Salamand

@Salamand@lemmy.today

• ⁨Comment⁩ on ⁨Anon visits a guy's house⁩ ⁨⁨3⁩ ⁨weeks⁩ ago⁩:

  told my wife and she told her sister

• ⁨Comment⁩ on ⁨Anon isn't fooled by planes⁩ ⁨⁨5⁩ ⁨weeks⁩ ago⁩:

  A common misunderstanding. Boats (made of rock) float due to gravity pushing the water up (as it bounces off the earth). Boats made of feathers (ducks) harness the same principle, as they are also filled with water.

• ⁨Comment⁩ on ⁨Anon isn't fooled by planes⁩ ⁨⁨5⁩ ⁨weeks⁩ ago⁩:

  But… right-side-up, the plane fights gravity, has upward lift, according to Bernoulli principle. And even if we angle the flaps to decrease altitude, it’s still not dropping like a rock, the wings still generate lots of upward lift.

  400 ton plane, wings w 400 ton lift = flight

  Now (before engaging flaps) those same wings upside down would be generating downward “lift” PLUS pull of gravity. So now the 400 ton plane is like an 800 ton plane. Can the flaps alone lift that? Or, said another way, if we gave the plane flat wings, no Bernoulli, and stacked another plane on top of it (to make 800 tons), could it fly right-side-up just using flaps?

• ⁨Comment⁩ on ⁨Anon isn't fooled by planes⁩ ⁨⁨5⁩ ⁨weeks⁩ ago⁩:

  But then how can they fly upside down?