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Rigid, Hydrogen Based, Moored Balloon

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GTeclips
#1
Oct9-13, 04:42 PM
P: 23
Hello.

I've regained a certain interest in lighter-than-air-craft recently. To satisfy this interest, I wish to construct a small, rigid, unmanned, moored, hydrogen balloon within the bounds of reason. I'm most definitely not an engineer to any extent, and as such, I have many questions.

First, is hydrogen too dangerous to even consider as a lifting gas in a tethered balloon? I realize hydrogen is looked down upon as a lifting gas for obvious reasons, but the fact is, many airship designs safely used it. Take zeppelins for example, of course there is the tragic Hindenburg (of which a source of ignition has not been determined, so I would not like it mentioned any further), and many early zeppelins met a flaming end, but many sophisticated hydrogen based designs safely transported passengers all around the world, both commercially and militarily.

Second question, which ties with the first, is hydrogen a legal lifting gas in the United States? Are there separate regulations for manned and unmanned balloons? Also, are there any FAA regulations for unmanned tethered balloons? There were not any that I could find.

Third, is a rigid tethered balloon even practical? This may sound like a foolish idea, but it would be used for experimental purposes. If it were within the bounds of reason, what might the frame look like (i.e. material, and wire size.)

Fourth, what is the buoyancy of hydrogen, assuming 100-1,000 meters above sea level and average equatorial air pressure and temperature. If what I hear is truth, this should be around 1.1 kg per cubic meter (or 0.075 lb. per cubic foot.)

Finally (thank you for sticking with me thus far), what material might the envelope be made of, and how could I stitch it together with hydrogen proof seams? I hear that neoprene might suite this purpose well.

Once again, thank you for reading through this mass of questions.
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AlephZero
#2
Oct9-13, 08:16 PM
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Quote Quote by GTeclips View Post
Also, are there any FAA regulations for unmanned tethered balloons? There were not any that I could find.
What regulations apply wlll depend on what altitude it is flying at, how big it is, and what might happen to it if the tether breaks. If there is any chance that it will get into controlled airspace, the "authorities" will most definitely be interested in it!

Talk to air traffic control at your nearest airfleld, or to a local flying club.

I'm not in the US so I don't know the specific regulations, but I would guess you can do pretty much what you like with a small balloon below say 500 ft, so long as you stay a few miles away from airfields. Even then, you might need to notify somebody when and where you plan to fly it.
GTeclips
#3
Oct9-13, 08:22 PM
P: 23
Thank you very much, that clears that issue.

AlephZero
#4
Oct9-13, 08:48 PM
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Rigid, Hydrogen Based, Moored Balloon

The relevant section of the FAA regs is part 101. http://www.chem.hawaii.edu/uham/part101.html


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