Lewis Goddard
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 Dec 20 accepted How do I figure out the totally airborne height for a given machine? Dec 17 comment How do I figure out the totally airborne height for a given machine? While this does answer the question, with a metaphor that's much easier to visualize, but I was after the points at which the effect is "effectively zero". Specifically, the point at which an aircraft can move over the edge of a cliff and notice no change in performance. As it turns out that appears to be extremely low, as little as a rotor length. Upvoted all the same. Dec 17 comment How do I figure out the totally airborne height for a given machine? I suppose all my googling was for the opposite, for air-only effect, hence I didn't find anything. I'm surprised at the lack of sourceable data for this, although I suppose that could be due to companies treating this as trade secrets. Dec 16 asked How do I figure out the totally airborne height for a given machine? Dec 19 accepted Would an airtight box filled with air act the same way to 1 bar of water pressure as the same box vacuum-sealed at atmospheric pressure? Dec 19 comment Would an airtight box filled with air act the same way to 1 bar of water pressure as the same box vacuum-sealed at atmospheric pressure? So the fact the forces are different do not matter, just the resultant force? Dec 19 comment Would an airtight box filled with air act the same way to 1 bar of water pressure as the same box vacuum-sealed at atmospheric pressure? Do you mean rather than 2-1=1 it would be 1-0=1? The forces are larger, but the resultant is the same? Dec 19 asked Would an airtight box filled with air act the same way to 1 bar of water pressure as the same box vacuum-sealed at atmospheric pressure? Dec 19 revised How do I factor in multiple forces into these Newtonian mechanics equations? Removed unnecessary parts of question, gender neutralized. Jan 18 awarded Scholar Jan 18 accepted How do I factor in multiple forces into these Newtonian mechanics equations? Jan 18 accepted How does the position of lift affect the stability of the lifted object? Jan 11 asked How does the position of lift affect the stability of the lifted object? Jan 11 awarded Supporter Jan 11 answered Do perfect spheres exist in nature? Nov 5 awarded Autobiographer Aug 4 awarded Student Aug 4 awarded Teacher Jul 4 answered How do I factor in multiple forces into these Newtonian mechanics equations? Jul 4 revised How do I factor in multiple forces into these Newtonian mechanics equations? Appended title