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<blockquote data-quote="Thornir Alekeg" data-source="post: 5213150" data-attributes="member: 15651">My understanding is that a helicopter works not by downward thrust, but by reducing the air pressure above the rotors in relation to the pressure below the rotors because of the shape and motion of the rotors.&nbsp; It is similar to the way an airplane wing or a sail on a boat work.&nbsp; As a result, passing over a building should have no effect on a helicopter.&nbsp; My assumpmtion is that a rocket would not lose anything significant from being over a hole rather than a platform.&nbsp; It is the energy of the burning mass leaving the rocket that provides the thrust.Trying to think in other terms, I think of the way a hose turned on suddenly will kick back in your hand.&nbsp; If you put it against a surface, it will kick harder, but I think that is because pressure builds up in the hose.&nbsp; The same might happen with a rocket, if it were flush with the surface but as soon as the rocket moves enough to allow that pressure to escape, it is back to the power of the burning fuel providing the energy.</blockquote>

[QUOTE="Thornir Alekeg, post: 5213150, member: 15651"] My understanding is that a helicopter works not by downward thrust, but by reducing the air pressure above the rotors in relation to the pressure below the rotors because of the shape and motion of the rotors. It is similar to the way an airplane wing or a sail on a boat work. As a result, passing over a building should have no effect on a helicopter. My assumpmtion is that a rocket would not lose anything significant from being over a hole rather than a platform. It is the energy of the burning mass leaving the rocket that provides the thrust. Trying to think in other terms, I think of the way a hose turned on suddenly will kick back in your hand. If you put it against a surface, it will kick harder, but I think that is because pressure builds up in the hose. The same might happen with a rocket, if it were flush with the surface but as soon as the rocket moves enough to allow that pressure to escape, it is back to the power of the burning fuel providing the energy. [/QUOTE]

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