50,914,285 cubic feet of space to lift 500 tons
180 foot width of main cylinder (90 radius)
2000 foot length of main cylinder
Craft is lifted by hot air in rigid hold heated by solar panels, ram air turbine power, and/or hydrogen fuel cells
engines powered from same power sources
It is assumed but not verified that to cruise at Flight Level 250, 100 tons of lifting capacity will be lost due to lower pressure. This may be too low or two high of an estimate (verify). Actually, this needs to be verified, but as hot air lifts in the atmosphere, you need only have the air temperature in the envelope be a suitable number above the outside air temperature to create suitable lift.
Decks are integrated at the bottom of the hull.
Aiming for:
• maximum altitude of FL250 to be able to avoid weather
• ability to pressurize all or part of passenger cabins for higher altitude cruising
• 100-120 knots cruising speed
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