Board Thread:Theories and Speculation/@comment-25093611-20160304230401/@comment-734582-20160310183958

GreatestSin wrote: ^but the amount of chakra is still possible for normal shinobi at least they could do it for some time, Call me crazy but i did the math.

To walk on water you'd need to blast out 125L water per second, at 22km/h. this takes 5Kw. for reference: 5KW is a small engine like a lawn mower.

To walk on air, you'd need to blast out 4.3kg (3.6m^3/s per second at 650 km/h. this takes 141Kw. for reference: 141KW is roughly what a station wagon engine has.

10 MJ is about your daily intake, so you could maintain walking on water for about half an hour and on air for about 73 seconds.

So i was a bit off. (it's 30x as much power). The size of the foot remains the same, which is the area where the chakra is blasted through to create the jet. The densities are known, so this determines the mass flow. A smaller foot (at equal size) requires more power but needs to displace less fluid.

The air jet is within acceptable margins to leave out sonic effects, so the math should be fairly accurate. It ignores more complex things, but it's fine as an estimate.

Conclusions and remarks:
 * it should be possible to move through the air, Iron-man style.
 * it would cost about 30x as much power as walking on water
 * it would be loud as hell
 * it would probably be insanely difficult to control, and would take up a ninja's full concentration to use.

But there's more:
 * ninja of Chunin or above could probably use the technique to maneuver mid-air.
 * If walking on water really costs so little energy, Chunin/Jonin Ninja use up more than a dozen time the daily intake of food. Naruto's insane appetite isn't so insane.

and lastly: The water-walking training was mentioned as being similar to tree-walking. However, tree-walking uses chakra to bind one to a surface, whereas Water Walking is more of a rocket thing. This is why i assumed it worked like i did earlier.