yup. Finally decided on doing some calculations to support (or disprove) my helium expierment. Turns out, the Helium would provide a grand total of..........
drumroll, please.....
...... 1.6 ounces of bouyant force. (assuming a 36.1L dude, molecular mass of air to be 29g/m, STP, etc.) That's not even including the weight of the Helium itself.
I agree on not using Hydrogen....it would also not get anywhere near enough bouyant force to lift the dude, as well as being dangerous (I got my data from a somewhat *biased* source

)
To get back on-topic, I would suggest not launching the dude under larger power than a D if there is any wind. A small wind gust could bend the *fragile* airframe, and everything would go to heck in a handbasket.