289
Magnet rule (lemmy.world)
submitted 2 years ago by to c/196@lemmy.blahaj.zone
83 comments fedilink hide all child comments
 
you are viewing a single comment's thread
view the rest of the comments
[–] 5 points 2 years ago (1 child)

A boat with a fan on it can work, because that air bounces off the sail and ends up going backward

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •
  • [–] 5 points 2 years ago (1 child)

    In that way it does not. You can move a boat wirh a fan if you use it to blow the air away from the boat to create thrust like a plane. If you direct the fan onto the sail the force of the forward motion will be canceled out by the backwards thrust (if the sail has 100% efficiency which it does not)

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •
  • [–] 3 points 2 years ago*

    Blowing a fan into the sail does work; but it's nowhere near as efficient as normal airboats. You're not gonna move very fast, and it takes a helluva lot of force just to go like 1/16 the speed you could if you just point the fan behind you.

    The magnet thing might work the same way; but you'd need a super powerful magnet. Like probably an electromagnet. And at that point, an electric engine is just a more efficient use of the energy.

  • permalink
  • fedilink
  • source
  • parent