Human Powered Flight

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People could actually fly in the relatively low gravity of the moon, with strap on wings.

This would require a large pressurized volume. A lunar base might not have enough volume at first. But an underground lava tube type habitat probably would.

When people are ready to produce about 160,000 cubic meters of sintered regolith brick and use it with appropriate reinforcing bars to build a suitable dome, then they should be able to produce a flying track on the moon. The dome should be of cylindrical cross section like a quonset hut but with a 100 foot span of the arch and extend 2000 feet down the axis of the arch in a figure eight pattern with the building crossing over itself being carried on a ramp up to an arch where the upper floor crosses over the lower floor. A six meter thick roof of sintered brick should hold in one atmosphere pressure by its weight so it would not need to have anchors holding it down at its base and the roof would not be under tension. Lunar regolith is about one and a half times as dense as water and the sintering process would add to its density. A metal liner for the dome could hold the internal atmosphere that would otherwise seep through porous sintered brick.

To test the popularity of a flying track, one could be built on Earth. The specifications of the track would be somewhat different. Internal pressure in the figure eight dome would be a quarter percent higher than the atmospheric pressure outside to hold up the gas tight fabric roof. The gas inside should be 88% octafluoropropane by volume, 21.96% oxygen, and 0.04% carbon dioxide. This heavy gas mixture would allow other people than top condition athletes to fly human powered aircraft because it is six and a quarter times as dense as air. The octafluoropropane is something used in some medical test procedures such as ultra sound imaging. So, it is unlikely to have serious toxic effects. People who use the flying track would need to breath ordinary air for a while in a transition chamber to get the octafluoropropane removed from their systems. The gas would be passed through a counter current heat exchanger to a cold trap at minus 45 degrees centigrade. This would remove the octafluoropropane to recycle it and prevent it from getting loose in the atmosphere of Earth as a contaminant. The cold trap would also remove carbon dioxide and water vapor, so, scrubbed gas would be saved a pure oxygen and people would be provided with fresh air instead. When people have the octafluoropropane removed from their systems they will no longer sound like demons as they did while using the track.