Glenn Martin's "Jetpack" is actually a retread of a design bruited about in the 1990s called "SoloTrek," which reached the point of untethered brief hovers close to the ground, just as Martin's does. If Martin solved a significant problem afflicting SoloTrek, one does not discover this from the NYT piece,
http://www.nytimes.com/2008/07/29/science/29jetpack.html?_r=1&hp&oref=slogin#
http://graphics8.nytimes.com/images/2008/07/29/us/29jetpack.600.jpg
To see the stalled Springtail (the Solotrek signature craft), which is obviously being hawked to the military, check out:
http://www.trekaero.com/Trek_VTOL_Springtail_EFV4B_Specifications.htm
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