 1 1 1 1 1 .005 1 1 1 1 2 .01 1 1 1 1 87 .02 1 1 1 31 648 .05 1 1 24 423 5,320 .1 1 9 155 1,987 22,102 .2 3 54 696 7,805 82,164 .5 23 281 3,090 32,291 329,489 tensile stress required of structure mass psi 22 46 100 215 464 .002 15 33 71 152 329 .005 15 33 71 152 328 .01 15 33 70 151 326 .02 15 32 70 150 323 .05 15 31 67 145 313 .1 14 30 64 138 296 .2 12 26 57 122 263 .5 8 16 35 76 165