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<blockquote data-quote="Man in the Funny Hat" data-source="post: 5213217" data-attributes="member: 32740">For practical purposes, no. However, rocket propulsion comes from expanding gases. If it were resting on its engine bell on the ground and then the engines fired up the expanding gas has to go somewhere or else... The &quot;or else&quot;, I assume, would be to increase the pressure of the gas, exerting greater force against the ground and the bell itself. I think it would then depend on the weight of the rocket itself as to how that would affect the initial acceleration. But, once above a few feet even a Saturn V's F-1 engine would, I assume - no longer have its acceleration affected.&nbsp;I believe that just as it would when sitting on the ground initially the effect would be insignificant. Newtons law would suggest that the rocket doesn't CARE what's behind it - only that the thrust of the engine itself remains constant.&nbsp;My trivia serves me well. There is a little-known (to the general public) phenomenon called ground effect.<a href="http://en.wikipedia.org/wiki/Ground_effect_in_aircraft" target="_blank">Ground effect in aircraft - Wikipedia, the free encyclopedia</a>When at 1 blade length or lower in altitude a helicopter is subject to ground-effect. But, ground effect has to do with the vortices of air created by wings and especially wingtips which is disrupted at very low heights - only VERY close to the ground. Due to the nature of Ironman's boot propulsion I don't think he would be affected, nor would a rocket.</blockquote>

[QUOTE="Man in the Funny Hat, post: 5213217, member: 32740"] For practical purposes, no. However, rocket propulsion comes from expanding gases. If it were resting on its engine bell on the ground and then the engines fired up the expanding gas has to go somewhere or else... The "or else", I assume, would be to increase the pressure of the gas, exerting greater force against the ground and the bell itself. I think it would then depend on the weight of the rocket itself as to how that would affect the initial acceleration. But, once above a few feet even a Saturn V's F-1 engine would, I assume - no longer have its acceleration affected. I believe that just as it would when sitting on the ground initially the effect would be insignificant. Newtons law would suggest that the rocket doesn't CARE what's behind it - only that the thrust of the engine itself remains constant. My trivia serves me well. There is a little-known (to the general public) phenomenon called ground effect. [URL="http://en.wikipedia.org/wiki/Ground_effect_in_aircraft"]Ground effect in aircraft - Wikipedia, the free encyclopedia[/URL] When at 1 blade length or lower in altitude a helicopter is subject to ground-effect. But, ground effect has to do with the vortices of air created by wings and especially wingtips which is disrupted at very low heights - only VERY close to the ground. Due to the nature of Ironman's boot propulsion I don't think he would be affected, nor would a rocket. [/QUOTE]

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