A pretty hot (both literally and figuratively) bipropellant rocket could manage about twice the specific impulse, and you could carry somewhat heavier tanks, but two minutes of flight on a rocket pack is probably about the upper limit with conventional propellants.
However, an actual jet pack that used atmospheric oxygen could have an Isp ten times higher, allowing theoretical flights of fifteen minutes or so. Here, it really is a matter of technical development, since jet engines have thrust to weight ratios too low to make it practical. There is movement on this technical front, but it will still take a while.
However, with the MP3 judgment rippling through the world, I'm interested in perhaps moving to a different compression standard. Before I do that, I'd like to ask a question: what lossless format would you recommend for making a digital "master library", which could be (relatively) easily downsampled to a compressed format? Important factors would be true losslessness, filesize (smaller than PCM WAV would be nice), embedded metadata (id3v2-like), existence of automated ripper software, and (to a lesser extent) open-source implementation of such software. Widespread playback implementation of the lossless codec is not an issue for me; the lossless library would likely be burnt to archival DVD media and stored after being downsampling with the chosen compressor.
The reason I ask is this: I've got a 20,000-track re-ripping job ahead of me. I'd like to do that just once, lossless, so that years from now, when I decide to jump from Vorbis to "komprezzor_2039_1337" or whatever, I don't need to drag out the old plastic discs. Thanks!"
After looking at my record on days that I post, it seems I enjoy posting on Tuesday and Thursdays the most. Odd, since one would expect
Lets test this out! Wahoo!