Apollo missions

In Heinlein short story, The Menace From Earth, Lunar colonists have pressurized a huge cave, and use artificial wing to fly, not glide, through the air, as a sport.

Do-able?

Probably. There are certainly Earthly animals that fly by flapping wings, that weigh more than 1/6 the weight of a human, and we’d have the edge over such birds, in that we have more muscle than them. And there are also, here on Earth, human-powered aircraft, though those all use some sort of propeller for propulsion, not the less-efficient flapping wings.

Try extrapolating from here: the mighty Quetzalcoatlus. Probably the biggest biest to ever fly on Earth. Nobody is sure how much it weighed, perhaps only 120 pounds, perhaps 600.

The weight of the American spacesuit was 96.2 kilograms and, for example, Neil Armstrong’s body weight at the time of the lunar mission was 77 kilograms. Accordingly, we get the total weight of a person with a spacesuit 173.2 kilograms. Acceleration of gravity on the Moon g ≈ 1.6 (N / kg). The weight of astronaut Neil Armstrong on the Moon was ~ 277.12 N, the weight of astronaut Neil Armstrong on Earth was ~ 1,697.36 N. Now it becomes clear that Neil Armstrong felt about 6 times lighter compared to his weight on Earth. And according to his feelings, the mass should have corresponded to about ~ 29 kilograms on the Moon, but even with 29 kg it would be difficult to jump with the mentioned high.

I was taught many years ago that when using physicsy language, “kilogram” is mass, not weight. It can be important. For the astronauts, I guess it did not take very long to adjust to lunar gravity, but the forces needed to change direction or stop are still the same, and if you throw a sledgehammer that feels like it weighs a sixth of the 4Kg that it did on earth, the other guy is still trying to catch 4Kg of hammer flying at him and the hammer head will crack his helmet just as easily.